kbn-handlebars dependency update (#613)

* Update kbn-handlebars dependency

* Move handlebars dependency to dev

* Update package

* Update readme

* Update readme

* Ignore legal file

32 files changed, 0 insertions, 6817 deletions

diff --git a/dev/lib/handlebars/LICENSE b/dev/lib/handlebars/LICENSE
deleted file mode 100644
index 5d971a17..00000000
--- a/dev/lib/handlebars/LICENSE
+++ /dev/null
@@ -1,29 +0,0 @@
-The MIT License (MIT)
-
-Copyright (c) Elasticsearch BV
-Copyright (c) Copyright (C) 2011-2019 by Yehuda Katz
-
-Permission is hereby granted, free of charge, to any person obtaining
-a copy of this software and associated documentation files (the
-"Software"), to deal in the Software without restriction, including
-without limitation the rights to use, copy, modify, merge, publish,
-distribute, sublicense, and/or sell copies of the Software, and to
-permit persons to whom the Software is furnished to do so, subject to
-the following conditions:
-
-The above copyright notice and this permission notice shall be
-included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-This software consists of voluntary contributions made by many
-individuals. For exact contribution history, see the revision history
-available at the following locations:
- - https://github.com/handlebars-lang/handlebars.js
- - https://github.com/elastic/kibana/tree/main/packages/kbn-handlebars
diff --git a/dev/lib/handlebars/README.md b/dev/lib/handlebars/README.md
deleted file mode 100644
index 1ec14ef4..00000000
--- a/dev/lib/handlebars/README.md
+++ /dev/null
@@ -1,165 +0,0 @@
-# @kbn/handlebars
-
-A custom version of the handlebars package which, to improve security, does not use `eval` or `new Function`. This means that templates can't be compiled into JavaScript functions in advance and hence, rendering the templates is a lot slower.
-
-## Limitations
-
-- Only the following compile options are supported:
-
-  - `data`
-  - `knownHelpers`
-  - `knownHelpersOnly`
-  - `noEscape`
-  - `strict`
-  - `assumeObjects`
-  - `preventIndent`
-  - `explicitPartialContext`
-
-- Only the following runtime options are supported:
-  - `data`
-  - `helpers`
-  - `partials`
-  - `decorators` (not documented in the official Handlebars [runtime options documentation](https://handlebarsjs.com/api-reference/runtime-options.html))
-  - `blockParams` (not documented in the official Handlebars [runtime options documentation](https://handlebarsjs.com/api-reference/runtime-options.html))
-
-## Implementation differences
-
-The standard `handlebars` implementation:
-
-1. When given a template string, e.g. `Hello {{x}}`, return a "render" function which takes an "input" object, e.g. `{ x: 'World' }`.
-1. The first time the "render" function is called the following happens:
-   1. Turn the template string into an Abstract Syntax Tree (AST).
-   1. Convert the AST into a hyper optimized JavaScript function which takes the input object as an argument.
-   1. Call the generate JavaScript function with the given "input" object to produce and return the final output string (`Hello World`).
-1. Subsequent calls to the "render" function will re-use the already generated JavaScript function.
-
-The custom `@kbn/handlebars` implementation:
-
-1. When given a template string, e.g. `Hello {{x}}`, return a "render" function which takes an "input" object, e.g. `{ x: 'World' }`.
-1. The first time the "render" function is called the following happens:
-   1. Turn the template string into an Abstract Syntax Tree (AST).
-   1. Process the AST with the given "input" object to produce and return the final output string (`Hello World`).
-1. Subsequent calls to the "render" function will re-use the already generated AST.
-
-_Note: Not parsing of the template string until the first call to the "render" function is deliberate as it mimics the original `handlebars` implementation. This means that any errors that occur due to an invalid template string will not be thrown until the first call to the "render" function._
-
-## Technical details
-
-The `handlebars` library exposes the API for both [generating the AST](https://github.com/handlebars-lang/handlebars.js/blob/master/docs/compiler-api.md#ast) and walking it by implementing the [Visitor API](https://github.com/handlebars-lang/handlebars.js/blob/master/docs/compiler-api.md#ast-visitor). We can leverage that to our advantage and create our own "render" function, which internally calls this API to generate the AST and then the API to walk the AST.
-
-The `@kbn/handlebars` implementation of the `Visitor` class implements all the necessary methods called by the parent `Visitor` code when instructed to walk the AST. They all start with an upppercase letter, e.g. `MustacheStatement` or `SubExpression`. We call this class `ElasticHandlebarsVisitor`.
-
-To parse the template string to an AST representation, we call `Handlebars.parse(templateString)`, which returns an AST object.
-
-The AST object contains a bunch of nodes, one for each element of the template string, all arranged in a tree-like structure. The root of the AST object is a node of type `Program`. This is a special node, which we do not need to worry about, but each of its direct children has a type named like the method which will be called when the walking algorithm reaches that node, e.g. `ContentStatement` or `BlockStatement`. These are the methods that our `Visitor` implementation implements.
-
-To instruct our `ElasticHandlebarsVisitor` class to start walking the AST object, we call the `accept()` method inherited from the parent `Visitor` class with the main AST object. The `Visitor` will walk each node in turn that is directly attached to the root `Program` node. For each node it traverses, it will call the matching method in our `ElasticHandlebarsVisitor` class.
-
-To instruct the `Visitor` code to traverse any child nodes of a given node, our implementation needs to manually call `accept(childNode)`, `acceptArray(arrayOfChildNodes)`, `acceptKey(node, childKeyName)`, or `acceptRequired(node, childKeyName)` from within any of the "node" methods, otherwise the child nodes are ignored.
-
-### State
-
-We keep state internally in the `ElasticHandlebarsVisitor` object using the following private properties:
-
-- `contexts`: An array (stack) of `context` objects. In a simple template this array will always only contain a single element: The main `context` object. In more complicated scenarios, new `context` objects will be pushed and popped to and from the `contexts` stack as needed.
-- `output`: An array containing the "rendered" output of each node (normally just one element per node). In the most simple template, this is simply joined together into a the final output string after the AST has been traversed. In more complicated templates, we use this array temporarily to collect parameters to give to helper functions (see the `getParams` function).
-
-## Testing
-
-The tests for `@kbn/handlebars` are integrated into the regular test suite of Kibana and are all jest tests. To run them all, simply do:
-
-```sh
-node scripts/jest packages/kbn-handlebars
-```
-
-By default, each test will run both the original `handlebars` code and the modified `@kbn/handlebars` code to compare if the output of the two are identical. To isolate a test run to just one or the other, you can use the following environment variables:
-
-- `EVAL=1` - Set to only run the original `handlebars` implementation that uses `eval`.
-- `AST=1` - Set to only run the modified `@kbn/handlebars` implementation that doesn't use `eval`.
-
-## Development
-
-Some of the tests have been copied from the upstream `handlebars` project and modified to fit our use-case, test-suite, and coding conventions. They are all located under the `packages/kbn-handlebars/src/spec` directory. To check if any of the copied files have received updates upstream that we might want to include in our copies, you can run the following script:
-
-```sh
-./packages/kbn-handlebars/scripts/check_for_upstream_updates.sh
-```
-
-_Note: This will look for changes in the `4.x` branch of the `handlebars.js` repo only. Changes in the `master` branch are ignored._
-
-Once all updates have been manually merged with our versions of the files, run the following script to "lock" us into the new updates:
-
-```sh
-./packages/kbn-handlebars/scripts/update_upstream_git_hash.sh
-```
-
-This will update file `packages/kbn-handlebars/src/spec/.upstream_git_hash`. Make sure to commit changes to this file as well.
-
-## Debugging
-
-### Print AST
-
-To output the generated AST object structure in a somewhat readable form, use the following script:
-
-```sh
-./packages/kbn-handlebars/scripts/print_ast.js
-```
-
-Example:
-
-```sh
-./packages/kbn-handlebars/scripts/print_ast.js '{{value}}'
-```
-
-Output:
-
-```js
-{
-  type: 'Program',
-  body: [
-    {
-      type: 'MustacheStatement',
-      path: {
-        type: 'PathExpression',
-        data: false,
-        depth: 0,
-        parts: [ 'value' ],
-        original: 'value'
-      },
-      params: [],
-      hash: undefined,
-      escaped: true
-    }
-  ]
-}
-```
-
-By default certain properties will be hidden in the output.
-For more control over the output, check out the options by running the script without any arguments.
-
-### Print generated code
-
-It's possible to see the generated JavaScript code that `handlebars` create for a given template using the following command line tool:
-
-```sh
-./node_modules/handlebars/print-script <template> [options]
-```
-
-Options:
-
-- `-v`: Enable verbose mode.
-
-Example:
-
-```sh
-./node_modules/handlebars/print-script '{{value}}' -v
-```
-
-You can pretty print just the generated code using this command:
-
-```sh
-./node_modules/handlebars/print-script '{{value}}' | \
-  node -e 'process.stdin.on(`data`, c => console.log(`(${eval(`(${c})`).code})`))' | \
-  npx prettier --write --stdin-filepath template.js | \
-  npx cli-highlight -l javascript
-```
diff --git a/dev/lib/handlebars/__snapshots__/index.test.ts.snap b/dev/lib/handlebars/__snapshots__/index.test.ts.snap
deleted file mode 100644
index b9a8c27e..00000000
--- a/dev/lib/handlebars/__snapshots__/index.test.ts.snap
+++ /dev/null
@@ -1,91 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`Handlebars.create 1`] = `
-HandlebarsEnvironment {
-  "AST": Object {
-    "helpers": Object {
-      "helperExpression": [Function],
-      "scopedId": [Function],
-      "simpleId": [Function],
-    },
-  },
-  "COMPILER_REVISION": 8,
-  "Compiler": [Function],
-  "Exception": [Function],
-  "HandlebarsEnvironment": [Function],
-  "JavaScriptCompiler": [Function],
-  "LAST_COMPATIBLE_COMPILER_REVISION": 7,
-  "Parser": Object {
-    "yy": Object {},
-  },
-  "REVISION_CHANGES": Object {
-    "1": "<= 1.0.rc.2",
-    "2": "== 1.0.0-rc.3",
-    "3": "== 1.0.0-rc.4",
-    "4": "== 1.x.x",
-    "5": "== 2.0.0-alpha.x",
-    "6": ">= 2.0.0-beta.1",
-    "7": ">= 4.0.0 <4.3.0",
-    "8": ">= 4.3.0",
-  },
-  "SafeString": [Function],
-  "Utils": Object {
-    "__esModule": true,
-    "appendContextPath": [Function],
-    "blockParams": [Function],
-    "createFrame": [Function],
-    "escapeExpression": [Function],
-    "extend": [Function],
-    "indexOf": [Function],
-    "isArray": [Function],
-    "isEmpty": [Function],
-    "isFunction": [Function],
-    "toString": [Function],
-  },
-  "VERSION": "4.7.7",
-  "VM": Object {
-    "__esModule": true,
-    "checkRevision": [Function],
-    "invokePartial": [Function],
-    "noop": [Function],
-    "resolvePartial": [Function],
-    "template": [Function],
-    "wrapProgram": [Function],
-  },
-  "__esModule": true,
-  "compile": [Function],
-  "compileAST": [Function],
-  "createFrame": [Function],
-  "decorators": Object {
-    "inline": [Function],
-  },
-  "escapeExpression": [Function],
-  "helpers": Object {
-    "blockHelperMissing": [Function],
-    "each": [Function],
-    "helperMissing": [Function],
-    "if": [Function],
-    "log": [Function],
-    "lookup": [Function],
-    "unless": [Function],
-    "with": [Function],
-  },
-  "log": [Function],
-  "logger": Object {
-    "level": "info",
-    "log": [Function],
-    "lookupLevel": [Function],
-    "methodMap": Array [
-      "debug",
-      "info",
-      "warn",
-      "error",
-    ],
-  },
-  "parse": [Function],
-  "parseWithoutProcessing": [Function],
-  "partials": Object {},
-  "precompile": [Function],
-  "template": [Function],
-}
-`;
diff --git a/dev/lib/handlebars/index.test.ts b/dev/lib/handlebars/index.test.ts
deleted file mode 100644
index ed607db1..00000000
--- a/dev/lib/handlebars/index.test.ts
+++ /dev/null
@@ -1,567 +0,0 @@
-/*
- * Elasticsearch B.V licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-/**
- * ABOUT THIS FILE:
- *
- * This file is for tests not copied from the upstream handlebars project, but
- * tests that we feel are needed in order to fully cover our use-cases.
- */
-
-import Handlebars from '.';
-import type { HelperOptions, TemplateDelegate } from './src/types';
-import { expectTemplate, forEachCompileFunctionName } from './src/__jest__/test_bench';
-
-it('Handlebars.create', () => {
-  expect(Handlebars.create()).toMatchSnapshot();
-});
-
-describe('Handlebars.compileAST', () => {
-  describe('compiler options', () => {
-    it('noEscape', () => {
-      expectTemplate('{{value}}').withInput({ value: '<foo>' }).toCompileTo('&lt;foo&gt;');
-
-      expectTemplate('{{value}}')
-        .withCompileOptions({ noEscape: false })
-        .withInput({ value: '<foo>' })
-        .toCompileTo('&lt;foo&gt;');
-
-      expectTemplate('{{value}}')
-        .withCompileOptions({ noEscape: true })
-        .withInput({ value: '<foo>' })
-        .toCompileTo('<foo>');
-    });
-  });
-
-  it('invalid template', () => {
-    expectTemplate('{{value').withInput({ value: 42 }).toThrow(`Parse error on line 1:
-{{value
---^
-Expecting 'ID', 'STRING', 'NUMBER', 'BOOLEAN', 'UNDEFINED', 'NULL', 'DATA', got 'INVALID'`);
-  });
-
-  if (!process.env.EVAL) {
-    it('reassign', () => {
-      const fn = Handlebars.compileAST;
-      expect(fn('{{value}}')({ value: 42 })).toEqual('42');
-    });
-  }
-});
-
-// Extra "helpers" tests
-describe('helpers', () => {
-  it('Only provide options.fn/inverse to block helpers', () => {
-    function toHaveProperties(...args: any[]) {
-      toHaveProperties.calls++;
-      const options = args[args.length - 1];
-      expect(options).toHaveProperty('fn');
-      expect(options).toHaveProperty('inverse');
-      return 42;
-    }
-    toHaveProperties.calls = 0;
-
-    function toNotHaveProperties(...args: any[]) {
-      toNotHaveProperties.calls++;
-      const options = args[args.length - 1];
-      expect(options).not.toHaveProperty('fn');
-      expect(options).not.toHaveProperty('inverse');
-      return 42;
-    }
-    toNotHaveProperties.calls = 0;
-
-    const nonBlockTemplates = ['{{foo}}', '{{foo 1 2}}'];
-    const blockTemplates = ['{{#foo}}42{{/foo}}', '{{#foo 1 2}}42{{/foo}}'];
-
-    for (const template of nonBlockTemplates) {
-      expectTemplate(template)
-        .withInput({
-          foo: toNotHaveProperties,
-        })
-        .toCompileTo('42');
-
-      expectTemplate(template).withHelper('foo', toNotHaveProperties).toCompileTo('42');
-    }
-
-    for (const template of blockTemplates) {
-      expectTemplate(template)
-        .withInput({
-          foo: toHaveProperties,
-        })
-        .toCompileTo('42');
-
-      expectTemplate(template).withHelper('foo', toHaveProperties).toCompileTo('42');
-    }
-
-    const factor = process.env.AST || process.env.EVAL ? 1 : 2;
-    expect(toNotHaveProperties.calls).toEqual(nonBlockTemplates.length * 2 * factor);
-    expect(toHaveProperties.calls).toEqual(blockTemplates.length * 2 * factor);
-  });
-
-  it('should pass expected "this" to helper functions (without input)', () => {
-    expectTemplate('{{hello "world" 12 true false}}')
-      .withHelper('hello', function (this: any, ...args: any[]) {
-        expect(this).toMatchInlineSnapshot(`Object {}`);
-      })
-      .toCompileTo('');
-  });
-
-  it('should pass expected "this" to helper functions (with input)', () => {
-    expectTemplate('{{hello "world" 12 true false}}')
-      .withHelper('hello', function (this: any, ...args: any[]) {
-        expect(this).toMatchInlineSnapshot(`
-          Object {
-            "people": Array [
-              Object {
-                "id": 1,
-                "name": "Alan",
-              },
-              Object {
-                "id": 2,
-                "name": "Yehuda",
-              },
-            ],
-          }
-        `);
-      })
-      .withInput({
-        people: [
-          { name: 'Alan', id: 1 },
-          { name: 'Yehuda', id: 2 },
-        ],
-      })
-      .toCompileTo('');
-  });
-
-  it('should pass expected "this" and arguments to helper functions (non-block helper)', () => {
-    expectTemplate('{{hello "world" 12 true false}}')
-      .withHelper('hello', function (this: any, ...args: any[]) {
-        expect(args).toMatchInlineSnapshot(`
-          Array [
-            "world",
-            12,
-            true,
-            false,
-            Object {
-              "data": Object {
-                "root": Object {
-                  "people": Array [
-                    Object {
-                      "id": 1,
-                      "name": "Alan",
-                    },
-                    Object {
-                      "id": 2,
-                      "name": "Yehuda",
-                    },
-                  ],
-                },
-              },
-              "hash": Object {},
-              "loc": Object {
-                "end": Object {
-                  "column": 31,
-                  "line": 1,
-                },
-                "start": Object {
-                  "column": 0,
-                  "line": 1,
-                },
-              },
-              "lookupProperty": [Function],
-              "name": "hello",
-            },
-          ]
-        `);
-      })
-      .withInput({
-        people: [
-          { name: 'Alan', id: 1 },
-          { name: 'Yehuda', id: 2 },
-        ],
-      })
-      .toCompileTo('');
-  });
-
-  it('should pass expected "this" and arguments to helper functions (block helper)', () => {
-    expectTemplate('{{#hello "world" 12 true false}}{{/hello}}')
-      .withHelper('hello', function (this: any, ...args: any[]) {
-        expect(args).toMatchInlineSnapshot(`
-          Array [
-            "world",
-            12,
-            true,
-            false,
-            Object {
-              "data": Object {
-                "root": Object {
-                  "people": Array [
-                    Object {
-                      "id": 1,
-                      "name": "Alan",
-                    },
-                    Object {
-                      "id": 2,
-                      "name": "Yehuda",
-                    },
-                  ],
-                },
-              },
-              "fn": [Function],
-              "hash": Object {},
-              "inverse": [Function],
-              "loc": Object {
-                "end": Object {
-                  "column": 42,
-                  "line": 1,
-                },
-                "start": Object {
-                  "column": 0,
-                  "line": 1,
-                },
-              },
-              "lookupProperty": [Function],
-              "name": "hello",
-            },
-          ]
-        `);
-      })
-      .withInput({
-        people: [
-          { name: 'Alan', id: 1 },
-          { name: 'Yehuda', id: 2 },
-        ],
-      })
-      .toCompileTo('');
-  });
-});
-
-// Extra "blocks" tests
-describe('blocks', () => {
-  describe('decorators', () => {
-    it('should only call decorator once', () => {
-      let calls = 0;
-      const callsExpected = process.env.AST || process.env.EVAL ? 1 : 2;
-      expectTemplate('{{#helper}}{{*decorator}}{{/helper}}')
-        .withHelper('helper', () => {})
-        .withDecorator('decorator', () => {
-          calls++;
-        })
-        .toCompileTo('');
-      expect(calls).toEqual(callsExpected);
-    });
-
-    forEachCompileFunctionName((compileName) => {
-      it(`should call decorator again if render function is called again for #${compileName}`, () => {
-        global.kbnHandlebarsEnv = Handlebars.create();
-
-        kbnHandlebarsEnv!.registerDecorator('decorator', () => {
-          calls++;
-        });
-
-        const compile = kbnHandlebarsEnv![compileName].bind(kbnHandlebarsEnv);
-        const render = compile('{{*decorator}}');
-
-        let calls = 0;
-        expect(render()).toEqual('');
-        expect(calls).toEqual(1);
-
-        calls = 0;
-        expect(render()).toEqual('');
-        expect(calls).toEqual(1);
-
-        global.kbnHandlebarsEnv = null;
-      });
-    });
-
-    it('should pass expected options to nested decorator', () => {
-      expectTemplate('{{#helper}}{{*decorator foo}}{{/helper}}')
-        .withHelper('helper', () => {})
-        .withDecorator('decorator', function (fn, props, container, options) {
-          expect(options).toMatchInlineSnapshot(`
-            Object {
-              "args": Array [
-                "bar",
-              ],
-              "data": Object {
-                "root": Object {
-                  "foo": "bar",
-                },
-              },
-              "hash": Object {},
-              "loc": Object {
-                "end": Object {
-                  "column": 29,
-                  "line": 1,
-                },
-                "start": Object {
-                  "column": 11,
-                  "line": 1,
-                },
-              },
-              "name": "decorator",
-            }
-          `);
-        })
-        .withInput({ foo: 'bar' })
-        .toCompileTo('');
-    });
-
-    it('should pass expected options to root decorator with no args', () => {
-      expectTemplate('{{*decorator}}')
-        .withDecorator('decorator', function (fn, props, container, options) {
-          expect(options).toMatchInlineSnapshot(`
-            Object {
-              "args": Array [],
-              "data": Object {
-                "root": Object {
-                  "foo": "bar",
-                },
-              },
-              "hash": Object {},
-              "loc": Object {
-                "end": Object {
-                  "column": 14,
-                  "line": 1,
-                },
-                "start": Object {
-                  "column": 0,
-                  "line": 1,
-                },
-              },
-              "name": "decorator",
-            }
-          `);
-        })
-        .withInput({ foo: 'bar' })
-        .toCompileTo('');
-    });
-
-    it('should pass expected options to root decorator with one arg', () => {
-      expectTemplate('{{*decorator foo}}')
-        .withDecorator('decorator', function (fn, props, container, options) {
-          expect(options).toMatchInlineSnapshot(`
-            Object {
-              "args": Array [
-                undefined,
-              ],
-              "data": Object {
-                "root": Object {
-                  "foo": "bar",
-                },
-              },
-              "hash": Object {},
-              "loc": Object {
-                "end": Object {
-                  "column": 18,
-                  "line": 1,
-                },
-                "start": Object {
-                  "column": 0,
-                  "line": 1,
-                },
-              },
-              "name": "decorator",
-            }
-          `);
-        })
-        .withInput({ foo: 'bar' })
-        .toCompileTo('');
-    });
-
-    describe('return values', () => {
-      for (const [desc, template, result] of [
-        ['non-block', '{{*decorator}}cont{{*decorator}}ent', 'content'],
-        ['block', '{{#*decorator}}con{{/decorator}}tent', 'tent'],
-      ]) {
-        describe(desc, () => {
-          const falsy = [undefined, null, false, 0, ''];
-          const truthy = [true, 42, 'foo', {}];
-
-          // Falsy return values from decorators are simply ignored and the
-          // execution falls back to default behavior which is to render the
-          // other parts of the template.
-          for (const value of falsy) {
-            it(`falsy value (type ${typeof value}): ${JSON.stringify(value)}`, () => {
-              expectTemplate(template)
-                .withDecorator('decorator', () => value)
-                .toCompileTo(result);
-            });
-          }
-
-          // Truthy return values from decorators are expected to be functions
-          // and the program will attempt to call them. We expect an error to
-          // be thrown in this case.
-          for (const value of truthy) {
-            it(`non-falsy value (type ${typeof value}): ${JSON.stringify(value)}`, () => {
-              expectTemplate(template)
-                .withDecorator('decorator', () => value)
-                .toThrow('is not a function');
-            });
-          }
-
-          // If the decorator return value is a custom function, its return
-          // value will be the final content of the template.
-          for (const value of [...falsy, ...truthy]) {
-            it(`function returning ${typeof value}: ${JSON.stringify(value)}`, () => {
-              expectTemplate(template)
-                .withDecorator('decorator', () => () => value)
-                .toCompileTo(value as string);
-            });
-          }
-        });
-      }
-    });
-
-    describe('custom return function should be called with expected arguments and its return value should be rendered in the template', () => {
-      it('root decorator', () => {
-        expectTemplate('{{*decorator}}world')
-          .withInput({ me: 'my' })
-          .withDecorator(
-            'decorator',
-            (fn): TemplateDelegate =>
-              (context, options) => {
-                expect(context).toMatchInlineSnapshot(`
-              Object {
-                "me": "my",
-              }
-            `);
-                expect(options).toMatchInlineSnapshot(`
-              Object {
-                "decorators": Object {
-                  "decorator": [Function],
-                },
-                "helpers": Object {},
-                "partials": Object {},
-              }
-            `);
-                return `hello ${context.me} ${fn()}!`;
-              }
-          )
-          .toCompileTo('hello my world!');
-      });
-
-      it('decorator nested inside of array-helper', () => {
-        expectTemplate('{{#arr}}{{*decorator}}world{{/arr}}')
-          .withInput({ arr: ['my'] })
-          .withDecorator(
-            'decorator',
-            (fn): TemplateDelegate =>
-              (context, options) => {
-                expect(context).toMatchInlineSnapshot(`"my"`);
-                expect(options).toMatchInlineSnapshot(`
-              Object {
-                "blockParams": Array [
-                  "my",
-                  0,
-                ],
-                "data": Object {
-                  "_parent": Object {
-                    "root": Object {
-                      "arr": Array [
-                        "my",
-                      ],
-                    },
-                  },
-                  "first": true,
-                  "index": 0,
-                  "key": 0,
-                  "last": true,
-                  "root": Object {
-                    "arr": Array [
-                      "my",
-                    ],
-                  },
-                },
-              }
-            `);
-                return `hello ${context} ${fn()}!`;
-              }
-          )
-          .toCompileTo('hello my world!');
-      });
-
-      it('decorator nested inside of custom helper', () => {
-        expectTemplate('{{#helper}}{{*decorator}}world{{/helper}}')
-          .withHelper('helper', function (options: HelperOptions) {
-            return options.fn('my', { foo: 'bar' } as any);
-          })
-          .withDecorator(
-            'decorator',
-            (fn): TemplateDelegate =>
-              (context, options) => {
-                expect(context).toMatchInlineSnapshot(`"my"`);
-                expect(options).toMatchInlineSnapshot(`
-              Object {
-                "foo": "bar",
-              }
-            `);
-                return `hello ${context} ${fn()}!`;
-              }
-          )
-          .toCompileTo('hello my world!');
-      });
-    });
-
-    it('should call multiple decorators in the same program body in the expected order and get the expected output', () => {
-      let decoratorCall = 0;
-      let progCall = 0;
-      expectTemplate('{{*decorator}}con{{*decorator}}tent', {
-        beforeRender() {
-          // ensure the counters are reset between EVAL/AST render calls
-          decoratorCall = 0;
-          progCall = 0;
-        },
-      })
-        .withInput({
-          decoratorCall: 0,
-          progCall: 0,
-        })
-        .withDecorator('decorator', (fn) => {
-          const decoratorCallOrder = ++decoratorCall;
-          const ret: TemplateDelegate = () => {
-            const progCallOrder = ++progCall;
-            return `(decorator: ${decoratorCallOrder}, prog: ${progCallOrder}, fn: "${fn()}")`;
-          };
-          return ret;
-        })
-        .toCompileTo('(decorator: 2, prog: 1, fn: "(decorator: 1, prog: 2, fn: "content")")');
-    });
-
-    describe('registration', () => {
-      beforeEach(() => {
-        global.kbnHandlebarsEnv = Handlebars.create();
-      });
-
-      afterEach(() => {
-        global.kbnHandlebarsEnv = null;
-      });
-
-      it('should be able to call decorators registered using the `registerDecorator` function', () => {
-        let calls = 0;
-        const callsExpected = process.env.AST || process.env.EVAL ? 1 : 2;
-
-        kbnHandlebarsEnv!.registerDecorator('decorator', () => {
-          calls++;
-        });
-
-        expectTemplate('{{*decorator}}').toCompileTo('');
-        expect(calls).toEqual(callsExpected);
-      });
-
-      it('should not be able to call decorators unregistered using the `unregisterDecorator` function', () => {
-        let calls = 0;
-
-        kbnHandlebarsEnv!.registerDecorator('decorator', () => {
-          calls++;
-        });
-
-        kbnHandlebarsEnv!.unregisterDecorator('decorator');
-
-        expectTemplate('{{*decorator}}').toThrow('lookupProperty(...) is not a function');
-        expect(calls).toEqual(0);
-      });
-    });
-  });
-});
diff --git a/dev/lib/handlebars/index.ts b/dev/lib/handlebars/index.ts
deleted file mode 100644
index 16030445..00000000
--- a/dev/lib/handlebars/index.ts
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- * Elasticsearch B.V licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import { Handlebars } from './src/handlebars';
-import { allowUnsafeEval } from './src/utils';
-
-// The handlebars module uses `export =`, so it can't be re-exported using `export *`.
-// However, because of Babel, we're not allowed to use `export =` ourselves.
-// So we have to resort to using `exports default` even though eslint doesn't like it.
-//
-// eslint-disable-next-line import/no-default-export
-globalThis.Handlebars = Handlebars;
-
-/**
- * If the `unsafe-eval` CSP is set, this string constant will be `compile`,
- * otherwise `compileAST`.
- *
- * This can be used to call the more optimized `compile` function in
- * environments that support it, or fall back to `compileAST` on environments
- * that don't.
- */
-globalThis.handlebarsCompileFnName = allowUnsafeEval() ? 'compile' : 'compileAST';
-
-export type {
-  CompileOptions,
-  RuntimeOptions,
-  HelperDelegate,
-  TemplateDelegate,
-  DecoratorDelegate,
-  HelperOptions,
-} from './src/types';
diff --git a/dev/lib/handlebars/jest.config.js b/dev/lib/handlebars/jest.config.js
deleted file mode 100644
index feb9f905..00000000
--- a/dev/lib/handlebars/jest.config.js
+++ /dev/null
@@ -1,10 +0,0 @@
-/*
- * Elasticsearch B.V licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-module.exports = {
-  preset: '@kbn/test',
-  rootDir: '../..',
-  roots: ['<rootDir>/packages/kbn-handlebars'],
-};
diff --git a/dev/lib/handlebars/kibana.jsonc b/dev/lib/handlebars/kibana.jsonc
deleted file mode 100644
index 59b3c28d..00000000
--- a/dev/lib/handlebars/kibana.jsonc
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "type": "shared-common",
-  "id": "@kbn/handlebars",
-  "owner": "@elastic/kibana-security"
-}
diff --git a/dev/lib/handlebars/package.json b/dev/lib/handlebars/package.json
deleted file mode 100644
index 46ca823a..00000000
--- a/dev/lib/handlebars/package.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "name": "@kbn/handlebars",
-  "version": "1.0.0",
-  "private": true,
-  "license": "MIT"
-}
\ No newline at end of file
diff --git a/dev/lib/handlebars/scripts/check_for_upstream_updates.sh b/dev/lib/handlebars/scripts/check_for_upstream_updates.sh
deleted file mode 100755
index 73f7376a..00000000
--- a/dev/lib/handlebars/scripts/check_for_upstream_updates.sh
+++ /dev/null
@@ -1,45 +0,0 @@
-#!/usr/bin/env bash
-
-set -e
-
-TMP=.tmp-handlebars
-HASH_FILE=packages/kbn-handlebars/src/spec/.upstream_git_hash
-
-function cleanup {
-  rm -fr $TMP
-}
-
-trap cleanup EXIT
-
-rm -fr $TMP
-mkdir $TMP
-
-echo "Cloning handlebars repo..."
-git clone -q --depth 1 https://github.com/handlebars-lang/handlebars.js.git -b 4.x $TMP
-
-echo "Looking for updates..."
-hash=$(git -C $TMP rev-parse HEAD)
-expected_hash=$(cat $HASH_FILE)
-
-if [ "$hash" = "$expected_hash" ]; then
-  echo "You're all up to date :)"
-else
-  echo
-  echo "New changes has been committed to the '4.x' branch in the upstream git repository"
-  echo
-  echo "To resolve this issue, do the following:"
-  echo
-  echo "  1. Investigate the commits in the '4.x' branch of the upstream git repository."
-  echo "     If files inside the 'spec' folder has been updated, sync those updates with"
-  echo "     our local versions of these files (located in"
-  echo "     'packages/kbn-handlebars/src/spec')."
-  echo
-  echo "     https://github.com/handlebars-lang/handlebars.js/compare/$hash...4.x"
-  echo
-  echo "  2. Execute the following script and commit the updated '$HASH_FILE'"
-  echo "     file including any changes you made to our own spec files."
-  echo
-  echo "     ./packages/kbn-handlebars/scripts/update_upstream_git_hash.sh"
-  echo
-  exit 1
-fi
diff --git a/dev/lib/handlebars/scripts/print_ast.js b/dev/lib/handlebars/scripts/print_ast.js
deleted file mode 100755
index b97fb5a6..00000000
--- a/dev/lib/handlebars/scripts/print_ast.js
+++ /dev/null
@@ -1,64 +0,0 @@
-#!/usr/bin/env node
-/*
- * Elasticsearch B.V licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-'use strict'; // eslint-disable-line strict
-
-const { relative } = require('path');
-const { inspect } = require('util');
-
-const { parse } = require('handlebars');
-const argv = require('minimist')(process.argv.slice(2));
-
-const DEFAULT_FILTER = 'loc,strip,openStrip,inverseStrip,closeStrip';
-
-const filter = argv['show-all'] ? [''] : (argv.filter || DEFAULT_FILTER).split(',');
-const hideEmpty = argv['hide-empty'] || false;
-const template = argv._[0];
-
-if (template === undefined) {
-  const script = relative(process.cwd(), process.argv[1]);
-  console.log(`Usage: ${script} [options] <template>`);
-  console.log();
-  console.log('Options:');
-  console.log('  --filter=...  A comma separated list of keys to filter from the output.');
-  console.log(`                Default: ${DEFAULT_FILTER}`);
-  console.log('  --hide-empty  Do not display empty properties.');
-  console.log('  --show-all    Do not filter out any properties. Equivalent to --filter="".');
-  console.log();
-  console.log('Example:');
-  console.log(`  ${script} --hide-empty -- 'hello {{name}}'`);
-  console.log();
-  process.exit(1);
-}
-
-console.log(inspect(reduce(parse(template, filter)), { colors: true, depth: null }));
-
-function reduce(ast) {
-  if (Array.isArray(ast)) {
-    for (let i = 0; i < ast.length; i++) {
-      ast[i] = reduce(ast[i]);
-    }
-  } else {
-    for (const k of filter) {
-      delete ast[k];
-    }
-
-    if (hideEmpty) {
-      for (const [k, v] of Object.entries(ast)) {
-        if (v === undefined || v === null || (Array.isArray(v) && v.length === 0)) {
-          delete ast[k];
-        }
-      }
-    }
-
-    for (const [k, v] of Object.entries(ast)) {
-      if (typeof v === 'object' && v !== null) {
-        ast[k] = reduce(v);
-      }
-    }
-  }
-
-  return ast;
-}
diff --git a/dev/lib/handlebars/scripts/update_upstream_git_hash.sh b/dev/lib/handlebars/scripts/update_upstream_git_hash.sh
deleted file mode 100755
index 52cc39e0..00000000
--- a/dev/lib/handlebars/scripts/update_upstream_git_hash.sh
+++ /dev/null
@@ -1,24 +0,0 @@
-#!/usr/bin/env bash
-
-set -e
-
-TMP=.tmp-handlebars
-HASH_FILE=packages/kbn-handlebars/src/spec/.upstream_git_hash
-
-function cleanup {
-  rm -fr $TMP
-}
-
-trap cleanup EXIT
-
-rm -fr $TMP
-mkdir $TMP
-
-echo "Cloning handlebars repo..."
-git clone -q --depth 1 https://github.com/handlebars-lang/handlebars.js.git -b 4.x $TMP
-
-echo "Updating hash file..."
-git -C $TMP rev-parse HEAD | tr -d '\n' > $HASH_FILE
-git add $HASH_FILE
-
-echo "Done! - Don't forget to commit any changes to $HASH_FILE"
diff --git a/dev/lib/handlebars/src/__jest__/test_bench.ts b/dev/lib/handlebars/src/__jest__/test_bench.ts
deleted file mode 100644
index d17f7f12..00000000
--- a/dev/lib/handlebars/src/__jest__/test_bench.ts
+++ /dev/null
@@ -1,207 +0,0 @@
-/*
- * Elasticsearch B.V licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import Handlebars, {
-  type CompileOptions,
-  type DecoratorDelegate,
-  type HelperDelegate,
-  type RuntimeOptions,
-} from '../..';
-import type { DecoratorsHash, HelpersHash, PartialsHash, Template } from '../types';
-
-type CompileFns = 'compile' | 'compileAST';
-const compileFns: CompileFns[] = ['compile', 'compileAST'];
-if (process.env.AST) compileFns.splice(0, 1);
-else if (process.env.EVAL) compileFns.splice(1, 1);
-
-declare global {
-  var kbnHandlebarsEnv: typeof Handlebars | null; // eslint-disable-line no-var
-}
-
-global.kbnHandlebarsEnv = null;
-
-interface TestOptions {
-  beforeEach?: Function;
-  beforeRender?: Function;
-}
-
-export function expectTemplate(template: string, options?: TestOptions) {
-  return new HandlebarsTestBench(template, options);
-}
-
-export function forEachCompileFunctionName(
-  cb: (compileName: CompileFns, index: number, array: CompileFns[]) => void
-) {
-  compileFns.forEach(cb);
-}
-
-class HandlebarsTestBench {
-  private template: string;
-  private options: TestOptions;
-  private compileOptions?: CompileOptions;
-  private runtimeOptions?: RuntimeOptions;
-  private helpers: HelpersHash = {};
-  private partials: PartialsHash = {};
-  private decorators: DecoratorsHash = {};
-  private input: any = {};
-
-  constructor(template: string, options: TestOptions = {}) {
-    this.template = template;
-    this.options = options;
-  }
-
-  withCompileOptions(compileOptions?: CompileOptions) {
-    this.compileOptions = compileOptions;
-    return this;
-  }
-
-  withRuntimeOptions(runtimeOptions?: RuntimeOptions) {
-    this.runtimeOptions = runtimeOptions;
-    return this;
-  }
-
-  withInput(input: any) {
-    this.input = input;
-    return this;
-  }
-
-  withHelper<F extends HelperDelegate>(name: string, helper: F) {
-    this.helpers[name] = helper;
-    return this;
-  }
-
-  withHelpers<F extends HelperDelegate>(helperFunctions: Record<string, F>) {
-    for (const [name, helper] of Object.entries(helperFunctions)) {
-      this.withHelper(name, helper);
-    }
-    return this;
-  }
-
-  withPartial(name: string | number, partial: Template) {
-    this.partials[name] = partial;
-    return this;
-  }
-
-  withPartials(partials: Record<string, Template>) {
-    for (const [name, partial] of Object.entries(partials)) {
-      this.withPartial(name, partial);
-    }
-    return this;
-  }
-
-  withDecorator(name: string, decoratorFunction: DecoratorDelegate) {
-    this.decorators[name] = decoratorFunction;
-    return this;
-  }
-
-  withDecorators(decoratorFunctions: Record<string, DecoratorDelegate>) {
-    for (const [name, decoratorFunction] of Object.entries(decoratorFunctions)) {
-      this.withDecorator(name, decoratorFunction);
-    }
-    return this;
-  }
-
-  toCompileTo(outputExpected: string) {
-    const { outputEval, outputAST } = this.compileAndExecute();
-    if (process.env.EVAL) {
-      expect(outputEval).toEqual(outputExpected);
-    } else if (process.env.AST) {
-      expect(outputAST).toEqual(outputExpected);
-    } else {
-      expect(outputAST).toEqual(outputExpected);
-      expect(outputAST).toEqual(outputEval);
-    }
-  }
-
-  toThrow(error?: string | RegExp | jest.Constructable | Error | undefined) {
-    if (process.env.EVAL) {
-      expect(() => {
-        this.compileAndExecuteEval();
-      }).toThrowError(error);
-    } else if (process.env.AST) {
-      expect(() => {
-        this.compileAndExecuteAST();
-      }).toThrowError(error);
-    } else {
-      expect(() => {
-        this.compileAndExecuteEval();
-      }).toThrowError(error);
-      expect(() => {
-        this.compileAndExecuteAST();
-      }).toThrowError(error);
-    }
-  }
-
-  private compileAndExecute() {
-    if (process.env.EVAL) {
-      return {
-        outputEval: this.compileAndExecuteEval(),
-      };
-    } else if (process.env.AST) {
-      return {
-        outputAST: this.compileAndExecuteAST(),
-      };
-    } else {
-      return {
-        outputEval: this.compileAndExecuteEval(),
-        outputAST: this.compileAndExecuteAST(),
-      };
-    }
-  }
-
-  private compileAndExecuteEval() {
-    const renderEval = this.compileEval();
-
-    const runtimeOptions: RuntimeOptions = {
-      helpers: this.helpers,
-      partials: this.partials,
-      decorators: this.decorators,
-      ...this.runtimeOptions,
-    };
-
-    this.execBeforeRender();
-
-    return renderEval(this.input, runtimeOptions);
-  }
-
-  private compileAndExecuteAST() {
-    const renderAST = this.compileAST();
-
-    const runtimeOptions: RuntimeOptions = {
-      helpers: this.helpers,
-      partials: this.partials,
-      decorators: this.decorators,
-      ...this.runtimeOptions,
-    };
-
-    this.execBeforeRender();
-
-    return renderAST(this.input, runtimeOptions);
-  }
-
-  private compileEval(handlebarsEnv = getHandlebarsEnv()) {
-    this.execBeforeEach();
-    return handlebarsEnv.compile(this.template, this.compileOptions);
-  }
-
-  private compileAST(handlebarsEnv = getHandlebarsEnv()) {
-    this.execBeforeEach();
-    return handlebarsEnv.compileAST(this.template, this.compileOptions);
-  }
-
-  private execBeforeRender() {
-    this.options.beforeRender?.();
-  }
-
-  private execBeforeEach() {
-    if (this.options.beforeEach) {
-      this.options.beforeEach();
-    }
-  }
-}
-
-function getHandlebarsEnv() {
-  return kbnHandlebarsEnv || Handlebars.create();
-}
diff --git a/dev/lib/handlebars/src/handlebars.ts b/dev/lib/handlebars/src/handlebars.ts
deleted file mode 100644
index 358d1b73..00000000
--- a/dev/lib/handlebars/src/handlebars.ts
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * Elasticsearch B.V licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-// The handlebars module uses `export =`, so we should technically use `import Handlebars = require('handlebars')`, but Babel will not allow this:
-// https://www.typescriptlang.org/docs/handbook/modules.html#export--and-import--require
-import Handlebars = require('handlebars');
-
-import type { CompileOptions, RuntimeOptions, TemplateDelegate } from './types';
-import { ElasticHandlebarsVisitor } from './visitor';
-
-const originalCreate = Handlebars.create;
-
-export { Handlebars };
-
-/**
- * Creates an isolated Handlebars environment.
- *
- * Each environment has its own helpers.
- * This is only necessary for use cases that demand distinct helpers.
- * Most use cases can use the root Handlebars environment directly.
- *
- * @returns A sandboxed/scoped version of the @kbn/handlebars module
- */
-Handlebars.create = function (): typeof Handlebars {
-  const SandboxedHandlebars = originalCreate.call(Handlebars) as typeof Handlebars;
-  // When creating new Handlebars environments, ensure the custom compileAST function is present in the new environment as well
-  SandboxedHandlebars.compileAST = Handlebars.compileAST;
-  return SandboxedHandlebars;
-};
-
-Handlebars.compileAST = function (
-  input: string | hbs.AST.Program,
-  options?: CompileOptions
-): TemplateDelegate {
-  if (input == null || (typeof input !== 'string' && input.type !== 'Program')) {
-    throw new Handlebars.Exception(
-      `You must pass a string or Handlebars AST to Handlebars.compileAST. You passed ${input}`
-    );
-  }
-
-  // If `Handlebars.compileAST` is reassigned, `this` will be undefined.
-  const visitor = new ElasticHandlebarsVisitor(this ?? Handlebars, input, options);
-
-  return (context: any, runtimeOptions?: RuntimeOptions) => visitor.render(context, runtimeOptions);
-};
diff --git a/dev/lib/handlebars/src/spec/.upstream_git_hash b/dev/lib/handlebars/src/spec/.upstream_git_hash
deleted file mode 100644
index 5a6b1831..00000000
--- a/dev/lib/handlebars/src/spec/.upstream_git_hash
+++ /dev/null
@@ -1 +0,0 @@
-c65c6cce3f626e4896a9d59250f0908be695adae
\ No newline at end of file
diff --git a/dev/lib/handlebars/src/spec/index.basic.test.ts b/dev/lib/handlebars/src/spec/index.basic.test.ts
deleted file mode 100644
index 6acf3ae9..00000000
--- a/dev/lib/handlebars/src/spec/index.basic.test.ts
+++ /dev/null
@@ -1,481 +0,0 @@
-/*
- * This file is forked from the handlebars project (https://github.com/handlebars-lang/handlebars.js),
- * and may include modifications made by Elasticsearch B.V.
- * Elasticsearch B.V. licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import Handlebars from '../..';
-import { expectTemplate } from '../__jest__/test_bench';
-
-describe('basic context', () => {
-  it('most basic', () => {
-    expectTemplate('{{foo}}').withInput({ foo: 'foo' }).toCompileTo('foo');
-  });
-
-  it('escaping', () => {
-    expectTemplate('\\{{foo}}').withInput({ foo: 'food' }).toCompileTo('{{foo}}');
-    expectTemplate('content \\{{foo}}').withInput({ foo: 'food' }).toCompileTo('content {{foo}}');
-    expectTemplate('\\\\{{foo}}').withInput({ foo: 'food' }).toCompileTo('\\food');
-    expectTemplate('content \\\\{{foo}}').withInput({ foo: 'food' }).toCompileTo('content \\food');
-    expectTemplate('\\\\ {{foo}}').withInput({ foo: 'food' }).toCompileTo('\\\\ food');
-  });
-
-  it('compiling with a basic context', () => {
-    expectTemplate('Goodbye\n{{cruel}}\n{{world}}!')
-      .withInput({
-        cruel: 'cruel',
-        world: 'world',
-      })
-      .toCompileTo('Goodbye\ncruel\nworld!');
-  });
-
-  it('compiling with a string context', () => {
-    expectTemplate('{{.}}{{length}}').withInput('bye').toCompileTo('bye3');
-  });
-
-  it('compiling with an undefined context', () => {
-    expectTemplate('Goodbye\n{{cruel}}\n{{world.bar}}!')
-      .withInput(undefined)
-      .toCompileTo('Goodbye\n\n!');
-
-    expectTemplate('{{#unless foo}}Goodbye{{../test}}{{test2}}{{/unless}}')
-      .withInput(undefined)
-      .toCompileTo('Goodbye');
-  });
-
-  it('comments', () => {
-    expectTemplate('{{! Goodbye}}Goodbye\n{{cruel}}\n{{world}}!')
-      .withInput({
-        cruel: 'cruel',
-        world: 'world',
-      })
-      .toCompileTo('Goodbye\ncruel\nworld!');
-
-    expectTemplate('    {{~! comment ~}}      blah').toCompileTo('blah');
-    expectTemplate('    {{~!-- long-comment --~}}      blah').toCompileTo('blah');
-    expectTemplate('    {{! comment ~}}      blah').toCompileTo('    blah');
-    expectTemplate('    {{!-- long-comment --~}}      blah').toCompileTo('    blah');
-    expectTemplate('    {{~! comment}}      blah').toCompileTo('      blah');
-    expectTemplate('    {{~!-- long-comment --}}      blah').toCompileTo('      blah');
-  });
-
-  it('boolean', () => {
-    const string = '{{#goodbye}}GOODBYE {{/goodbye}}cruel {{world}}!';
-    expectTemplate(string)
-      .withInput({
-        goodbye: true,
-        world: 'world',
-      })
-      .toCompileTo('GOODBYE cruel world!');
-
-    expectTemplate(string)
-      .withInput({
-        goodbye: false,
-        world: 'world',
-      })
-      .toCompileTo('cruel world!');
-  });
-
-  it('zeros', () => {
-    expectTemplate('num1: {{num1}}, num2: {{num2}}')
-      .withInput({
-        num1: 42,
-        num2: 0,
-      })
-      .toCompileTo('num1: 42, num2: 0');
-
-    expectTemplate('num: {{.}}').withInput(0).toCompileTo('num: 0');
-
-    expectTemplate('num: {{num1/num2}}')
-      .withInput({ num1: { num2: 0 } })
-      .toCompileTo('num: 0');
-  });
-
-  it('false', () => {
-    /* eslint-disable no-new-wrappers */
-    expectTemplate('val1: {{val1}}, val2: {{val2}}')
-      .withInput({
-        val1: false,
-        val2: new Boolean(false),
-      })
-      .toCompileTo('val1: false, val2: false');
-
-    expectTemplate('val: {{.}}').withInput(false).toCompileTo('val: false');
-
-    expectTemplate('val: {{val1/val2}}')
-      .withInput({ val1: { val2: false } })
-      .toCompileTo('val: false');
-
-    expectTemplate('val1: {{{val1}}}, val2: {{{val2}}}')
-      .withInput({
-        val1: false,
-        val2: new Boolean(false),
-      })
-      .toCompileTo('val1: false, val2: false');
-
-    expectTemplate('val: {{{val1/val2}}}')
-      .withInput({ val1: { val2: false } })
-      .toCompileTo('val: false');
-    /* eslint-enable */
-  });
-
-  it('should handle undefined and null', () => {
-    expectTemplate('{{awesome undefined null}}')
-      .withInput({
-        awesome(_undefined: any, _null: any, options: any) {
-          return (_undefined === undefined) + ' ' + (_null === null) + ' ' + typeof options;
-        },
-      })
-      .toCompileTo('true true object');
-
-    expectTemplate('{{undefined}}')
-      .withInput({
-        undefined() {
-          return 'undefined!';
-        },
-      })
-      .toCompileTo('undefined!');
-
-    expectTemplate('{{null}}')
-      .withInput({
-        null() {
-          return 'null!';
-        },
-      })
-      .toCompileTo('null!');
-  });
-
-  it('newlines', () => {
-    expectTemplate("Alan's\nTest").toCompileTo("Alan's\nTest");
-    expectTemplate("Alan's\rTest").toCompileTo("Alan's\rTest");
-  });
-
-  it('escaping text', () => {
-    expectTemplate("Awesome's").toCompileTo("Awesome's");
-    expectTemplate('Awesome\\').toCompileTo('Awesome\\');
-    expectTemplate('Awesome\\\\ foo').toCompileTo('Awesome\\\\ foo');
-    expectTemplate('Awesome {{foo}}').withInput({ foo: '\\' }).toCompileTo('Awesome \\');
-    expectTemplate(" ' ' ").toCompileTo(" ' ' ");
-  });
-
-  it('escaping expressions', () => {
-    expectTemplate('{{{awesome}}}').withInput({ awesome: "&'\\<>" }).toCompileTo("&'\\<>");
-
-    expectTemplate('{{&awesome}}').withInput({ awesome: "&'\\<>" }).toCompileTo("&'\\<>");
-
-    expectTemplate('{{awesome}}')
-      .withInput({ awesome: '&"\'`\\<>' })
-      .toCompileTo('&amp;&quot;&#x27;&#x60;\\&lt;&gt;');
-
-    expectTemplate('{{awesome}}')
-      .withInput({ awesome: 'Escaped, <b> looks like: &lt;b&gt;' })
-      .toCompileTo('Escaped, &lt;b&gt; looks like: &amp;lt;b&amp;gt;');
-  });
-
-  it("functions returning safestrings shouldn't be escaped", () => {
-    expectTemplate('{{awesome}}')
-      .withInput({
-        awesome() {
-          return new Handlebars.SafeString("&'\\<>");
-        },
-      })
-      .toCompileTo("&'\\<>");
-  });
-
-  it('functions', () => {
-    expectTemplate('{{awesome}}')
-      .withInput({
-        awesome() {
-          return 'Awesome';
-        },
-      })
-      .toCompileTo('Awesome');
-
-    expectTemplate('{{awesome}}')
-      .withInput({
-        awesome() {
-          return this.more;
-        },
-        more: 'More awesome',
-      })
-      .toCompileTo('More awesome');
-  });
-
-  it('functions with context argument', () => {
-    expectTemplate('{{awesome frank}}')
-      .withInput({
-        awesome(context: any) {
-          return context;
-        },
-        frank: 'Frank',
-      })
-      .toCompileTo('Frank');
-  });
-
-  it('pathed functions with context argument', () => {
-    expectTemplate('{{bar.awesome frank}}')
-      .withInput({
-        bar: {
-          awesome(context: any) {
-            return context;
-          },
-        },
-        frank: 'Frank',
-      })
-      .toCompileTo('Frank');
-  });
-
-  it('depthed functions with context argument', () => {
-    expectTemplate('{{#with frank}}{{../awesome .}}{{/with}}')
-      .withInput({
-        awesome(context: any) {
-          return context;
-        },
-        frank: 'Frank',
-      })
-      .toCompileTo('Frank');
-  });
-
-  it('block functions with context argument', () => {
-    expectTemplate('{{#awesome 1}}inner {{.}}{{/awesome}}')
-      .withInput({
-        awesome(context: any, options: any) {
-          return options.fn(context);
-        },
-      })
-      .toCompileTo('inner 1');
-  });
-
-  it('depthed block functions with context argument', () => {
-    expectTemplate('{{#with value}}{{#../awesome 1}}inner {{.}}{{/../awesome}}{{/with}}')
-      .withInput({
-        value: true,
-        awesome(context: any, options: any) {
-          return options.fn(context);
-        },
-      })
-      .toCompileTo('inner 1');
-  });
-
-  it('block functions without context argument', () => {
-    expectTemplate('{{#awesome}}inner{{/awesome}}')
-      .withInput({
-        awesome(options: any) {
-          return options.fn(this);
-        },
-      })
-      .toCompileTo('inner');
-  });
-
-  it('pathed block functions without context argument', () => {
-    expectTemplate('{{#foo.awesome}}inner{{/foo.awesome}}')
-      .withInput({
-        foo: {
-          awesome() {
-            return this;
-          },
-        },
-      })
-      .toCompileTo('inner');
-  });
-
-  it('depthed block functions without context argument', () => {
-    expectTemplate('{{#with value}}{{#../awesome}}inner{{/../awesome}}{{/with}}')
-      .withInput({
-        value: true,
-        awesome() {
-          return this;
-        },
-      })
-      .toCompileTo('inner');
-  });
-
-  it('paths with hyphens', () => {
-    expectTemplate('{{foo-bar}}').withInput({ 'foo-bar': 'baz' }).toCompileTo('baz');
-
-    expectTemplate('{{foo.foo-bar}}')
-      .withInput({ foo: { 'foo-bar': 'baz' } })
-      .toCompileTo('baz');
-
-    expectTemplate('{{foo/foo-bar}}')
-      .withInput({ foo: { 'foo-bar': 'baz' } })
-      .toCompileTo('baz');
-  });
-
-  it('nested paths', () => {
-    expectTemplate('Goodbye {{alan/expression}} world!')
-      .withInput({ alan: { expression: 'beautiful' } })
-      .toCompileTo('Goodbye beautiful world!');
-  });
-
-  it('nested paths with empty string value', () => {
-    expectTemplate('Goodbye {{alan/expression}} world!')
-      .withInput({ alan: { expression: '' } })
-      .toCompileTo('Goodbye  world!');
-  });
-
-  it('literal paths', () => {
-    expectTemplate('Goodbye {{[@alan]/expression}} world!')
-      .withInput({ '@alan': { expression: 'beautiful' } })
-      .toCompileTo('Goodbye beautiful world!');
-
-    expectTemplate('Goodbye {{[foo bar]/expression}} world!')
-      .withInput({ 'foo bar': { expression: 'beautiful' } })
-      .toCompileTo('Goodbye beautiful world!');
-  });
-
-  it('literal references', () => {
-    expectTemplate('Goodbye {{[foo bar]}} world!')
-      .withInput({ 'foo bar': 'beautiful' })
-      .toCompileTo('Goodbye beautiful world!');
-
-    expectTemplate('Goodbye {{"foo bar"}} world!')
-      .withInput({ 'foo bar': 'beautiful' })
-      .toCompileTo('Goodbye beautiful world!');
-
-    expectTemplate("Goodbye {{'foo bar'}} world!")
-      .withInput({ 'foo bar': 'beautiful' })
-      .toCompileTo('Goodbye beautiful world!');
-
-    expectTemplate('Goodbye {{"foo[bar"}} world!')
-      .withInput({ 'foo[bar': 'beautiful' })
-      .toCompileTo('Goodbye beautiful world!');
-
-    expectTemplate('Goodbye {{"foo\'bar"}} world!')
-      .withInput({ "foo'bar": 'beautiful' })
-      .toCompileTo('Goodbye beautiful world!');
-
-    expectTemplate("Goodbye {{'foo\"bar'}} world!")
-      .withInput({ 'foo"bar': 'beautiful' })
-      .toCompileTo('Goodbye beautiful world!');
-  });
-
-  it("that current context path ({{.}}) doesn't hit helpers", () => {
-    expectTemplate('test: {{.}}')
-      .withInput(null)
-      // @ts-expect-error Setting the helper to a string instead of a function doesn't make sense normally, but here it doesn't matter
-      .withHelpers({ helper: 'awesome' })
-      .toCompileTo('test: ');
-  });
-
-  it('complex but empty paths', () => {
-    expectTemplate('{{person/name}}')
-      .withInput({ person: { name: null } })
-      .toCompileTo('');
-
-    expectTemplate('{{person/name}}').withInput({ person: {} }).toCompileTo('');
-  });
-
-  it('this keyword in paths', () => {
-    expectTemplate('{{#goodbyes}}{{this}}{{/goodbyes}}')
-      .withInput({ goodbyes: ['goodbye', 'Goodbye', 'GOODBYE'] })
-      .toCompileTo('goodbyeGoodbyeGOODBYE');
-
-    expectTemplate('{{#hellos}}{{this/text}}{{/hellos}}')
-      .withInput({
-        hellos: [{ text: 'hello' }, { text: 'Hello' }, { text: 'HELLO' }],
-      })
-      .toCompileTo('helloHelloHELLO');
-  });
-
-  it('this keyword nested inside path', () => {
-    expectTemplate('{{#hellos}}{{text/this/foo}}{{/hellos}}').toThrow(
-      'Invalid path: text/this - 1:13'
-    );
-
-    expectTemplate('{{[this]}}').withInput({ this: 'bar' }).toCompileTo('bar');
-
-    expectTemplate('{{text/[this]}}')
-      .withInput({ text: { this: 'bar' } })
-      .toCompileTo('bar');
-  });
-
-  it('this keyword in helpers', () => {
-    const helpers = {
-      foo(value: any) {
-        return 'bar ' + value;
-      },
-    };
-
-    expectTemplate('{{#goodbyes}}{{foo this}}{{/goodbyes}}')
-      .withInput({ goodbyes: ['goodbye', 'Goodbye', 'GOODBYE'] })
-      .withHelpers(helpers)
-      .toCompileTo('bar goodbyebar Goodbyebar GOODBYE');
-
-    expectTemplate('{{#hellos}}{{foo this/text}}{{/hellos}}')
-      .withInput({
-        hellos: [{ text: 'hello' }, { text: 'Hello' }, { text: 'HELLO' }],
-      })
-      .withHelpers(helpers)
-      .toCompileTo('bar hellobar Hellobar HELLO');
-  });
-
-  it('this keyword nested inside helpers param', () => {
-    expectTemplate('{{#hellos}}{{foo text/this/foo}}{{/hellos}}').toThrow(
-      'Invalid path: text/this - 1:17'
-    );
-
-    expectTemplate('{{foo [this]}}')
-      .withInput({
-        foo(value: any) {
-          return value;
-        },
-        this: 'bar',
-      })
-      .toCompileTo('bar');
-
-    expectTemplate('{{foo text/[this]}}')
-      .withInput({
-        foo(value: any) {
-          return value;
-        },
-        text: { this: 'bar' },
-      })
-      .toCompileTo('bar');
-  });
-
-  it('pass string literals', () => {
-    expectTemplate('{{"foo"}}').toCompileTo('');
-    expectTemplate('{{"foo"}}').withInput({ foo: 'bar' }).toCompileTo('bar');
-
-    expectTemplate('{{#"foo"}}{{.}}{{/"foo"}}')
-      .withInput({
-        foo: ['bar', 'baz'],
-      })
-      .toCompileTo('barbaz');
-  });
-
-  it('pass number literals', () => {
-    expectTemplate('{{12}}').toCompileTo('');
-    expectTemplate('{{12}}').withInput({ '12': 'bar' }).toCompileTo('bar');
-    expectTemplate('{{12.34}}').toCompileTo('');
-    expectTemplate('{{12.34}}').withInput({ '12.34': 'bar' }).toCompileTo('bar');
-    expectTemplate('{{12.34 1}}')
-      .withInput({
-        '12.34'(arg: any) {
-          return 'bar' + arg;
-        },
-      })
-      .toCompileTo('bar1');
-  });
-
-  it('pass boolean literals', () => {
-    expectTemplate('{{true}}').toCompileTo('');
-    expectTemplate('{{true}}').withInput({ '': 'foo' }).toCompileTo('');
-    expectTemplate('{{false}}').withInput({ false: 'foo' }).toCompileTo('foo');
-  });
-
-  it('should handle literals in subexpression', () => {
-    expectTemplate('{{foo (false)}}')
-      .withInput({
-        false() {
-          return 'bar';
-        },
-      })
-      .withHelper('foo', function (arg) {
-        return arg;
-      })
-      .toCompileTo('bar');
-  });
-});
diff --git a/dev/lib/handlebars/src/spec/index.blocks.test.ts b/dev/lib/handlebars/src/spec/index.blocks.test.ts
deleted file mode 100644
index 2d9a8707..00000000
--- a/dev/lib/handlebars/src/spec/index.blocks.test.ts
+++ /dev/null
@@ -1,366 +0,0 @@
-/*
- * This file is forked from the handlebars project (https://github.com/handlebars-lang/handlebars.js),
- * and may include modifications made by Elasticsearch B.V.
- * Elasticsearch B.V. licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import Handlebars, { type HelperOptions } from '../..';
-import { expectTemplate } from '../__jest__/test_bench';
-
-describe('blocks', () => {
-  it('array', () => {
-    const string = '{{#goodbyes}}{{text}}! {{/goodbyes}}cruel {{world}}!';
-
-    expectTemplate(string)
-      .withInput({
-        goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }],
-        world: 'world',
-      })
-      .toCompileTo('goodbye! Goodbye! GOODBYE! cruel world!');
-
-    expectTemplate(string)
-      .withInput({
-        goodbyes: [],
-        world: 'world',
-      })
-      .toCompileTo('cruel world!');
-  });
-
-  it('array without data', () => {
-    expectTemplate('{{#goodbyes}}{{text}}{{/goodbyes}} {{#goodbyes}}{{text}}{{/goodbyes}}')
-      .withInput({
-        goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }],
-        world: 'world',
-      })
-      .toCompileTo('goodbyeGoodbyeGOODBYE goodbyeGoodbyeGOODBYE');
-  });
-
-  it('array with @index', () => {
-    expectTemplate('{{#goodbyes}}{{@index}}. {{text}}! {{/goodbyes}}cruel {{world}}!')
-      .withInput({
-        goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }],
-        world: 'world',
-      })
-      .toCompileTo('0. goodbye! 1. Goodbye! 2. GOODBYE! cruel world!');
-  });
-
-  it('empty block', () => {
-    const string = '{{#goodbyes}}{{/goodbyes}}cruel {{world}}!';
-
-    expectTemplate(string)
-      .withInput({
-        goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }],
-        world: 'world',
-      })
-      .toCompileTo('cruel world!');
-
-    expectTemplate(string)
-      .withInput({
-        goodbyes: [],
-        world: 'world',
-      })
-      .toCompileTo('cruel world!');
-  });
-
-  it('block with complex lookup', () => {
-    expectTemplate('{{#goodbyes}}{{text}} cruel {{../name}}! {{/goodbyes}}')
-      .withInput({
-        name: 'Alan',
-        goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }],
-      })
-      .toCompileTo('goodbye cruel Alan! Goodbye cruel Alan! GOODBYE cruel Alan! ');
-  });
-
-  it('multiple blocks with complex lookup', () => {
-    expectTemplate('{{#goodbyes}}{{../name}}{{../name}}{{/goodbyes}}')
-      .withInput({
-        name: 'Alan',
-        goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }],
-      })
-      .toCompileTo('AlanAlanAlanAlanAlanAlan');
-  });
-
-  it('block with complex lookup using nested context', () => {
-    expectTemplate('{{#goodbyes}}{{text}} cruel {{foo/../name}}! {{/goodbyes}}').toThrow(Error);
-  });
-
-  it('block with deep nested complex lookup', () => {
-    expectTemplate(
-      '{{#outer}}Goodbye {{#inner}}cruel {{../sibling}} {{../../omg}}{{/inner}}{{/outer}}'
-    )
-      .withInput({
-        omg: 'OMG!',
-        outer: [{ sibling: 'sad', inner: [{ text: 'goodbye' }] }],
-      })
-      .toCompileTo('Goodbye cruel sad OMG!');
-  });
-
-  it('works with cached blocks', () => {
-    expectTemplate('{{#each person}}{{#with .}}{{first}} {{last}}{{/with}}{{/each}}')
-      .withCompileOptions({ data: false })
-      .withInput({
-        person: [
-          { first: 'Alan', last: 'Johnson' },
-          { first: 'Alan', last: 'Johnson' },
-        ],
-      })
-      .toCompileTo('Alan JohnsonAlan Johnson');
-  });
-
-  describe('inverted sections', () => {
-    it('inverted sections with unset value', () => {
-      expectTemplate(
-        '{{#goodbyes}}{{this}}{{/goodbyes}}{{^goodbyes}}Right On!{{/goodbyes}}'
-      ).toCompileTo('Right On!');
-    });
-
-    it('inverted section with false value', () => {
-      expectTemplate('{{#goodbyes}}{{this}}{{/goodbyes}}{{^goodbyes}}Right On!{{/goodbyes}}')
-        .withInput({ goodbyes: false })
-        .toCompileTo('Right On!');
-    });
-
-    it('inverted section with empty set', () => {
-      expectTemplate('{{#goodbyes}}{{this}}{{/goodbyes}}{{^goodbyes}}Right On!{{/goodbyes}}')
-        .withInput({ goodbyes: [] })
-        .toCompileTo('Right On!');
-    });
-
-    it('block inverted sections', () => {
-      expectTemplate('{{#people}}{{name}}{{^}}{{none}}{{/people}}')
-        .withInput({ none: 'No people' })
-        .toCompileTo('No people');
-    });
-
-    it('chained inverted sections', () => {
-      expectTemplate('{{#people}}{{name}}{{else if none}}{{none}}{{/people}}')
-        .withInput({ none: 'No people' })
-        .toCompileTo('No people');
-
-      expectTemplate(
-        '{{#people}}{{name}}{{else if nothere}}fail{{else unless nothere}}{{none}}{{/people}}'
-      )
-        .withInput({ none: 'No people' })
-        .toCompileTo('No people');
-
-      expectTemplate('{{#people}}{{name}}{{else if none}}{{none}}{{else}}fail{{/people}}')
-        .withInput({ none: 'No people' })
-        .toCompileTo('No people');
-    });
-
-    it('chained inverted sections with mismatch', () => {
-      expectTemplate('{{#people}}{{name}}{{else if none}}{{none}}{{/if}}').toThrow(Error);
-    });
-
-    it('block inverted sections with empty arrays', () => {
-      expectTemplate('{{#people}}{{name}}{{^}}{{none}}{{/people}}')
-        .withInput({
-          none: 'No people',
-          people: [],
-        })
-        .toCompileTo('No people');
-    });
-  });
-
-  describe('standalone sections', () => {
-    it('block standalone else sections', () => {
-      expectTemplate('{{#people}}\n{{name}}\n{{^}}\n{{none}}\n{{/people}}\n')
-        .withInput({ none: 'No people' })
-        .toCompileTo('No people\n');
-
-      expectTemplate('{{#none}}\n{{.}}\n{{^}}\n{{none}}\n{{/none}}\n')
-        .withInput({ none: 'No people' })
-        .toCompileTo('No people\n');
-
-      expectTemplate('{{#people}}\n{{name}}\n{{^}}\n{{none}}\n{{/people}}\n')
-        .withInput({ none: 'No people' })
-        .toCompileTo('No people\n');
-    });
-
-    it('block standalone chained else sections', () => {
-      expectTemplate('{{#people}}\n{{name}}\n{{else if none}}\n{{none}}\n{{/people}}\n')
-        .withInput({ none: 'No people' })
-        .toCompileTo('No people\n');
-
-      expectTemplate('{{#people}}\n{{name}}\n{{else if none}}\n{{none}}\n{{^}}\n{{/people}}\n')
-        .withInput({ none: 'No people' })
-        .toCompileTo('No people\n');
-    });
-
-    it('should handle nesting', () => {
-      expectTemplate('{{#data}}\n{{#if true}}\n{{.}}\n{{/if}}\n{{/data}}\nOK.')
-        .withInput({
-          data: [1, 3, 5],
-        })
-        .toCompileTo('1\n3\n5\nOK.');
-    });
-  });
-
-  describe('decorators', () => {
-    it('should apply mustache decorators', () => {
-      expectTemplate('{{#helper}}{{*decorator}}{{/helper}}')
-        .withHelper('helper', function (options: HelperOptions) {
-          return (options.fn as any).run;
-        })
-        .withDecorator('decorator', function (fn) {
-          (fn as any).run = 'success';
-          return fn;
-        })
-        .toCompileTo('success');
-    });
-
-    it('should apply allow undefined return', () => {
-      expectTemplate('{{#helper}}{{*decorator}}suc{{/helper}}')
-        .withHelper('helper', function (options: HelperOptions) {
-          return options.fn() + (options.fn as any).run;
-        })
-        .withDecorator('decorator', function (fn) {
-          (fn as any).run = 'cess';
-        })
-        .toCompileTo('success');
-    });
-
-    it('should apply block decorators', () => {
-      expectTemplate('{{#helper}}{{#*decorator}}success{{/decorator}}{{/helper}}')
-        .withHelper('helper', function (options: HelperOptions) {
-          return (options.fn as any).run;
-        })
-        .withDecorator('decorator', function (fn, props, container, options) {
-          (fn as any).run = options.fn();
-          return fn;
-        })
-        .toCompileTo('success');
-    });
-
-    it('should support nested decorators', () => {
-      expectTemplate(
-        '{{#helper}}{{#*decorator}}{{#*nested}}suc{{/nested}}cess{{/decorator}}{{/helper}}'
-      )
-        .withHelper('helper', function (options: HelperOptions) {
-          return (options.fn as any).run;
-        })
-        .withDecorators({
-          decorator(fn, props, container, options) {
-            (fn as any).run = options.fn.nested + options.fn();
-            return fn;
-          },
-          nested(fn, props, container, options) {
-            props.nested = options.fn();
-          },
-        })
-        .toCompileTo('success');
-    });
-
-    it('should apply multiple decorators', () => {
-      expectTemplate(
-        '{{#helper}}{{#*decorator}}suc{{/decorator}}{{#*decorator}}cess{{/decorator}}{{/helper}}'
-      )
-        .withHelper('helper', function (options: HelperOptions) {
-          return (options.fn as any).run;
-        })
-        .withDecorator('decorator', function (fn, props, container, options) {
-          (fn as any).run = ((fn as any).run || '') + options.fn();
-          return fn;
-        })
-        .toCompileTo('success');
-    });
-
-    it('should access parent variables', () => {
-      expectTemplate('{{#helper}}{{*decorator foo}}{{/helper}}')
-        .withHelper('helper', function (options: HelperOptions) {
-          return (options.fn as any).run;
-        })
-        .withDecorator('decorator', function (fn, props, container, options) {
-          (fn as any).run = options.args;
-          return fn;
-        })
-        .withInput({ foo: 'success' })
-        .toCompileTo('success');
-    });
-
-    it('should work with root program', () => {
-      let run;
-      expectTemplate('{{*decorator "success"}}')
-        .withDecorator('decorator', function (fn, props, container, options) {
-          expect(options.args[0]).toEqual('success');
-          run = true;
-          return fn;
-        })
-        .withInput({ foo: 'success' })
-        .toCompileTo('');
-      expect(run).toEqual(true);
-    });
-
-    it('should fail when accessing variables from root', () => {
-      let run;
-      expectTemplate('{{*decorator foo}}')
-        .withDecorator('decorator', function (fn, props, container, options) {
-          expect(options.args[0]).toBeUndefined();
-          run = true;
-          return fn;
-        })
-        .withInput({ foo: 'fail' })
-        .toCompileTo('');
-      expect(run).toEqual(true);
-    });
-
-    describe('registration', () => {
-      beforeEach(() => {
-        global.kbnHandlebarsEnv = Handlebars.create();
-      });
-
-      afterEach(() => {
-        global.kbnHandlebarsEnv = null;
-      });
-
-      it('unregisters', () => {
-        // @ts-expect-error: Cannot assign to 'decorators' because it is a read-only property.
-        kbnHandlebarsEnv!.decorators = {};
-
-        kbnHandlebarsEnv!.registerDecorator('foo', function () {
-          return 'fail';
-        });
-
-        expect(!!kbnHandlebarsEnv!.decorators.foo).toEqual(true);
-        kbnHandlebarsEnv!.unregisterDecorator('foo');
-        expect(kbnHandlebarsEnv!.decorators.foo).toBeUndefined();
-      });
-
-      it('allows multiple globals', () => {
-        // @ts-expect-error: Cannot assign to 'decorators' because it is a read-only property.
-        kbnHandlebarsEnv!.decorators = {};
-
-        // @ts-expect-error: Expected 2 arguments, but got 1.
-        kbnHandlebarsEnv!.registerDecorator({
-          foo() {},
-          bar() {},
-        });
-
-        expect(!!kbnHandlebarsEnv!.decorators.foo).toEqual(true);
-        expect(!!kbnHandlebarsEnv!.decorators.bar).toEqual(true);
-        kbnHandlebarsEnv!.unregisterDecorator('foo');
-        kbnHandlebarsEnv!.unregisterDecorator('bar');
-        expect(kbnHandlebarsEnv!.decorators.foo).toBeUndefined();
-        expect(kbnHandlebarsEnv!.decorators.bar).toBeUndefined();
-      });
-
-      it('fails with multiple and args', () => {
-        expect(() => {
-          kbnHandlebarsEnv!.registerDecorator(
-            // @ts-expect-error: Argument of type '{ world(): string; testHelper(): string; }' is not assignable to parameter of type 'string'.
-            {
-              world() {
-                return 'world!';
-              },
-              testHelper() {
-                return 'found it!';
-              },
-            },
-            {}
-          );
-        }).toThrow('Arg not supported with multiple decorators');
-      });
-    });
-  });
-});
diff --git a/dev/lib/handlebars/src/spec/index.builtins.test.ts b/dev/lib/handlebars/src/spec/index.builtins.test.ts
deleted file mode 100644
index c47ec29f..00000000
--- a/dev/lib/handlebars/src/spec/index.builtins.test.ts
+++ /dev/null
@@ -1,676 +0,0 @@
-/*
- * This file is forked from the handlebars project (https://github.com/handlebars-lang/handlebars.js),
- * and may include modifications made by Elasticsearch B.V.
- * Elasticsearch B.V. licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-/* eslint-disable max-classes-per-file */
-
-import Handlebars from '../..';
-import { expectTemplate } from '../__jest__/test_bench';
-
-describe('builtin helpers', () => {
-  describe('#if', () => {
-    it('if', () => {
-      const string = '{{#if goodbye}}GOODBYE {{/if}}cruel {{world}}!';
-
-      expectTemplate(string)
-        .withInput({
-          goodbye: true,
-          world: 'world',
-        })
-        .toCompileTo('GOODBYE cruel world!');
-
-      expectTemplate(string)
-        .withInput({
-          goodbye: 'dummy',
-          world: 'world',
-        })
-        .toCompileTo('GOODBYE cruel world!');
-
-      expectTemplate(string)
-        .withInput({
-          goodbye: false,
-          world: 'world',
-        })
-        .toCompileTo('cruel world!');
-
-      expectTemplate(string).withInput({ world: 'world' }).toCompileTo('cruel world!');
-
-      expectTemplate(string)
-        .withInput({
-          goodbye: ['foo'],
-          world: 'world',
-        })
-        .toCompileTo('GOODBYE cruel world!');
-
-      expectTemplate(string)
-        .withInput({
-          goodbye: [],
-          world: 'world',
-        })
-        .toCompileTo('cruel world!');
-
-      expectTemplate(string)
-        .withInput({
-          goodbye: 0,
-          world: 'world',
-        })
-        .toCompileTo('cruel world!');
-
-      expectTemplate('{{#if goodbye includeZero=true}}GOODBYE {{/if}}cruel {{world}}!')
-        .withInput({
-          goodbye: 0,
-          world: 'world',
-        })
-        .toCompileTo('GOODBYE cruel world!');
-    });
-
-    it('if with function argument', () => {
-      const string = '{{#if goodbye}}GOODBYE {{/if}}cruel {{world}}!';
-
-      expectTemplate(string)
-        .withInput({
-          goodbye() {
-            return true;
-          },
-          world: 'world',
-        })
-        .toCompileTo('GOODBYE cruel world!');
-
-      expectTemplate(string)
-        .withInput({
-          goodbye() {
-            return this.world;
-          },
-          world: 'world',
-        })
-        .toCompileTo('GOODBYE cruel world!');
-
-      expectTemplate(string)
-        .withInput({
-          goodbye() {
-            return false;
-          },
-          world: 'world',
-        })
-        .toCompileTo('cruel world!');
-
-      expectTemplate(string)
-        .withInput({
-          goodbye() {
-            return this.foo;
-          },
-          world: 'world',
-        })
-        .toCompileTo('cruel world!');
-    });
-
-    it('should not change the depth list', () => {
-      expectTemplate('{{#with foo}}{{#if goodbye}}GOODBYE cruel {{../world}}!{{/if}}{{/with}}')
-        .withInput({
-          foo: { goodbye: true },
-          world: 'world',
-        })
-        .toCompileTo('GOODBYE cruel world!');
-    });
-  });
-
-  describe('#with', () => {
-    it('with', () => {
-      expectTemplate('{{#with person}}{{first}} {{last}}{{/with}}')
-        .withInput({
-          person: {
-            first: 'Alan',
-            last: 'Johnson',
-          },
-        })
-        .toCompileTo('Alan Johnson');
-    });
-
-    it('with with function argument', () => {
-      expectTemplate('{{#with person}}{{first}} {{last}}{{/with}}')
-        .withInput({
-          person() {
-            return {
-              first: 'Alan',
-              last: 'Johnson',
-            };
-          },
-        })
-        .toCompileTo('Alan Johnson');
-    });
-
-    it('with with else', () => {
-      expectTemplate(
-        '{{#with person}}Person is present{{else}}Person is not present{{/with}}'
-      ).toCompileTo('Person is not present');
-    });
-
-    it('with provides block parameter', () => {
-      expectTemplate('{{#with person as |foo|}}{{foo.first}} {{last}}{{/with}}')
-        .withInput({
-          person: {
-            first: 'Alan',
-            last: 'Johnson',
-          },
-        })
-        .toCompileTo('Alan Johnson');
-    });
-
-    it('works when data is disabled', () => {
-      expectTemplate('{{#with person as |foo|}}{{foo.first}} {{last}}{{/with}}')
-        .withInput({ person: { first: 'Alan', last: 'Johnson' } })
-        .withCompileOptions({ data: false })
-        .toCompileTo('Alan Johnson');
-    });
-  });
-
-  describe('#each', () => {
-    it('each', () => {
-      const string = '{{#each goodbyes}}{{text}}! {{/each}}cruel {{world}}!';
-
-      expectTemplate(string)
-        .withInput({
-          goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }],
-          world: 'world',
-        })
-        .toCompileTo('goodbye! Goodbye! GOODBYE! cruel world!');
-
-      expectTemplate(string)
-        .withInput({
-          goodbyes: [],
-          world: 'world',
-        })
-        .toCompileTo('cruel world!');
-    });
-
-    it('each without data', () => {
-      expectTemplate('{{#each goodbyes}}{{text}}! {{/each}}cruel {{world}}!')
-        .withInput({
-          goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }],
-          world: 'world',
-        })
-        .withRuntimeOptions({ data: false })
-        .withCompileOptions({ data: false })
-        .toCompileTo('goodbye! Goodbye! GOODBYE! cruel world!');
-
-      expectTemplate('{{#each .}}{{.}}{{/each}}')
-        .withInput({ goodbyes: 'cruel', world: 'world' })
-        .withRuntimeOptions({ data: false })
-        .withCompileOptions({ data: false })
-        .toCompileTo('cruelworld');
-    });
-
-    it('each without context', () => {
-      expectTemplate('{{#each goodbyes}}{{text}}! {{/each}}cruel {{world}}!')
-        .withInput(undefined)
-        .toCompileTo('cruel !');
-    });
-
-    it('each with an object and @key', () => {
-      const string = '{{#each goodbyes}}{{@key}}. {{text}}! {{/each}}cruel {{world}}!';
-
-      function Clazz(this: any) {
-        this['<b>#1</b>'] = { text: 'goodbye' };
-        this[2] = { text: 'GOODBYE' };
-      }
-      Clazz.prototype.foo = 'fail';
-      const hash = { goodbyes: new (Clazz as any)(), world: 'world' };
-
-      // Object property iteration order is undefined according to ECMA spec,
-      // so we need to check both possible orders
-      // @see http://stackoverflow.com/questions/280713/elements-order-in-a-for-in-loop
-      try {
-        expectTemplate(string)
-          .withInput(hash)
-          .toCompileTo('&lt;b&gt;#1&lt;/b&gt;. goodbye! 2. GOODBYE! cruel world!');
-      } catch (e) {
-        expectTemplate(string)
-          .withInput(hash)
-          .toCompileTo('2. GOODBYE! &lt;b&gt;#1&lt;/b&gt;. goodbye! cruel world!');
-      }
-
-      expectTemplate(string)
-        .withInput({
-          goodbyes: {},
-          world: 'world',
-        })
-        .toCompileTo('cruel world!');
-    });
-
-    it('each with @index', () => {
-      expectTemplate('{{#each goodbyes}}{{@index}}. {{text}}! {{/each}}cruel {{world}}!')
-        .withInput({
-          goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }],
-          world: 'world',
-        })
-        .toCompileTo('0. goodbye! 1. Goodbye! 2. GOODBYE! cruel world!');
-    });
-
-    it('each with nested @index', () => {
-      expectTemplate(
-        '{{#each goodbyes}}{{@index}}. {{text}}! {{#each ../goodbyes}}{{@index}} {{/each}}After {{@index}} {{/each}}{{@index}}cruel {{world}}!'
-      )
-        .withInput({
-          goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }],
-          world: 'world',
-        })
-        .toCompileTo(
-          '0. goodbye! 0 1 2 After 0 1. Goodbye! 0 1 2 After 1 2. GOODBYE! 0 1 2 After 2 cruel world!'
-        );
-    });
-
-    it('each with block params', () => {
-      expectTemplate(
-        '{{#each goodbyes as |value index|}}{{index}}. {{value.text}}! {{#each ../goodbyes as |childValue childIndex|}} {{index}} {{childIndex}}{{/each}} After {{index}} {{/each}}{{index}}cruel {{world}}!'
-      )
-        .withInput({
-          goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }],
-          world: 'world',
-        })
-        .toCompileTo('0. goodbye!  0 0 0 1 After 0 1. Goodbye!  1 0 1 1 After 1 cruel world!');
-    });
-
-    // TODO: This test has been added to the `4.x` branch of the handlebars.js repo along with a code-fix,
-    // but a new version of the handlebars package containing this fix has not yet been published to npm.
-    //
-    // Before enabling this code, a new version of handlebars needs to be released and the corresponding
-    // updates needs to be applied to this implementation.
-    //
-    // See: https://github.com/handlebars-lang/handlebars.js/commit/30dbf0478109ded8f12bb29832135d480c17e367
-    it.skip('each with block params and strict compilation', () => {
-      expectTemplate('{{#each goodbyes as |value index|}}{{index}}. {{value.text}}!{{/each}}')
-        .withCompileOptions({ strict: true })
-        .withInput({ goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }] })
-        .toCompileTo('0. goodbye!1. Goodbye!');
-    });
-
-    it('each object with @index', () => {
-      expectTemplate('{{#each goodbyes}}{{@index}}. {{text}}! {{/each}}cruel {{world}}!')
-        .withInput({
-          goodbyes: {
-            a: { text: 'goodbye' },
-            b: { text: 'Goodbye' },
-            c: { text: 'GOODBYE' },
-          },
-          world: 'world',
-        })
-        .toCompileTo('0. goodbye! 1. Goodbye! 2. GOODBYE! cruel world!');
-    });
-
-    it('each with @first', () => {
-      expectTemplate('{{#each goodbyes}}{{#if @first}}{{text}}! {{/if}}{{/each}}cruel {{world}}!')
-        .withInput({
-          goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }],
-          world: 'world',
-        })
-        .toCompileTo('goodbye! cruel world!');
-    });
-
-    it('each with nested @first', () => {
-      expectTemplate(
-        '{{#each goodbyes}}({{#if @first}}{{text}}! {{/if}}{{#each ../goodbyes}}{{#if @first}}{{text}}!{{/if}}{{/each}}{{#if @first}} {{text}}!{{/if}}) {{/each}}cruel {{world}}!'
-      )
-        .withInput({
-          goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }],
-          world: 'world',
-        })
-        .toCompileTo('(goodbye! goodbye! goodbye!) (goodbye!) (goodbye!) cruel world!');
-    });
-
-    it('each object with @first', () => {
-      expectTemplate('{{#each goodbyes}}{{#if @first}}{{text}}! {{/if}}{{/each}}cruel {{world}}!')
-        .withInput({
-          goodbyes: { foo: { text: 'goodbye' }, bar: { text: 'Goodbye' } },
-          world: 'world',
-        })
-        .toCompileTo('goodbye! cruel world!');
-    });
-
-    it('each with @last', () => {
-      expectTemplate('{{#each goodbyes}}{{#if @last}}{{text}}! {{/if}}{{/each}}cruel {{world}}!')
-        .withInput({
-          goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }],
-          world: 'world',
-        })
-        .toCompileTo('GOODBYE! cruel world!');
-    });
-
-    it('each object with @last', () => {
-      expectTemplate('{{#each goodbyes}}{{#if @last}}{{text}}! {{/if}}{{/each}}cruel {{world}}!')
-        .withInput({
-          goodbyes: { foo: { text: 'goodbye' }, bar: { text: 'Goodbye' } },
-          world: 'world',
-        })
-        .toCompileTo('Goodbye! cruel world!');
-    });
-
-    it('each with nested @last', () => {
-      expectTemplate(
-        '{{#each goodbyes}}({{#if @last}}{{text}}! {{/if}}{{#each ../goodbyes}}{{#if @last}}{{text}}!{{/if}}{{/each}}{{#if @last}} {{text}}!{{/if}}) {{/each}}cruel {{world}}!'
-      )
-        .withInput({
-          goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }],
-          world: 'world',
-        })
-        .toCompileTo('(GOODBYE!) (GOODBYE!) (GOODBYE! GOODBYE! GOODBYE!) cruel world!');
-    });
-
-    it('each with function argument', () => {
-      const string = '{{#each goodbyes}}{{text}}! {{/each}}cruel {{world}}!';
-
-      expectTemplate(string)
-        .withInput({
-          goodbyes() {
-            return [{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }];
-          },
-          world: 'world',
-        })
-        .toCompileTo('goodbye! Goodbye! GOODBYE! cruel world!');
-
-      expectTemplate(string)
-        .withInput({
-          goodbyes: [],
-          world: 'world',
-        })
-        .toCompileTo('cruel world!');
-    });
-
-    it('each object when last key is an empty string', () => {
-      expectTemplate('{{#each goodbyes}}{{@index}}. {{text}}! {{/each}}cruel {{world}}!')
-        .withInput({
-          goodbyes: {
-            a: { text: 'goodbye' },
-            b: { text: 'Goodbye' },
-            '': { text: 'GOODBYE' },
-          },
-          world: 'world',
-        })
-        .toCompileTo('0. goodbye! 1. Goodbye! 2. GOODBYE! cruel world!');
-    });
-
-    it('data passed to helpers', () => {
-      expectTemplate('{{#each letters}}{{this}}{{detectDataInsideEach}}{{/each}}')
-        .withInput({ letters: ['a', 'b', 'c'] })
-        .withHelper('detectDataInsideEach', function (options) {
-          return options.data && options.data.exclaim;
-        })
-        .withRuntimeOptions({
-          data: {
-            exclaim: '!',
-          },
-        })
-        .toCompileTo('a!b!c!');
-    });
-
-    it('each on implicit context', () => {
-      expectTemplate('{{#each}}{{text}}! {{/each}}cruel world!').toThrow(Handlebars.Exception);
-    });
-
-    it('each on iterable', () => {
-      class Iterator {
-        private arr: any[];
-        private index: number = 0;
-
-        constructor(arr: any[]) {
-          this.arr = arr;
-        }
-
-        next() {
-          const value = this.arr[this.index];
-          const done = this.index === this.arr.length;
-          if (!done) {
-            this.index++;
-          }
-          return { value, done };
-        }
-      }
-
-      class Iterable {
-        private arr: any[];
-
-        constructor(arr: any[]) {
-          this.arr = arr;
-        }
-
-        [Symbol.iterator]() {
-          return new Iterator(this.arr);
-        }
-      }
-
-      const string = '{{#each goodbyes}}{{text}}! {{/each}}cruel {{world}}!';
-
-      expectTemplate(string)
-        .withInput({
-          goodbyes: new Iterable([{ text: 'goodbye' }, { text: 'Goodbye' }, { text: 'GOODBYE' }]),
-          world: 'world',
-        })
-        .toCompileTo('goodbye! Goodbye! GOODBYE! cruel world!');
-
-      expectTemplate(string)
-        .withInput({
-          goodbyes: new Iterable([]),
-          world: 'world',
-        })
-        .toCompileTo('cruel world!');
-    });
-  });
-
-  describe('#log', function () {
-    /* eslint-disable no-console */
-    let $log: typeof console.log;
-    let $info: typeof console.info;
-    let $error: typeof console.error;
-
-    beforeEach(function () {
-      $log = console.log;
-      $info = console.info;
-      $error = console.error;
-
-      global.kbnHandlebarsEnv = Handlebars.create();
-    });
-
-    afterEach(function () {
-      console.log = $log;
-      console.info = $info;
-      console.error = $error;
-
-      global.kbnHandlebarsEnv = null;
-    });
-
-    it('should call logger at default level', function () {
-      let levelArg;
-      let logArg;
-      kbnHandlebarsEnv!.log = function (level, arg) {
-        levelArg = level;
-        logArg = arg;
-      };
-
-      expectTemplate('{{log blah}}').withInput({ blah: 'whee' }).toCompileTo('');
-      expect(1).toEqual(levelArg);
-      expect('whee').toEqual(logArg);
-    });
-
-    it('should call logger at data level', function () {
-      let levelArg;
-      let logArg;
-      kbnHandlebarsEnv!.log = function (level, arg) {
-        levelArg = level;
-        logArg = arg;
-      };
-
-      expectTemplate('{{log blah}}')
-        .withInput({ blah: 'whee' })
-        .withRuntimeOptions({ data: { level: '03' } })
-        .withCompileOptions({ data: true })
-        .toCompileTo('');
-      expect('03').toEqual(levelArg);
-      expect('whee').toEqual(logArg);
-    });
-
-    it('should output to info', function () {
-      let calls = 0;
-      const callsExpected = process.env.AST || process.env.EVAL ? 1 : 2;
-
-      console.info = function (info) {
-        expect('whee').toEqual(info);
-        calls++;
-        if (calls === callsExpected) {
-          console.info = $info;
-          console.log = $log;
-        }
-      };
-      console.log = function (log) {
-        expect('whee').toEqual(log);
-        calls++;
-        if (calls === callsExpected) {
-          console.info = $info;
-          console.log = $log;
-        }
-      };
-
-      expectTemplate('{{log blah}}').withInput({ blah: 'whee' }).toCompileTo('');
-      expect(calls).toEqual(callsExpected);
-    });
-
-    it('should log at data level', function () {
-      let calls = 0;
-      const callsExpected = process.env.AST || process.env.EVAL ? 1 : 2;
-
-      console.error = function (log) {
-        expect('whee').toEqual(log);
-        calls++;
-        if (calls === callsExpected) console.error = $error;
-      };
-
-      expectTemplate('{{log blah}}')
-        .withInput({ blah: 'whee' })
-        .withRuntimeOptions({ data: { level: '03' } })
-        .withCompileOptions({ data: true })
-        .toCompileTo('');
-      expect(calls).toEqual(callsExpected);
-    });
-
-    it('should handle missing logger', function () {
-      let calls = 0;
-      const callsExpected = process.env.AST || process.env.EVAL ? 1 : 2;
-
-      // @ts-expect-error
-      console.error = undefined;
-      console.log = function (log) {
-        expect('whee').toEqual(log);
-        calls++;
-        if (calls === callsExpected) console.log = $log;
-      };
-
-      expectTemplate('{{log blah}}')
-        .withInput({ blah: 'whee' })
-        .withRuntimeOptions({ data: { level: '03' } })
-        .withCompileOptions({ data: true })
-        .toCompileTo('');
-      expect(calls).toEqual(callsExpected);
-    });
-
-    it('should handle string log levels', function () {
-      let calls = 0;
-      const callsExpected = process.env.AST || process.env.EVAL ? 1 : 2;
-
-      console.error = function (log) {
-        expect('whee').toEqual(log);
-        calls++;
-      };
-
-      expectTemplate('{{log blah}}')
-        .withInput({ blah: 'whee' })
-        .withRuntimeOptions({ data: { level: 'error' } })
-        .withCompileOptions({ data: true })
-        .toCompileTo('');
-      expect(calls).toEqual(callsExpected);
-
-      calls = 0;
-
-      expectTemplate('{{log blah}}')
-        .withInput({ blah: 'whee' })
-        .withRuntimeOptions({ data: { level: 'ERROR' } })
-        .withCompileOptions({ data: true })
-        .toCompileTo('');
-      expect(calls).toEqual(callsExpected);
-    });
-
-    it('should handle hash log levels [1]', function () {
-      let calls = 0;
-      const callsExpected = process.env.AST || process.env.EVAL ? 1 : 2;
-
-      console.error = function (log) {
-        expect('whee').toEqual(log);
-        calls++;
-      };
-
-      expectTemplate('{{log blah level="error"}}').withInput({ blah: 'whee' }).toCompileTo('');
-      expect(calls).toEqual(callsExpected);
-    });
-
-    it('should handle hash log levels [2]', function () {
-      let called = false;
-
-      console.info =
-        console.log =
-        console.error =
-        console.debug =
-          function () {
-            called = true;
-            console.info = console.log = console.error = console.debug = $log;
-          };
-
-      expectTemplate('{{log blah level="debug"}}').withInput({ blah: 'whee' }).toCompileTo('');
-      expect(false).toEqual(called);
-    });
-
-    it('should pass multiple log arguments', function () {
-      let calls = 0;
-      const callsExpected = process.env.AST || process.env.EVAL ? 1 : 2;
-
-      console.info = console.log = function (log1, log2, log3) {
-        expect('whee').toEqual(log1);
-        expect('foo').toEqual(log2);
-        expect(1).toEqual(log3);
-        calls++;
-        if (calls === callsExpected) console.log = $log;
-      };
-
-      expectTemplate('{{log blah "foo" 1}}').withInput({ blah: 'whee' }).toCompileTo('');
-      expect(calls).toEqual(callsExpected);
-    });
-
-    it('should pass zero log arguments', function () {
-      let calls = 0;
-      const callsExpected = process.env.AST || process.env.EVAL ? 1 : 2;
-
-      console.info = console.log = function () {
-        expect(arguments.length).toEqual(0);
-        calls++;
-        if (calls === callsExpected) console.log = $log;
-      };
-
-      expectTemplate('{{log}}').withInput({ blah: 'whee' }).toCompileTo('');
-      expect(calls).toEqual(callsExpected);
-    });
-    /* eslint-enable no-console */
-  });
-
-  describe('#lookup', () => {
-    it('should lookup arbitrary content', () => {
-      expectTemplate('{{#each goodbyes}}{{lookup ../data .}}{{/each}}')
-        .withInput({ goodbyes: [0, 1], data: ['foo', 'bar'] })
-        .toCompileTo('foobar');
-    });
-
-    it('should not fail on undefined value', () => {
-      expectTemplate('{{#each goodbyes}}{{lookup ../bar .}}{{/each}}')
-        .withInput({ goodbyes: [0, 1], data: ['foo', 'bar'] })
-        .toCompileTo('');
-    });
-  });
-});
diff --git a/dev/lib/handlebars/src/spec/index.compiler.test.ts b/dev/lib/handlebars/src/spec/index.compiler.test.ts
deleted file mode 100644
index ef5c55f2..00000000
--- a/dev/lib/handlebars/src/spec/index.compiler.test.ts
+++ /dev/null
@@ -1,86 +0,0 @@
-/*
- * This file is forked from the handlebars project (https://github.com/handlebars-lang/handlebars.js),
- * and may include modifications made by Elasticsearch B.V.
- * Elasticsearch B.V. licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import Handlebars from '../..';
-import { forEachCompileFunctionName } from '../__jest__/test_bench';
-
-describe('compiler', () => {
-  forEachCompileFunctionName((compileName) => {
-    const compile = Handlebars[compileName].bind(Handlebars);
-
-    describe(`#${compileName}`, () => {
-      it('should fail with invalid input', () => {
-        expect(function () {
-          compile(null);
-        }).toThrow(
-          `You must pass a string or Handlebars AST to Handlebars.${compileName}. You passed null`
-        );
-
-        expect(function () {
-          compile({});
-        }).toThrow(
-          `You must pass a string or Handlebars AST to Handlebars.${compileName}. You passed [object Object]`
-        );
-      });
-
-      it('should include the location in the error (row and column)', () => {
-        try {
-          compile(' \n  {{#if}}\n{{/def}}')();
-          expect(true).toEqual(false);
-        } catch (err) {
-          expect(err.message).toEqual("if doesn't match def - 2:5");
-          if (Object.getOwnPropertyDescriptor(err, 'column')!.writable) {
-            // In Safari 8, the column-property is read-only. This means that even if it is set with defineProperty,
-            // its value won't change (https://github.com/jquery/esprima/issues/1290#issuecomment-132455482)
-            // Since this was neither working in Handlebars 3 nor in 4.0.5, we only check the column for other browsers.
-            expect(err.column).toEqual(5);
-          }
-          expect(err.lineNumber).toEqual(2);
-        }
-      });
-
-      it('should include the location as enumerable property', () => {
-        try {
-          compile(' \n  {{#if}}\n{{/def}}')();
-          expect(true).toEqual(false);
-        } catch (err) {
-          expect(Object.prototype.propertyIsEnumerable.call(err, 'column')).toEqual(true);
-        }
-      });
-
-      it('can utilize AST instance', () => {
-        expect(
-          compile({
-            type: 'Program',
-            body: [{ type: 'ContentStatement', value: 'Hello' }],
-          })()
-        ).toEqual('Hello');
-      });
-
-      it('can pass through an empty string', () => {
-        expect(compile('')()).toEqual('');
-      });
-
-      it('should not modify the options.data property(GH-1327)', () => {
-        // The `data` property is supposed to be a boolean, but in this test we want to ignore that
-        const options = { data: [{ a: 'foo' }, { a: 'bar' }] as unknown as boolean };
-        compile('{{#each data}}{{@index}}:{{a}} {{/each}}', options)();
-        expect(JSON.stringify(options, null, 2)).toEqual(
-          JSON.stringify({ data: [{ a: 'foo' }, { a: 'bar' }] }, null, 2)
-        );
-      });
-
-      it('should not modify the options.knownHelpers property(GH-1327)', () => {
-        const options = { knownHelpers: {} };
-        compile('{{#each data}}{{@index}}:{{a}} {{/each}}', options)();
-        expect(JSON.stringify(options, null, 2)).toEqual(
-          JSON.stringify({ knownHelpers: {} }, null, 2)
-        );
-      });
-    });
-  });
-});
diff --git a/dev/lib/handlebars/src/spec/index.data.test.ts b/dev/lib/handlebars/src/spec/index.data.test.ts
deleted file mode 100644
index 94d3b51c..00000000
--- a/dev/lib/handlebars/src/spec/index.data.test.ts
+++ /dev/null
@@ -1,269 +0,0 @@
-/*
- * This file is forked from the handlebars project (https://github.com/handlebars-lang/handlebars.js),
- * and may include modifications made by Elasticsearch B.V.
- * Elasticsearch B.V. licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import Handlebars, { type HelperOptions } from '../..';
-import { expectTemplate } from '../__jest__/test_bench';
-
-describe('data', () => {
-  it('passing in data to a compiled function that expects data - works with helpers', () => {
-    expectTemplate('{{hello}}')
-      .withCompileOptions({ data: true })
-      .withHelper('hello', function (this: any, options) {
-        return options.data.adjective + ' ' + this.noun;
-      })
-      .withRuntimeOptions({ data: { adjective: 'happy' } })
-      .withInput({ noun: 'cat' })
-      .toCompileTo('happy cat');
-  });
-
-  it('data can be looked up via @foo', () => {
-    expectTemplate('{{@hello}}')
-      .withRuntimeOptions({ data: { hello: 'hello' } })
-      .toCompileTo('hello');
-  });
-
-  it('deep @foo triggers automatic top-level data', () => {
-    global.kbnHandlebarsEnv = Handlebars.create();
-    const helpers = Handlebars.createFrame(kbnHandlebarsEnv!.helpers);
-
-    helpers.let = function (options: HelperOptions) {
-      const frame = Handlebars.createFrame(options.data);
-
-      for (const prop in options.hash) {
-        if (prop in options.hash) {
-          frame[prop] = options.hash[prop];
-        }
-      }
-      return options.fn(this, { data: frame });
-    };
-
-    expectTemplate(
-      '{{#let world="world"}}{{#if foo}}{{#if foo}}Hello {{@world}}{{/if}}{{/if}}{{/let}}'
-    )
-      .withInput({ foo: true })
-      .withHelpers(helpers)
-      .toCompileTo('Hello world');
-
-    global.kbnHandlebarsEnv = null;
-  });
-
-  it('parameter data can be looked up via @foo', () => {
-    expectTemplate('{{hello @world}}')
-      .withRuntimeOptions({ data: { world: 'world' } })
-      .withHelper('hello', function (noun) {
-        return 'Hello ' + noun;
-      })
-      .toCompileTo('Hello world');
-  });
-
-  it('hash values can be looked up via @foo', () => {
-    expectTemplate('{{hello noun=@world}}')
-      .withRuntimeOptions({ data: { world: 'world' } })
-      .withHelper('hello', function (options) {
-        return 'Hello ' + options.hash.noun;
-      })
-      .toCompileTo('Hello world');
-  });
-
-  it('nested parameter data can be looked up via @foo.bar', () => {
-    expectTemplate('{{hello @world.bar}}')
-      .withRuntimeOptions({ data: { world: { bar: 'world' } } })
-      .withHelper('hello', function (noun) {
-        return 'Hello ' + noun;
-      })
-      .toCompileTo('Hello world');
-  });
-
-  it('nested parameter data does not fail with @world.bar', () => {
-    expectTemplate('{{hello @world.bar}}')
-      .withRuntimeOptions({ data: { foo: { bar: 'world' } } })
-      .withHelper('hello', function (noun) {
-        return 'Hello ' + noun;
-      })
-      .toCompileTo('Hello undefined');
-  });
-
-  it('parameter data throws when using complex scope references', () => {
-    expectTemplate('{{#goodbyes}}{{text}} cruel {{@foo/../name}}! {{/goodbyes}}').toThrow(Error);
-  });
-
-  it('data can be functions', () => {
-    expectTemplate('{{@hello}}')
-      .withRuntimeOptions({
-        data: {
-          hello() {
-            return 'hello';
-          },
-        },
-      })
-      .toCompileTo('hello');
-  });
-
-  it('data can be functions with params', () => {
-    expectTemplate('{{@hello "hello"}}')
-      .withRuntimeOptions({
-        data: {
-          hello(arg: any) {
-            return arg;
-          },
-        },
-      })
-      .toCompileTo('hello');
-  });
-
-  it('data is inherited downstream', () => {
-    expectTemplate(
-      '{{#let foo=1 bar=2}}{{#let foo=bar.baz}}{{@bar}}{{@foo}}{{/let}}{{@foo}}{{/let}}'
-    )
-      .withInput({ bar: { baz: 'hello world' } })
-      .withCompileOptions({ data: true })
-      .withHelper('let', function (this: any, options) {
-        const frame = Handlebars.createFrame(options.data);
-        for (const prop in options.hash) {
-          if (prop in options.hash) {
-            frame[prop] = options.hash[prop];
-          }
-        }
-        return options.fn(this, { data: frame });
-      })
-      .withRuntimeOptions({ data: {} })
-      .toCompileTo('2hello world1');
-  });
-
-  it('passing in data to a compiled function that expects data - works with helpers in partials', () => {
-    expectTemplate('{{>myPartial}}')
-      .withCompileOptions({ data: true })
-      .withPartial('myPartial', '{{hello}}')
-      .withHelper('hello', function (this: any, options: HelperOptions) {
-        return options.data.adjective + ' ' + this.noun;
-      })
-      .withInput({ noun: 'cat' })
-      .withRuntimeOptions({ data: { adjective: 'happy' } })
-      .toCompileTo('happy cat');
-  });
-
-  it('passing in data to a compiled function that expects data - works with helpers and parameters', () => {
-    expectTemplate('{{hello world}}')
-      .withCompileOptions({ data: true })
-      .withHelper('hello', function (this: any, noun, options) {
-        return options.data.adjective + ' ' + noun + (this.exclaim ? '!' : '');
-      })
-      .withInput({ exclaim: true, world: 'world' })
-      .withRuntimeOptions({ data: { adjective: 'happy' } })
-      .toCompileTo('happy world!');
-  });
-
-  it('passing in data to a compiled function that expects data - works with block helpers', () => {
-    expectTemplate('{{#hello}}{{world}}{{/hello}}')
-      .withCompileOptions({
-        data: true,
-      })
-      .withHelper('hello', function (this: any, options) {
-        return options.fn(this);
-      })
-      .withHelper('world', function (this: any, options) {
-        return options.data.adjective + ' world' + (this.exclaim ? '!' : '');
-      })
-      .withInput({ exclaim: true })
-      .withRuntimeOptions({ data: { adjective: 'happy' } })
-      .toCompileTo('happy world!');
-  });
-
-  it('passing in data to a compiled function that expects data - works with block helpers that use ..', () => {
-    expectTemplate('{{#hello}}{{world ../zomg}}{{/hello}}')
-      .withCompileOptions({ data: true })
-      .withHelper('hello', function (options) {
-        return options.fn({ exclaim: '?' });
-      })
-      .withHelper('world', function (this: any, thing, options) {
-        return options.data.adjective + ' ' + thing + (this.exclaim || '');
-      })
-      .withInput({ exclaim: true, zomg: 'world' })
-      .withRuntimeOptions({ data: { adjective: 'happy' } })
-      .toCompileTo('happy world?');
-  });
-
-  it('passing in data to a compiled function that expects data - data is passed to with block helpers where children use ..', () => {
-    expectTemplate('{{#hello}}{{world ../zomg}}{{/hello}}')
-      .withCompileOptions({ data: true })
-      .withHelper('hello', function (options) {
-        return options.data.accessData + ' ' + options.fn({ exclaim: '?' });
-      })
-      .withHelper('world', function (this: any, thing, options) {
-        return options.data.adjective + ' ' + thing + (this.exclaim || '');
-      })
-      .withInput({ exclaim: true, zomg: 'world' })
-      .withRuntimeOptions({ data: { adjective: 'happy', accessData: '#win' } })
-      .toCompileTo('#win happy world?');
-  });
-
-  it('you can override inherited data when invoking a helper', () => {
-    expectTemplate('{{#hello}}{{world zomg}}{{/hello}}')
-      .withCompileOptions({ data: true })
-      .withHelper('hello', function (options) {
-        return options.fn({ exclaim: '?', zomg: 'world' }, { data: { adjective: 'sad' } });
-      })
-      .withHelper('world', function (this: any, thing, options) {
-        return options.data.adjective + ' ' + thing + (this.exclaim || '');
-      })
-      .withInput({ exclaim: true, zomg: 'planet' })
-      .withRuntimeOptions({ data: { adjective: 'happy' } })
-      .toCompileTo('sad world?');
-  });
-
-  it('you can override inherited data when invoking a helper with depth', () => {
-    expectTemplate('{{#hello}}{{world ../zomg}}{{/hello}}')
-      .withCompileOptions({ data: true })
-      .withHelper('hello', function (options) {
-        return options.fn({ exclaim: '?' }, { data: { adjective: 'sad' } });
-      })
-      .withHelper('world', function (this: any, thing, options) {
-        return options.data.adjective + ' ' + thing + (this.exclaim || '');
-      })
-      .withInput({ exclaim: true, zomg: 'world' })
-      .withRuntimeOptions({ data: { adjective: 'happy' } })
-      .toCompileTo('sad world?');
-  });
-
-  describe('@root', () => {
-    it('the root context can be looked up via @root', () => {
-      expectTemplate('{{@root.foo}}')
-        .withInput({ foo: 'hello' })
-        .withRuntimeOptions({ data: {} })
-        .toCompileTo('hello');
-
-      expectTemplate('{{@root.foo}}').withInput({ foo: 'hello' }).toCompileTo('hello');
-    });
-
-    it('passed root values take priority', () => {
-      expectTemplate('{{@root.foo}}')
-        .withInput({ foo: 'should not be used' })
-        .withRuntimeOptions({ data: { root: { foo: 'hello' } } })
-        .toCompileTo('hello');
-    });
-  });
-
-  describe('nesting', () => {
-    it('the root context can be looked up via @root', () => {
-      expectTemplate(
-        '{{#helper}}{{#helper}}{{@./depth}} {{@../depth}} {{@../../depth}}{{/helper}}{{/helper}}'
-      )
-        .withInput({ foo: 'hello' })
-        .withHelper('helper', function (this: any, options) {
-          const frame = Handlebars.createFrame(options.data);
-          frame.depth = options.data.depth + 1;
-          return options.fn(this, { data: frame });
-        })
-        .withRuntimeOptions({
-          data: {
-            depth: 0,
-          },
-        })
-        .toCompileTo('2 1 0');
-    });
-  });
-});
diff --git a/dev/lib/handlebars/src/spec/index.helpers.test.ts b/dev/lib/handlebars/src/spec/index.helpers.test.ts
deleted file mode 100644
index 4cfa39bb..00000000
--- a/dev/lib/handlebars/src/spec/index.helpers.test.ts
+++ /dev/null
@@ -1,958 +0,0 @@
-/*
- * This file is forked from the handlebars project (https://github.com/handlebars-lang/handlebars.js),
- * and may include modifications made by Elasticsearch B.V.
- * Elasticsearch B.V. licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import Handlebars, { type HelperOptions } from '../..';
-import { expectTemplate } from '../__jest__/test_bench';
-
-beforeEach(() => {
-  global.kbnHandlebarsEnv = Handlebars.create();
-});
-
-afterEach(() => {
-  global.kbnHandlebarsEnv = null;
-});
-
-describe('helpers', () => {
-  it('helper with complex lookup$', () => {
-    expectTemplate('{{#goodbyes}}{{{link ../prefix}}}{{/goodbyes}}')
-      .withInput({
-        prefix: '/root',
-        goodbyes: [{ text: 'Goodbye', url: 'goodbye' }],
-      })
-      .withHelper('link', function (this: any, prefix) {
-        return '<a href="' + prefix + '/' + this.url + '">' + this.text + '</a>';
-      })
-      .toCompileTo('<a href="/root/goodbye">Goodbye</a>');
-  });
-
-  it('helper for raw block gets raw content', () => {
-    expectTemplate('{{{{raw}}}} {{test}} {{{{/raw}}}}')
-      .withInput({ test: 'hello' })
-      .withHelper('raw', function (options: HelperOptions) {
-        return options.fn();
-      })
-      .toCompileTo(' {{test}} ');
-  });
-
-  it('helper for raw block gets parameters', () => {
-    expectTemplate('{{{{raw 1 2 3}}}} {{test}} {{{{/raw}}}}')
-      .withInput({ test: 'hello' })
-      .withHelper('raw', function (a, b, c, options: HelperOptions) {
-        const ret = options.fn() + a + b + c;
-        return ret;
-      })
-      .toCompileTo(' {{test}} 123');
-  });
-
-  describe('raw block parsing (with identity helper-function)', () => {
-    function runWithIdentityHelper(template: string, expected: string) {
-      expectTemplate(template)
-        .withHelper('identity', function (options: HelperOptions) {
-          return options.fn();
-        })
-        .toCompileTo(expected);
-    }
-
-    it('helper for nested raw block gets raw content', () => {
-      runWithIdentityHelper(
-        '{{{{identity}}}} {{{{b}}}} {{{{/b}}}} {{{{/identity}}}}',
-        ' {{{{b}}}} {{{{/b}}}} '
-      );
-    });
-
-    it('helper for nested raw block works with empty content', () => {
-      runWithIdentityHelper('{{{{identity}}}}{{{{/identity}}}}', '');
-    });
-
-    it.skip('helper for nested raw block works if nested raw blocks are broken', () => {
-      // This test was introduced in 4.4.4, but it was not the actual problem that lead to the patch release
-      // The test is deactivated, because in 3.x this template cases an exception and it also does not work in 4.4.3
-      // If anyone can make this template work without breaking everything else, then go for it,
-      // but for now, this is just a known bug, that will be documented.
-      runWithIdentityHelper(
-        '{{{{identity}}}} {{{{a}}}} {{{{ {{{{/ }}}} }}}} {{{{/identity}}}}',
-        ' {{{{a}}}} {{{{ {{{{/ }}}} }}}} '
-      );
-    });
-
-    it('helper for nested raw block closes after first matching close', () => {
-      runWithIdentityHelper(
-        '{{{{identity}}}}abc{{{{/identity}}}} {{{{identity}}}}abc{{{{/identity}}}}',
-        'abc abc'
-      );
-    });
-
-    it('helper for nested raw block throw exception when with missing closing braces', () => {
-      const string = '{{{{a}}}} {{{{/a';
-      expectTemplate(string).toThrow();
-    });
-  });
-
-  it('helper block with identical context', () => {
-    expectTemplate('{{#goodbyes}}{{name}}{{/goodbyes}}')
-      .withInput({ name: 'Alan' })
-      .withHelper('goodbyes', function (this: any, options: HelperOptions) {
-        let out = '';
-        const byes = ['Goodbye', 'goodbye', 'GOODBYE'];
-        for (let i = 0, j = byes.length; i < j; i++) {
-          out += byes[i] + ' ' + options.fn(this) + '! ';
-        }
-        return out;
-      })
-      .toCompileTo('Goodbye Alan! goodbye Alan! GOODBYE Alan! ');
-  });
-
-  it('helper block with complex lookup expression', () => {
-    expectTemplate('{{#goodbyes}}{{../name}}{{/goodbyes}}')
-      .withInput({ name: 'Alan' })
-      .withHelper('goodbyes', function (options: HelperOptions) {
-        let out = '';
-        const byes = ['Goodbye', 'goodbye', 'GOODBYE'];
-        for (let i = 0, j = byes.length; i < j; i++) {
-          out += byes[i] + ' ' + options.fn({}) + '! ';
-        }
-        return out;
-      })
-      .toCompileTo('Goodbye Alan! goodbye Alan! GOODBYE Alan! ');
-  });
-
-  it('helper with complex lookup and nested template', () => {
-    expectTemplate('{{#goodbyes}}{{#link ../prefix}}{{text}}{{/link}}{{/goodbyes}}')
-      .withInput({
-        prefix: '/root',
-        goodbyes: [{ text: 'Goodbye', url: 'goodbye' }],
-      })
-      .withHelper('link', function (this: any, prefix, options: HelperOptions) {
-        return '<a href="' + prefix + '/' + this.url + '">' + options.fn(this) + '</a>';
-      })
-      .toCompileTo('<a href="/root/goodbye">Goodbye</a>');
-  });
-
-  it('helper with complex lookup and nested template in VM+Compiler', () => {
-    expectTemplate('{{#goodbyes}}{{#link ../prefix}}{{text}}{{/link}}{{/goodbyes}}')
-      .withInput({
-        prefix: '/root',
-        goodbyes: [{ text: 'Goodbye', url: 'goodbye' }],
-      })
-      .withHelper('link', function (this: any, prefix, options: HelperOptions) {
-        return '<a href="' + prefix + '/' + this.url + '">' + options.fn(this) + '</a>';
-      })
-      .toCompileTo('<a href="/root/goodbye">Goodbye</a>');
-  });
-
-  it('helper returning undefined value', () => {
-    expectTemplate(' {{nothere}}')
-      .withHelpers({
-        nothere() {},
-      })
-      .toCompileTo(' ');
-
-    expectTemplate(' {{#nothere}}{{/nothere}}')
-      .withHelpers({
-        nothere() {},
-      })
-      .toCompileTo(' ');
-  });
-
-  it('block helper', () => {
-    expectTemplate('{{#goodbyes}}{{text}}! {{/goodbyes}}cruel {{world}}!')
-      .withInput({ world: 'world' })
-      .withHelper('goodbyes', function (options: HelperOptions) {
-        return options.fn({ text: 'GOODBYE' });
-      })
-      .toCompileTo('GOODBYE! cruel world!');
-  });
-
-  it('block helper staying in the same context', () => {
-    expectTemplate('{{#form}}<p>{{name}}</p>{{/form}}')
-      .withInput({ name: 'Yehuda' })
-      .withHelper('form', function (this: any, options: HelperOptions) {
-        return '<form>' + options.fn(this) + '</form>';
-      })
-      .toCompileTo('<form><p>Yehuda</p></form>');
-  });
-
-  it('block helper should have context in this', () => {
-    function link(this: any, options: HelperOptions) {
-      return '<a href="/people/' + this.id + '">' + options.fn(this) + '</a>';
-    }
-
-    expectTemplate('<ul>{{#people}}<li>{{#link}}{{name}}{{/link}}</li>{{/people}}</ul>')
-      .withInput({
-        people: [
-          { name: 'Alan', id: 1 },
-          { name: 'Yehuda', id: 2 },
-        ],
-      })
-      .withHelper('link', link)
-      .toCompileTo(
-        '<ul><li><a href="/people/1">Alan</a></li><li><a href="/people/2">Yehuda</a></li></ul>'
-      );
-  });
-
-  it('block helper for undefined value', () => {
-    expectTemplate("{{#empty}}shouldn't render{{/empty}}").toCompileTo('');
-  });
-
-  it('block helper passing a new context', () => {
-    expectTemplate('{{#form yehuda}}<p>{{name}}</p>{{/form}}')
-      .withInput({ yehuda: { name: 'Yehuda' } })
-      .withHelper('form', function (context, options: HelperOptions) {
-        return '<form>' + options.fn(context) + '</form>';
-      })
-      .toCompileTo('<form><p>Yehuda</p></form>');
-  });
-
-  it('block helper passing a complex path context', () => {
-    expectTemplate('{{#form yehuda/cat}}<p>{{name}}</p>{{/form}}')
-      .withInput({ yehuda: { name: 'Yehuda', cat: { name: 'Harold' } } })
-      .withHelper('form', function (context, options: HelperOptions) {
-        return '<form>' + options.fn(context) + '</form>';
-      })
-      .toCompileTo('<form><p>Harold</p></form>');
-  });
-
-  it('nested block helpers', () => {
-    expectTemplate('{{#form yehuda}}<p>{{name}}</p>{{#link}}Hello{{/link}}{{/form}}')
-      .withInput({
-        yehuda: { name: 'Yehuda' },
-      })
-      .withHelper('link', function (this: any, options: HelperOptions) {
-        return '<a href="' + this.name + '">' + options.fn(this) + '</a>';
-      })
-      .withHelper('form', function (context, options: HelperOptions) {
-        return '<form>' + options.fn(context) + '</form>';
-      })
-      .toCompileTo('<form><p>Yehuda</p><a href="Yehuda">Hello</a></form>');
-  });
-
-  it('block helper inverted sections', () => {
-    const string = "{{#list people}}{{name}}{{^}}<em>Nobody's here</em>{{/list}}";
-    function list(this: any, context: any, options: HelperOptions) {
-      if (context.length > 0) {
-        let out = '<ul>';
-        for (let i = 0, j = context.length; i < j; i++) {
-          out += '<li>';
-          out += options.fn(context[i]);
-          out += '</li>';
-        }
-        out += '</ul>';
-        return out;
-      } else {
-        return '<p>' + options.inverse(this) + '</p>';
-      }
-    }
-
-    // the meaning here may be kind of hard to catch, but list.not is always called,
-    // so we should see the output of both
-    expectTemplate(string)
-      .withInput({ people: [{ name: 'Alan' }, { name: 'Yehuda' }] })
-      .withHelpers({ list })
-      .toCompileTo('<ul><li>Alan</li><li>Yehuda</li></ul>');
-
-    expectTemplate(string)
-      .withInput({ people: [] })
-      .withHelpers({ list })
-      .toCompileTo("<p><em>Nobody's here</em></p>");
-
-    expectTemplate('{{#list people}}Hello{{^}}{{message}}{{/list}}')
-      .withInput({
-        people: [],
-        message: "Nobody's here",
-      })
-      .withHelpers({ list })
-      .toCompileTo('<p>Nobody&#x27;s here</p>');
-  });
-
-  it('pathed lambas with parameters', () => {
-    const hash = {
-      helper: () => 'winning',
-    };
-    // @ts-expect-error
-    hash.hash = hash;
-
-    const helpers = {
-      './helper': () => 'fail',
-    };
-
-    expectTemplate('{{./helper 1}}').withInput(hash).withHelpers(helpers).toCompileTo('winning');
-    expectTemplate('{{hash/helper 1}}').withInput(hash).withHelpers(helpers).toCompileTo('winning');
-  });
-
-  describe('helpers hash', () => {
-    it('providing a helpers hash', () => {
-      expectTemplate('Goodbye {{cruel}} {{world}}!')
-        .withInput({ cruel: 'cruel' })
-        .withHelpers({
-          world() {
-            return 'world';
-          },
-        })
-        .toCompileTo('Goodbye cruel world!');
-
-      expectTemplate('Goodbye {{#iter}}{{cruel}} {{world}}{{/iter}}!')
-        .withInput({ iter: [{ cruel: 'cruel' }] })
-        .withHelpers({
-          world() {
-            return 'world';
-          },
-        })
-        .toCompileTo('Goodbye cruel world!');
-    });
-
-    it('in cases of conflict, helpers win', () => {
-      expectTemplate('{{{lookup}}}')
-        .withInput({ lookup: 'Explicit' })
-        .withHelpers({
-          lookup() {
-            return 'helpers';
-          },
-        })
-        .toCompileTo('helpers');
-
-      expectTemplate('{{lookup}}')
-        .withInput({ lookup: 'Explicit' })
-        .withHelpers({
-          lookup() {
-            return 'helpers';
-          },
-        })
-        .toCompileTo('helpers');
-    });
-
-    it('the helpers hash is available is nested contexts', () => {
-      expectTemplate('{{#outer}}{{#inner}}{{helper}}{{/inner}}{{/outer}}')
-        .withInput({ outer: { inner: { unused: [] } } })
-        .withHelpers({
-          helper() {
-            return 'helper';
-          },
-        })
-        .toCompileTo('helper');
-    });
-
-    it('the helper hash should augment the global hash', () => {
-      kbnHandlebarsEnv!.registerHelper('test_helper', function () {
-        return 'found it!';
-      });
-
-      expectTemplate('{{test_helper}} {{#if cruel}}Goodbye {{cruel}} {{world}}!{{/if}}')
-        .withInput({ cruel: 'cruel' })
-        .withHelpers({
-          world() {
-            return 'world!';
-          },
-        })
-        .toCompileTo('found it! Goodbye cruel world!!');
-    });
-  });
-
-  describe('registration', () => {
-    it('unregisters', () => {
-      deleteAllKeys(kbnHandlebarsEnv!.helpers);
-
-      kbnHandlebarsEnv!.registerHelper('foo', function () {
-        return 'fail';
-      });
-      expect(kbnHandlebarsEnv!.helpers.foo).toBeDefined();
-      kbnHandlebarsEnv!.unregisterHelper('foo');
-      expect(kbnHandlebarsEnv!.helpers.foo).toBeUndefined();
-    });
-
-    it('allows multiple globals', () => {
-      const ifHelper = kbnHandlebarsEnv!.helpers.if;
-      deleteAllKeys(kbnHandlebarsEnv!.helpers);
-
-      kbnHandlebarsEnv!.registerHelper({
-        if: ifHelper,
-        world() {
-          return 'world!';
-        },
-        testHelper() {
-          return 'found it!';
-        },
-      });
-
-      expectTemplate('{{testHelper}} {{#if cruel}}Goodbye {{cruel}} {{world}}!{{/if}}')
-        .withInput({ cruel: 'cruel' })
-        .toCompileTo('found it! Goodbye cruel world!!');
-    });
-
-    it('fails with multiple and args', () => {
-      expect(() => {
-        kbnHandlebarsEnv!.registerHelper(
-          // @ts-expect-error TypeScript is complaining about the invalid input just as the thrown error
-          {
-            world() {
-              return 'world!';
-            },
-            testHelper() {
-              return 'found it!';
-            },
-          },
-          {}
-        );
-      }).toThrow('Arg not supported with multiple helpers');
-    });
-  });
-
-  it('decimal number literals work', () => {
-    expectTemplate('Message: {{hello -1.2 1.2}}')
-      .withHelper('hello', function (times, times2) {
-        if (typeof times !== 'number') {
-          times = 'NaN';
-        }
-        if (typeof times2 !== 'number') {
-          times2 = 'NaN';
-        }
-        return 'Hello ' + times + ' ' + times2 + ' times';
-      })
-      .toCompileTo('Message: Hello -1.2 1.2 times');
-  });
-
-  it('negative number literals work', () => {
-    expectTemplate('Message: {{hello -12}}')
-      .withHelper('hello', function (times) {
-        if (typeof times !== 'number') {
-          times = 'NaN';
-        }
-        return 'Hello ' + times + ' times';
-      })
-      .toCompileTo('Message: Hello -12 times');
-  });
-
-  describe('String literal parameters', () => {
-    it('simple literals work', () => {
-      expectTemplate('Message: {{hello "world" 12 true false}}')
-        .withHelper('hello', function (param, times, bool1, bool2) {
-          if (typeof times !== 'number') {
-            times = 'NaN';
-          }
-          if (typeof bool1 !== 'boolean') {
-            bool1 = 'NaB';
-          }
-          if (typeof bool2 !== 'boolean') {
-            bool2 = 'NaB';
-          }
-          return 'Hello ' + param + ' ' + times + ' times: ' + bool1 + ' ' + bool2;
-        })
-        .toCompileTo('Message: Hello world 12 times: true false');
-    });
-
-    it('using a quote in the middle of a parameter raises an error', () => {
-      expectTemplate('Message: {{hello wo"rld"}}').toThrow(Error);
-    });
-
-    it('escaping a String is possible', () => {
-      expectTemplate('Message: {{{hello "\\"world\\""}}}')
-        .withHelper('hello', function (param) {
-          return 'Hello ' + param;
-        })
-        .toCompileTo('Message: Hello "world"');
-    });
-
-    it("it works with ' marks", () => {
-      expectTemplate('Message: {{{hello "Alan\'s world"}}}')
-        .withHelper('hello', function (param) {
-          return 'Hello ' + param;
-        })
-        .toCompileTo("Message: Hello Alan's world");
-    });
-  });
-
-  describe('multiple parameters', () => {
-    it('simple multi-params work', () => {
-      expectTemplate('Message: {{goodbye cruel world}}')
-        .withInput({ cruel: 'cruel', world: 'world' })
-        .withHelper('goodbye', function (cruel, world) {
-          return 'Goodbye ' + cruel + ' ' + world;
-        })
-        .toCompileTo('Message: Goodbye cruel world');
-    });
-
-    it('block multi-params work', () => {
-      expectTemplate('Message: {{#goodbye cruel world}}{{greeting}} {{adj}} {{noun}}{{/goodbye}}')
-        .withInput({ cruel: 'cruel', world: 'world' })
-        .withHelper('goodbye', function (cruel, world, options: HelperOptions) {
-          return options.fn({ greeting: 'Goodbye', adj: cruel, noun: world });
-        })
-        .toCompileTo('Message: Goodbye cruel world');
-    });
-  });
-
-  describe('hash', () => {
-    it('helpers can take an optional hash', () => {
-      expectTemplate('{{goodbye cruel="CRUEL" world="WORLD" times=12}}')
-        .withHelper('goodbye', function (options: HelperOptions) {
-          return (
-            'GOODBYE ' +
-            options.hash.cruel +
-            ' ' +
-            options.hash.world +
-            ' ' +
-            options.hash.times +
-            ' TIMES'
-          );
-        })
-        .toCompileTo('GOODBYE CRUEL WORLD 12 TIMES');
-    });
-
-    it('helpers can take an optional hash with booleans', () => {
-      function goodbye(options: HelperOptions) {
-        if (options.hash.print === true) {
-          return 'GOODBYE ' + options.hash.cruel + ' ' + options.hash.world;
-        } else if (options.hash.print === false) {
-          return 'NOT PRINTING';
-        } else {
-          return 'THIS SHOULD NOT HAPPEN';
-        }
-      }
-
-      expectTemplate('{{goodbye cruel="CRUEL" world="WORLD" print=true}}')
-        .withHelper('goodbye', goodbye)
-        .toCompileTo('GOODBYE CRUEL WORLD');
-
-      expectTemplate('{{goodbye cruel="CRUEL" world="WORLD" print=false}}')
-        .withHelper('goodbye', goodbye)
-        .toCompileTo('NOT PRINTING');
-    });
-
-    it('block helpers can take an optional hash', () => {
-      expectTemplate('{{#goodbye cruel="CRUEL" times=12}}world{{/goodbye}}')
-        .withHelper('goodbye', function (this: any, options: HelperOptions) {
-          return (
-            'GOODBYE ' +
-            options.hash.cruel +
-            ' ' +
-            options.fn(this) +
-            ' ' +
-            options.hash.times +
-            ' TIMES'
-          );
-        })
-        .toCompileTo('GOODBYE CRUEL world 12 TIMES');
-    });
-
-    it('block helpers can take an optional hash with single quoted stings', () => {
-      expectTemplate('{{#goodbye cruel="CRUEL" times=12}}world{{/goodbye}}')
-        .withHelper('goodbye', function (this: any, options: HelperOptions) {
-          return (
-            'GOODBYE ' +
-            options.hash.cruel +
-            ' ' +
-            options.fn(this) +
-            ' ' +
-            options.hash.times +
-            ' TIMES'
-          );
-        })
-        .toCompileTo('GOODBYE CRUEL world 12 TIMES');
-    });
-
-    it('block helpers can take an optional hash with booleans', () => {
-      function goodbye(this: any, options: HelperOptions) {
-        if (options.hash.print === true) {
-          return 'GOODBYE ' + options.hash.cruel + ' ' + options.fn(this);
-        } else if (options.hash.print === false) {
-          return 'NOT PRINTING';
-        } else {
-          return 'THIS SHOULD NOT HAPPEN';
-        }
-      }
-
-      expectTemplate('{{#goodbye cruel="CRUEL" print=true}}world{{/goodbye}}')
-        .withHelper('goodbye', goodbye)
-        .toCompileTo('GOODBYE CRUEL world');
-
-      expectTemplate('{{#goodbye cruel="CRUEL" print=false}}world{{/goodbye}}')
-        .withHelper('goodbye', goodbye)
-        .toCompileTo('NOT PRINTING');
-    });
-  });
-
-  describe('helperMissing', () => {
-    it('if a context is not found, helperMissing is used', () => {
-      expectTemplate('{{hello}} {{link_to world}}').toThrow(/Missing helper: "link_to"/);
-    });
-
-    it('if a context is not found, custom helperMissing is used', () => {
-      expectTemplate('{{hello}} {{link_to world}}')
-        .withInput({ hello: 'Hello', world: 'world' })
-        .withHelper('helperMissing', function (mesg, options: HelperOptions) {
-          if (options.name === 'link_to') {
-            return new Handlebars.SafeString('<a>' + mesg + '</a>');
-          }
-        })
-        .toCompileTo('Hello <a>world</a>');
-    });
-
-    it('if a value is not found, custom helperMissing is used', () => {
-      expectTemplate('{{hello}} {{link_to}}')
-        .withInput({ hello: 'Hello', world: 'world' })
-        .withHelper('helperMissing', function (options: HelperOptions) {
-          if (options.name === 'link_to') {
-            return new Handlebars.SafeString('<a>winning</a>');
-          }
-        })
-        .toCompileTo('Hello <a>winning</a>');
-    });
-  });
-
-  describe('knownHelpers', () => {
-    it('Known helper should render helper', () => {
-      expectTemplate('{{hello}}')
-        .withCompileOptions({
-          knownHelpers: { hello: true },
-        })
-        .withHelper('hello', function () {
-          return 'foo';
-        })
-        .toCompileTo('foo');
-    });
-
-    it('Unknown helper in knownHelpers only mode should be passed as undefined', () => {
-      expectTemplate('{{typeof hello}}')
-        .withCompileOptions({
-          knownHelpers: { typeof: true },
-          knownHelpersOnly: true,
-        })
-        .withHelper('typeof', function (arg) {
-          return typeof arg;
-        })
-        .withHelper('hello', function () {
-          return 'foo';
-        })
-        .toCompileTo('undefined');
-    });
-
-    it('Builtin helpers available in knownHelpers only mode', () => {
-      expectTemplate('{{#unless foo}}bar{{/unless}}')
-        .withCompileOptions({
-          knownHelpersOnly: true,
-        })
-        .toCompileTo('bar');
-    });
-
-    it('Field lookup works in knownHelpers only mode', () => {
-      expectTemplate('{{foo}}')
-        .withCompileOptions({
-          knownHelpersOnly: true,
-        })
-        .withInput({ foo: 'bar' })
-        .toCompileTo('bar');
-    });
-
-    it('Conditional blocks work in knownHelpers only mode', () => {
-      expectTemplate('{{#foo}}bar{{/foo}}')
-        .withCompileOptions({
-          knownHelpersOnly: true,
-        })
-        .withInput({ foo: 'baz' })
-        .toCompileTo('bar');
-    });
-
-    it('Invert blocks work in knownHelpers only mode', () => {
-      expectTemplate('{{^foo}}bar{{/foo}}')
-        .withCompileOptions({
-          knownHelpersOnly: true,
-        })
-        .withInput({ foo: false })
-        .toCompileTo('bar');
-    });
-
-    it('Functions are bound to the context in knownHelpers only mode', () => {
-      expectTemplate('{{foo}}')
-        .withCompileOptions({
-          knownHelpersOnly: true,
-        })
-        .withInput({
-          foo() {
-            return this.bar;
-          },
-          bar: 'bar',
-        })
-        .toCompileTo('bar');
-    });
-
-    it('Unknown helper call in knownHelpers only mode should throw', () => {
-      expectTemplate('{{typeof hello}}')
-        .withCompileOptions({ knownHelpersOnly: true })
-        .toThrow(Error);
-    });
-  });
-
-  describe('blockHelperMissing', () => {
-    it('lambdas are resolved by blockHelperMissing, not handlebars proper', () => {
-      expectTemplate('{{#truthy}}yep{{/truthy}}')
-        .withInput({
-          truthy() {
-            return true;
-          },
-        })
-        .toCompileTo('yep');
-    });
-
-    it('lambdas resolved by blockHelperMissing are bound to the context', () => {
-      expectTemplate('{{#truthy}}yep{{/truthy}}')
-        .withInput({
-          truthy() {
-            return this.truthiness();
-          },
-          truthiness() {
-            return false;
-          },
-        })
-        .toCompileTo('');
-    });
-  });
-
-  describe('name field', () => {
-    const helpers = {
-      blockHelperMissing(...args: any[]) {
-        return 'missing: ' + args[args.length - 1].name;
-      },
-      helperMissing(...args: any[]) {
-        return 'helper missing: ' + args[args.length - 1].name;
-      },
-      helper(...args: any[]) {
-        return 'ran: ' + args[args.length - 1].name;
-      },
-    };
-
-    it('should include in ambiguous mustache calls', () => {
-      expectTemplate('{{helper}}').withHelpers(helpers).toCompileTo('ran: helper');
-    });
-
-    it('should include in helper mustache calls', () => {
-      expectTemplate('{{helper 1}}').withHelpers(helpers).toCompileTo('ran: helper');
-    });
-
-    it('should include in ambiguous block calls', () => {
-      expectTemplate('{{#helper}}{{/helper}}').withHelpers(helpers).toCompileTo('ran: helper');
-    });
-
-    it('should include in simple block calls', () => {
-      expectTemplate('{{#./helper}}{{/./helper}}')
-        .withHelpers(helpers)
-        .toCompileTo('missing: ./helper');
-    });
-
-    it('should include in helper block calls', () => {
-      expectTemplate('{{#helper 1}}{{/helper}}').withHelpers(helpers).toCompileTo('ran: helper');
-    });
-
-    it('should include in known helper calls', () => {
-      expectTemplate('{{helper}}')
-        .withCompileOptions({
-          knownHelpers: { helper: true },
-          knownHelpersOnly: true,
-        })
-        .withHelpers(helpers)
-        .toCompileTo('ran: helper');
-    });
-
-    it('should include full id', () => {
-      expectTemplate('{{#foo.helper}}{{/foo.helper}}')
-        .withInput({ foo: {} })
-        .withHelpers(helpers)
-        .toCompileTo('missing: foo.helper');
-    });
-
-    it('should include full id if a hash is passed', () => {
-      expectTemplate('{{#foo.helper bar=baz}}{{/foo.helper}}')
-        .withInput({ foo: {} })
-        .withHelpers(helpers)
-        .toCompileTo('helper missing: foo.helper');
-    });
-  });
-
-  describe('name conflicts', () => {
-    it('helpers take precedence over same-named context properties', () => {
-      expectTemplate('{{goodbye}} {{cruel world}}')
-        .withHelper('goodbye', function (this: any) {
-          return this.goodbye.toUpperCase();
-        })
-        .withHelper('cruel', function (world) {
-          return 'cruel ' + world.toUpperCase();
-        })
-        .withInput({
-          goodbye: 'goodbye',
-          world: 'world',
-        })
-        .toCompileTo('GOODBYE cruel WORLD');
-    });
-
-    it('helpers take precedence over same-named context properties$', () => {
-      expectTemplate('{{#goodbye}} {{cruel world}}{{/goodbye}}')
-        .withHelper('goodbye', function (this: any, options: HelperOptions) {
-          return this.goodbye.toUpperCase() + options.fn(this);
-        })
-        .withHelper('cruel', function (world) {
-          return 'cruel ' + world.toUpperCase();
-        })
-        .withInput({
-          goodbye: 'goodbye',
-          world: 'world',
-        })
-        .toCompileTo('GOODBYE cruel WORLD');
-    });
-
-    it('Scoped names take precedence over helpers', () => {
-      expectTemplate('{{this.goodbye}} {{cruel world}} {{cruel this.goodbye}}')
-        .withHelper('goodbye', function (this: any) {
-          return this.goodbye.toUpperCase();
-        })
-        .withHelper('cruel', function (world) {
-          return 'cruel ' + world.toUpperCase();
-        })
-        .withInput({
-          goodbye: 'goodbye',
-          world: 'world',
-        })
-        .toCompileTo('goodbye cruel WORLD cruel GOODBYE');
-    });
-
-    it('Scoped names take precedence over block helpers', () => {
-      expectTemplate('{{#goodbye}} {{cruel world}}{{/goodbye}} {{this.goodbye}}')
-        .withHelper('goodbye', function (this: any, options: HelperOptions) {
-          return this.goodbye.toUpperCase() + options.fn(this);
-        })
-        .withHelper('cruel', function (world) {
-          return 'cruel ' + world.toUpperCase();
-        })
-        .withInput({
-          goodbye: 'goodbye',
-          world: 'world',
-        })
-        .toCompileTo('GOODBYE cruel WORLD goodbye');
-    });
-  });
-
-  describe('block params', () => {
-    it('should take presedence over context values', () => {
-      expectTemplate('{{#goodbyes as |value|}}{{value}}{{/goodbyes}}{{value}}')
-        .withInput({ value: 'foo' })
-        .withHelper('goodbyes', function (options: HelperOptions) {
-          expect(options.fn.blockParams).toEqual(1);
-          return options.fn({ value: 'bar' }, { blockParams: [1, 2] });
-        })
-        .toCompileTo('1foo');
-    });
-
-    it('should take presedence over helper values', () => {
-      expectTemplate('{{#goodbyes as |value|}}{{value}}{{/goodbyes}}{{value}}')
-        .withHelper('value', function () {
-          return 'foo';
-        })
-        .withHelper('goodbyes', function (options: HelperOptions) {
-          expect(options.fn.blockParams).toEqual(1);
-          return options.fn({}, { blockParams: [1, 2] });
-        })
-        .toCompileTo('1foo');
-    });
-
-    it('should not take presedence over pathed values', () => {
-      expectTemplate('{{#goodbyes as |value|}}{{./value}}{{/goodbyes}}{{value}}')
-        .withInput({ value: 'bar' })
-        .withHelper('value', function () {
-          return 'foo';
-        })
-        .withHelper('goodbyes', function (this: any, options: HelperOptions) {
-          expect(options.fn.blockParams).toEqual(1);
-          return options.fn(this, { blockParams: [1, 2] });
-        })
-        .toCompileTo('barfoo');
-    });
-
-    it('should take presednece over parent block params', () => {
-      let value: number;
-      expectTemplate(
-        '{{#goodbyes as |value|}}{{#goodbyes}}{{value}}{{#goodbyes as |value|}}{{value}}{{/goodbyes}}{{/goodbyes}}{{/goodbyes}}{{value}}',
-        {
-          beforeEach() {
-            value = 1;
-          },
-        }
-      )
-        .withInput({ value: 'foo' })
-        .withHelper('goodbyes', function (options: HelperOptions) {
-          return options.fn(
-            { value: 'bar' },
-            {
-              blockParams: options.fn.blockParams === 1 ? [value++, value++] : undefined,
-            }
-          );
-        })
-        .toCompileTo('13foo');
-    });
-
-    it('should allow block params on chained helpers', () => {
-      expectTemplate('{{#if bar}}{{else goodbyes as |value|}}{{value}}{{/if}}{{value}}')
-        .withInput({ value: 'foo' })
-        .withHelper('goodbyes', function (options: HelperOptions) {
-          expect(options.fn.blockParams).toEqual(1);
-          return options.fn({ value: 'bar' }, { blockParams: [1, 2] });
-        })
-        .toCompileTo('1foo');
-    });
-  });
-
-  describe('built-in helpers malformed arguments ', () => {
-    it('if helper - too few arguments', () => {
-      expectTemplate('{{#if}}{{/if}}').toThrow(/#if requires exactly one argument/);
-    });
-
-    it('if helper - too many arguments, string', () => {
-      expectTemplate('{{#if test "string"}}{{/if}}').toThrow(/#if requires exactly one argument/);
-    });
-
-    it('if helper - too many arguments, undefined', () => {
-      expectTemplate('{{#if test undefined}}{{/if}}').toThrow(/#if requires exactly one argument/);
-    });
-
-    it('if helper - too many arguments, null', () => {
-      expectTemplate('{{#if test null}}{{/if}}').toThrow(/#if requires exactly one argument/);
-    });
-
-    it('unless helper - too few arguments', () => {
-      expectTemplate('{{#unless}}{{/unless}}').toThrow(/#unless requires exactly one argument/);
-    });
-
-    it('unless helper - too many arguments', () => {
-      expectTemplate('{{#unless test null}}{{/unless}}').toThrow(
-        /#unless requires exactly one argument/
-      );
-    });
-
-    it('with helper - too few arguments', () => {
-      expectTemplate('{{#with}}{{/with}}').toThrow(/#with requires exactly one argument/);
-    });
-
-    it('with helper - too many arguments', () => {
-      expectTemplate('{{#with test "string"}}{{/with}}').toThrow(
-        /#with requires exactly one argument/
-      );
-    });
-  });
-
-  describe('the lookupProperty-option', () => {
-    it('should be passed to custom helpers', () => {
-      expectTemplate('{{testHelper}}')
-        .withHelper('testHelper', function testHelper(this: any, options: HelperOptions) {
-          return options.lookupProperty(this, 'testProperty');
-        })
-        .withInput({ testProperty: 'abc' })
-        .toCompileTo('abc');
-    });
-  });
-});
-
-function deleteAllKeys(obj: { [key: string]: any }) {
-  for (const key of Object.keys(obj)) {
-    delete obj[key];
-  }
-}
diff --git a/dev/lib/handlebars/src/spec/index.partials.test.ts b/dev/lib/handlebars/src/spec/index.partials.test.ts
deleted file mode 100644
index 65930d06..00000000
--- a/dev/lib/handlebars/src/spec/index.partials.test.ts
+++ /dev/null
@@ -1,591 +0,0 @@
-/*
- * This file is forked from the handlebars project (https://github.com/handlebars-lang/handlebars.js),
- * and may include modifications made by Elasticsearch B.V.
- * Elasticsearch B.V. licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import Handlebars from '../..';
-import { expectTemplate, forEachCompileFunctionName } from '../__jest__/test_bench';
-
-describe('partials', () => {
-  it('basic partials', () => {
-    const string = 'Dudes: {{#dudes}}{{> dude}}{{/dudes}}';
-    const partial = '{{name}} ({{url}}) ';
-    const hash = {
-      dudes: [
-        { name: 'Yehuda', url: 'http://yehuda' },
-        { name: 'Alan', url: 'http://alan' },
-      ],
-    };
-
-    expectTemplate(string)
-      .withInput(hash)
-      .withPartials({ dude: partial })
-      .toCompileTo('Dudes: Yehuda (http://yehuda) Alan (http://alan) ');
-
-    expectTemplate(string)
-      .withInput(hash)
-      .withPartials({ dude: partial })
-      .withRuntimeOptions({ data: false })
-      .withCompileOptions({ data: false })
-      .toCompileTo('Dudes: Yehuda (http://yehuda) Alan (http://alan) ');
-  });
-
-  it('dynamic partials', () => {
-    const string = 'Dudes: {{#dudes}}{{> (partial)}}{{/dudes}}';
-    const partial = '{{name}} ({{url}}) ';
-    const hash = {
-      dudes: [
-        { name: 'Yehuda', url: 'http://yehuda' },
-        { name: 'Alan', url: 'http://alan' },
-      ],
-    };
-    const helpers = {
-      partial: () => 'dude',
-    };
-
-    expectTemplate(string)
-      .withInput(hash)
-      .withHelpers(helpers)
-      .withPartials({ dude: partial })
-      .toCompileTo('Dudes: Yehuda (http://yehuda) Alan (http://alan) ');
-
-    expectTemplate(string)
-      .withInput(hash)
-      .withHelpers(helpers)
-      .withPartials({ dude: partial })
-      .withRuntimeOptions({ data: false })
-      .withCompileOptions({ data: false })
-      .toCompileTo('Dudes: Yehuda (http://yehuda) Alan (http://alan) ');
-  });
-
-  it('failing dynamic partials', () => {
-    expectTemplate('Dudes: {{#dudes}}{{> (partial)}}{{/dudes}}')
-      .withInput({
-        dudes: [
-          { name: 'Yehuda', url: 'http://yehuda' },
-          { name: 'Alan', url: 'http://alan' },
-        ],
-      })
-      .withHelper('partial', () => 'missing')
-      .withPartial('dude', '{{name}} ({{url}}) ')
-      .toThrow('The partial missing could not be found'); // TODO: Is there a way we can test that the error is of type `Handlebars.Exception`?
-  });
-
-  it('partials with context', () => {
-    expectTemplate('Dudes: {{>dude dudes}}')
-      .withInput({
-        dudes: [
-          { name: 'Yehuda', url: 'http://yehuda' },
-          { name: 'Alan', url: 'http://alan' },
-        ],
-      })
-      .withPartial('dude', '{{#this}}{{name}} ({{url}}) {{/this}}')
-      .toCompileTo('Dudes: Yehuda (http://yehuda) Alan (http://alan) ');
-  });
-
-  it('partials with no context', () => {
-    const partial = '{{name}} ({{url}}) ';
-    const hash = {
-      dudes: [
-        { name: 'Yehuda', url: 'http://yehuda' },
-        { name: 'Alan', url: 'http://alan' },
-      ],
-    };
-
-    expectTemplate('Dudes: {{#dudes}}{{>dude}}{{/dudes}}')
-      .withInput(hash)
-      .withPartial('dude', partial)
-      .withCompileOptions({ explicitPartialContext: true })
-      .toCompileTo('Dudes:  ()  () ');
-
-    expectTemplate('Dudes: {{#dudes}}{{>dude name="foo"}}{{/dudes}}')
-      .withInput(hash)
-      .withPartial('dude', partial)
-      .withCompileOptions({ explicitPartialContext: true })
-      .toCompileTo('Dudes: foo () foo () ');
-  });
-
-  it('partials with string context', () => {
-    expectTemplate('Dudes: {{>dude "dudes"}}')
-      .withPartial('dude', '{{.}}')
-      .toCompileTo('Dudes: dudes');
-  });
-
-  it('partials with undefined context', () => {
-    expectTemplate('Dudes: {{>dude dudes}}')
-      .withPartial('dude', '{{foo}} Empty')
-      .toCompileTo('Dudes:  Empty');
-  });
-
-  it('partials with duplicate parameters', () => {
-    expectTemplate('Dudes: {{>dude dudes foo bar=baz}}').toThrow(
-      'Unsupported number of partial arguments: 2 - 1:7'
-    );
-  });
-
-  it('partials with parameters', () => {
-    expectTemplate('Dudes: {{#dudes}}{{> dude others=..}}{{/dudes}}')
-      .withInput({
-        foo: 'bar',
-        dudes: [
-          { name: 'Yehuda', url: 'http://yehuda' },
-          { name: 'Alan', url: 'http://alan' },
-        ],
-      })
-      .withPartial('dude', '{{others.foo}}{{name}} ({{url}}) ')
-      .toCompileTo('Dudes: barYehuda (http://yehuda) barAlan (http://alan) ');
-  });
-
-  it('partial in a partial', () => {
-    expectTemplate('Dudes: {{#dudes}}{{>dude}}{{/dudes}}')
-      .withInput({
-        dudes: [
-          { name: 'Yehuda', url: 'http://yehuda' },
-          { name: 'Alan', url: 'http://alan' },
-        ],
-      })
-      .withPartials({
-        dude: '{{name}} {{> url}} ',
-        url: '<a href="{{url}}">{{url}}</a>',
-      })
-      .toCompileTo(
-        'Dudes: Yehuda <a href="http://yehuda">http://yehuda</a> Alan <a href="http://alan">http://alan</a> '
-      );
-  });
-
-  it('rendering undefined partial throws an exception', () => {
-    expectTemplate('{{> whatever}}').toThrow('The partial whatever could not be found');
-  });
-
-  it('registering undefined partial throws an exception', () => {
-    global.kbnHandlebarsEnv = Handlebars.create();
-
-    expect(() => {
-      kbnHandlebarsEnv!.registerPartial('undefined_test', undefined as any);
-    }).toThrow('Attempting to register a partial called "undefined_test" as undefined');
-
-    global.kbnHandlebarsEnv = null;
-  });
-
-  it('rendering template partial in vm mode throws an exception', () => {
-    expectTemplate('{{> whatever}}').toThrow('The partial whatever could not be found');
-  });
-
-  it('rendering function partial in vm mode', () => {
-    function partial(context: any) {
-      return context.name + ' (' + context.url + ') ';
-    }
-    expectTemplate('Dudes: {{#dudes}}{{> dude}}{{/dudes}}')
-      .withInput({
-        dudes: [
-          { name: 'Yehuda', url: 'http://yehuda' },
-          { name: 'Alan', url: 'http://alan' },
-        ],
-      })
-      .withPartial('dude', partial)
-      .toCompileTo('Dudes: Yehuda (http://yehuda) Alan (http://alan) ');
-  });
-
-  it('GH-14: a partial preceding a selector', () => {
-    expectTemplate('Dudes: {{>dude}} {{anotherDude}}')
-      .withInput({ name: 'Jeepers', anotherDude: 'Creepers' })
-      .withPartial('dude', '{{name}}')
-      .toCompileTo('Dudes: Jeepers Creepers');
-  });
-
-  it('Partials with slash paths', () => {
-    expectTemplate('Dudes: {{> shared/dude}}')
-      .withInput({ name: 'Jeepers', anotherDude: 'Creepers' })
-      .withPartial('shared/dude', '{{name}}')
-      .toCompileTo('Dudes: Jeepers');
-  });
-
-  it('Partials with slash and point paths', () => {
-    expectTemplate('Dudes: {{> shared/dude.thing}}')
-      .withInput({ name: 'Jeepers', anotherDude: 'Creepers' })
-      .withPartial('shared/dude.thing', '{{name}}')
-      .toCompileTo('Dudes: Jeepers');
-  });
-
-  it('Global Partials', () => {
-    global.kbnHandlebarsEnv = Handlebars.create();
-
-    kbnHandlebarsEnv!.registerPartial('globalTest', '{{anotherDude}}');
-
-    expectTemplate('Dudes: {{> shared/dude}} {{> globalTest}}')
-      .withInput({ name: 'Jeepers', anotherDude: 'Creepers' })
-      .withPartial('shared/dude', '{{name}}')
-      .toCompileTo('Dudes: Jeepers Creepers');
-
-    kbnHandlebarsEnv!.unregisterPartial('globalTest');
-    expect(kbnHandlebarsEnv!.partials.globalTest).toBeUndefined();
-
-    global.kbnHandlebarsEnv = null;
-  });
-
-  it('Multiple partial registration', () => {
-    global.kbnHandlebarsEnv = Handlebars.create();
-
-    kbnHandlebarsEnv!.registerPartial({
-      'shared/dude': '{{name}}',
-      globalTest: '{{anotherDude}}',
-    });
-
-    expectTemplate('Dudes: {{> shared/dude}} {{> globalTest}}')
-      .withInput({ name: 'Jeepers', anotherDude: 'Creepers' })
-      .withPartial('notused', 'notused') // trick the test bench into running with partials enabled
-      .toCompileTo('Dudes: Jeepers Creepers');
-
-    global.kbnHandlebarsEnv = null;
-  });
-
-  it('Partials with integer path', () => {
-    expectTemplate('Dudes: {{> 404}}')
-      .withInput({ name: 'Jeepers', anotherDude: 'Creepers' })
-      .withPartial(404, '{{name}}')
-      .toCompileTo('Dudes: Jeepers');
-  });
-
-  it('Partials with complex path', () => {
-    expectTemplate('Dudes: {{> 404/asdf?.bar}}')
-      .withInput({ name: 'Jeepers', anotherDude: 'Creepers' })
-      .withPartial('404/asdf?.bar', '{{name}}')
-      .toCompileTo('Dudes: Jeepers');
-  });
-
-  it('Partials with escaped', () => {
-    expectTemplate('Dudes: {{> [+404/asdf?.bar]}}')
-      .withInput({ name: 'Jeepers', anotherDude: 'Creepers' })
-      .withPartial('+404/asdf?.bar', '{{name}}')
-      .toCompileTo('Dudes: Jeepers');
-  });
-
-  it('Partials with string', () => {
-    expectTemplate("Dudes: {{> '+404/asdf?.bar'}}")
-      .withInput({ name: 'Jeepers', anotherDude: 'Creepers' })
-      .withPartial('+404/asdf?.bar', '{{name}}')
-      .toCompileTo('Dudes: Jeepers');
-  });
-
-  it('should handle empty partial', () => {
-    expectTemplate('Dudes: {{#dudes}}{{> dude}}{{/dudes}}')
-      .withInput({
-        dudes: [
-          { name: 'Yehuda', url: 'http://yehuda' },
-          { name: 'Alan', url: 'http://alan' },
-        ],
-      })
-      .withPartial('dude', '')
-      .toCompileTo('Dudes: ');
-  });
-
-  // Skipping test as this only makes sense when there's no `compile` function (i.e. runtime-only mode).
-  // We do not support that mode with `@kbn/handlebars`, so there's no need to test it
-  it.skip('throw on missing partial', () => {
-    const handlebars = Handlebars.create();
-    (handlebars.compile as any) = undefined;
-    const template = handlebars.precompile('{{> dude}}');
-    const render = handlebars.template(eval('(' + template + ')')); // eslint-disable-line no-eval
-    expect(() => {
-      render(
-        {},
-        {
-          partials: {
-            dude: 'fail',
-          },
-        }
-      );
-    }).toThrow(/The partial dude could not be compiled/);
-  });
-
-  describe('partial blocks', () => {
-    it('should render partial block as default', () => {
-      expectTemplate('{{#> dude}}success{{/dude}}').toCompileTo('success');
-    });
-
-    it('should execute default block with proper context', () => {
-      expectTemplate('{{#> dude context}}{{value}}{{/dude}}')
-        .withInput({ context: { value: 'success' } })
-        .toCompileTo('success');
-    });
-
-    it('should propagate block parameters to default block', () => {
-      expectTemplate('{{#with context as |me|}}{{#> dude}}{{me.value}}{{/dude}}{{/with}}')
-        .withInput({ context: { value: 'success' } })
-        .toCompileTo('success');
-    });
-
-    it('should not use partial block if partial exists', () => {
-      expectTemplate('{{#> dude}}fail{{/dude}}')
-        .withPartials({ dude: 'success' })
-        .toCompileTo('success');
-    });
-
-    it('should render block from partial', () => {
-      expectTemplate('{{#> dude}}success{{/dude}}')
-        .withPartials({ dude: '{{> @partial-block }}' })
-        .toCompileTo('success');
-    });
-
-    it('should be able to render the partial-block twice', () => {
-      expectTemplate('{{#> dude}}success{{/dude}}')
-        .withPartials({ dude: '{{> @partial-block }} {{> @partial-block }}' })
-        .toCompileTo('success success');
-    });
-
-    it('should render block from partial with context', () => {
-      expectTemplate('{{#> dude}}{{value}}{{/dude}}')
-        .withInput({ context: { value: 'success' } })
-        .withPartials({
-          dude: '{{#with context}}{{> @partial-block }}{{/with}}',
-        })
-        .toCompileTo('success');
-    });
-
-    it('should be able to access the @data frame from a partial-block', () => {
-      expectTemplate('{{#> dude}}in-block: {{@root/value}}{{/dude}}')
-        .withInput({ value: 'success' })
-        .withPartials({
-          dude: '<code>before-block: {{@root/value}} {{>   @partial-block }}</code>',
-        })
-        .toCompileTo('<code>before-block: success in-block: success</code>');
-    });
-
-    it('should allow the #each-helper to be used along with partial-blocks', () => {
-      expectTemplate('<template>{{#> list value}}value = {{.}}{{/list}}</template>')
-        .withInput({
-          value: ['a', 'b', 'c'],
-        })
-        .withPartials({
-          list: '<list>{{#each .}}<item>{{> @partial-block}}</item>{{/each}}</list>',
-        })
-        .toCompileTo(
-          '<template><list><item>value = a</item><item>value = b</item><item>value = c</item></list></template>'
-        );
-    });
-
-    it('should render block from partial with context (twice)', () => {
-      expectTemplate('{{#> dude}}{{value}}{{/dude}}')
-        .withInput({ context: { value: 'success' } })
-        .withPartials({
-          dude: '{{#with context}}{{> @partial-block }} {{> @partial-block }}{{/with}}',
-        })
-        .toCompileTo('success success');
-    });
-
-    it('should render block from partial with context [2]', () => {
-      expectTemplate('{{#> dude}}{{../context/value}}{{/dude}}')
-        .withInput({ context: { value: 'success' } })
-        .withPartials({
-          dude: '{{#with context}}{{> @partial-block }}{{/with}}',
-        })
-        .toCompileTo('success');
-    });
-
-    it('should render block from partial with block params', () => {
-      expectTemplate('{{#with context as |me|}}{{#> dude}}{{me.value}}{{/dude}}{{/with}}')
-        .withInput({ context: { value: 'success' } })
-        .withPartials({ dude: '{{> @partial-block }}' })
-        .toCompileTo('success');
-    });
-
-    it('should render nested partial blocks', () => {
-      expectTemplate('<template>{{#> outer}}{{value}}{{/outer}}</template>')
-        .withInput({ value: 'success' })
-        .withPartials({
-          outer:
-            '<outer>{{#> nested}}<outer-block>{{> @partial-block}}</outer-block>{{/nested}}</outer>',
-          nested: '<nested>{{> @partial-block}}</nested>',
-        })
-        .toCompileTo(
-          '<template><outer><nested><outer-block>success</outer-block></nested></outer></template>'
-        );
-    });
-
-    it('should render nested partial blocks at different nesting levels', () => {
-      expectTemplate('<template>{{#> outer}}{{value}}{{/outer}}</template>')
-        .withInput({ value: 'success' })
-        .withPartials({
-          outer:
-            '<outer>{{#> nested}}<outer-block>{{> @partial-block}}</outer-block>{{/nested}}{{> @partial-block}}</outer>',
-          nested: '<nested>{{> @partial-block}}</nested>',
-        })
-        .toCompileTo(
-          '<template><outer><nested><outer-block>success</outer-block></nested>success</outer></template>'
-        );
-    });
-
-    it('should render nested partial blocks at different nesting levels (twice)', () => {
-      expectTemplate('<template>{{#> outer}}{{value}}{{/outer}}</template>')
-        .withInput({ value: 'success' })
-        .withPartials({
-          outer:
-            '<outer>{{#> nested}}<outer-block>{{> @partial-block}} {{> @partial-block}}</outer-block>{{/nested}}{{> @partial-block}}+{{> @partial-block}}</outer>',
-          nested: '<nested>{{> @partial-block}}</nested>',
-        })
-        .toCompileTo(
-          '<template><outer><nested><outer-block>success success</outer-block></nested>success+success</outer></template>'
-        );
-    });
-
-    it('should render nested partial blocks (twice at each level)', () => {
-      expectTemplate('<template>{{#> outer}}{{value}}{{/outer}}</template>')
-        .withInput({ value: 'success' })
-        .withPartials({
-          outer:
-            '<outer>{{#> nested}}<outer-block>{{> @partial-block}} {{> @partial-block}}</outer-block>{{/nested}}</outer>',
-          nested: '<nested>{{> @partial-block}}{{> @partial-block}}</nested>',
-        })
-        .toCompileTo(
-          '<template><outer>' +
-            '<nested><outer-block>success success</outer-block><outer-block>success success</outer-block></nested>' +
-            '</outer></template>'
-        );
-    });
-  });
-
-  describe('inline partials', () => {
-    it('should define inline partials for template', () => {
-      expectTemplate('{{#*inline "myPartial"}}success{{/inline}}{{> myPartial}}').toCompileTo(
-        'success'
-      );
-    });
-
-    it('should overwrite multiple partials in the same template', () => {
-      expectTemplate(
-        '{{#*inline "myPartial"}}fail{{/inline}}{{#*inline "myPartial"}}success{{/inline}}{{> myPartial}}'
-      ).toCompileTo('success');
-    });
-
-    it('should define inline partials for block', () => {
-      expectTemplate(
-        '{{#with .}}{{#*inline "myPartial"}}success{{/inline}}{{> myPartial}}{{/with}}'
-      ).toCompileTo('success');
-
-      expectTemplate(
-        '{{#with .}}{{#*inline "myPartial"}}success{{/inline}}{{/with}}{{> myPartial}}'
-      ).toThrow(/myPartial could not/);
-    });
-
-    it('should override global partials', () => {
-      expectTemplate('{{#*inline "myPartial"}}success{{/inline}}{{> myPartial}}')
-        .withPartials({
-          myPartial: () => 'fail',
-        })
-        .toCompileTo('success');
-    });
-
-    it('should override template partials', () => {
-      expectTemplate(
-        '{{#*inline "myPartial"}}fail{{/inline}}{{#with .}}{{#*inline "myPartial"}}success{{/inline}}{{> myPartial}}{{/with}}'
-      ).toCompileTo('success');
-    });
-
-    it('should override partials down the entire stack', () => {
-      expectTemplate(
-        '{{#with .}}{{#*inline "myPartial"}}success{{/inline}}{{#with .}}{{#with .}}{{> myPartial}}{{/with}}{{/with}}{{/with}}'
-      ).toCompileTo('success');
-    });
-
-    it('should define inline partials for partial call', () => {
-      expectTemplate('{{#*inline "myPartial"}}success{{/inline}}{{> dude}}')
-        .withPartials({ dude: '{{> myPartial }}' })
-        .toCompileTo('success');
-    });
-
-    it('should define inline partials in partial block call', () => {
-      expectTemplate('{{#> dude}}{{#*inline "myPartial"}}success{{/inline}}{{/dude}}')
-        .withPartials({ dude: '{{> myPartial }}' })
-        .toCompileTo('success');
-    });
-
-    it('should render nested inline partials', () => {
-      expectTemplate(
-        '{{#*inline "outer"}}{{#>inner}}<outer-block>{{>@partial-block}}</outer-block>{{/inner}}{{/inline}}' +
-          '{{#*inline "inner"}}<inner>{{>@partial-block}}</inner>{{/inline}}' +
-          '{{#>outer}}{{value}}{{/outer}}'
-      )
-        .withInput({ value: 'success' })
-        .toCompileTo('<inner><outer-block>success</outer-block></inner>');
-    });
-
-    it('should render nested inline partials with partial-blocks on different nesting levels', () => {
-      expectTemplate(
-        '{{#*inline "outer"}}{{#>inner}}<outer-block>{{>@partial-block}}</outer-block>{{/inner}}{{>@partial-block}}{{/inline}}' +
-          '{{#*inline "inner"}}<inner>{{>@partial-block}}</inner>{{/inline}}' +
-          '{{#>outer}}{{value}}{{/outer}}'
-      )
-        .withInput({ value: 'success' })
-        .toCompileTo('<inner><outer-block>success</outer-block></inner>success');
-    });
-
-    it('should render nested inline partials (twice at each level)', () => {
-      expectTemplate(
-        '{{#*inline "outer"}}{{#>inner}}<outer-block>{{>@partial-block}} {{>@partial-block}}</outer-block>{{/inner}}{{/inline}}' +
-          '{{#*inline "inner"}}<inner>{{>@partial-block}}{{>@partial-block}}</inner>{{/inline}}' +
-          '{{#>outer}}{{value}}{{/outer}}'
-      )
-        .withInput({ value: 'success' })
-        .toCompileTo(
-          '<inner><outer-block>success success</outer-block><outer-block>success success</outer-block></inner>'
-        );
-    });
-  });
-
-  forEachCompileFunctionName((compileName) => {
-    it(`should pass compiler flags for ${compileName} function`, () => {
-      const env = Handlebars.create();
-      env.registerPartial('partial', '{{foo}}');
-      const compile = env[compileName].bind(env);
-      const template = compile('{{foo}} {{> partial}}', { noEscape: true });
-      expect(template({ foo: '<' })).toEqual('< <');
-    });
-  });
-
-  describe('standalone partials', () => {
-    it('indented partials', () => {
-      expectTemplate('Dudes:\n{{#dudes}}\n  {{>dude}}\n{{/dudes}}')
-        .withInput({
-          dudes: [
-            { name: 'Yehuda', url: 'http://yehuda' },
-            { name: 'Alan', url: 'http://alan' },
-          ],
-        })
-        .withPartial('dude', '{{name}}\n')
-        .toCompileTo('Dudes:\n  Yehuda\n  Alan\n');
-    });
-
-    it('nested indented partials', () => {
-      expectTemplate('Dudes:\n{{#dudes}}\n  {{>dude}}\n{{/dudes}}')
-        .withInput({
-          dudes: [
-            { name: 'Yehuda', url: 'http://yehuda' },
-            { name: 'Alan', url: 'http://alan' },
-          ],
-        })
-        .withPartials({
-          dude: '{{name}}\n {{> url}}',
-          url: '{{url}}!\n',
-        })
-        .toCompileTo('Dudes:\n  Yehuda\n   http://yehuda!\n  Alan\n   http://alan!\n');
-    });
-
-    it('prevent nested indented partials', () => {
-      expectTemplate('Dudes:\n{{#dudes}}\n  {{>dude}}\n{{/dudes}}')
-        .withInput({
-          dudes: [
-            { name: 'Yehuda', url: 'http://yehuda' },
-            { name: 'Alan', url: 'http://alan' },
-          ],
-        })
-        .withPartials({
-          dude: '{{name}}\n {{> url}}',
-          url: '{{url}}!\n',
-        })
-        .withCompileOptions({ preventIndent: true })
-        .toCompileTo('Dudes:\n  Yehuda\n http://yehuda!\n  Alan\n http://alan!\n');
-    });
-  });
-});
diff --git a/dev/lib/handlebars/src/spec/index.regressions.test.ts b/dev/lib/handlebars/src/spec/index.regressions.test.ts
deleted file mode 100644
index fc2065fe..00000000
--- a/dev/lib/handlebars/src/spec/index.regressions.test.ts
+++ /dev/null
@@ -1,379 +0,0 @@
-/*
- * This file is forked from the handlebars project (https://github.com/handlebars-lang/handlebars.js),
- * and may include modifications made by Elasticsearch B.V.
- * Elasticsearch B.V. licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import Handlebars, { type HelperOptions } from '../..';
-import { expectTemplate, forEachCompileFunctionName } from '../__jest__/test_bench';
-
-describe('Regressions', () => {
-  it('GH-94: Cannot read property of undefined', () => {
-    expectTemplate('{{#books}}{{title}}{{author.name}}{{/books}}')
-      .withInput({
-        books: [
-          {
-            title: 'The origin of species',
-            author: {
-              name: 'Charles Darwin',
-            },
-          },
-          {
-            title: 'Lazarillo de Tormes',
-          },
-        ],
-      })
-      .toCompileTo('The origin of speciesCharles DarwinLazarillo de Tormes');
-  });
-
-  it("GH-150: Inverted sections print when they shouldn't", () => {
-    const string = '{{^set}}not set{{/set}} :: {{#set}}set{{/set}}';
-    expectTemplate(string).toCompileTo('not set :: ');
-    expectTemplate(string).withInput({ set: undefined }).toCompileTo('not set :: ');
-    expectTemplate(string).withInput({ set: false }).toCompileTo('not set :: ');
-    expectTemplate(string).withInput({ set: true }).toCompileTo(' :: set');
-  });
-
-  it('GH-158: Using array index twice, breaks the template', () => {
-    expectTemplate('{{arr.[0]}}, {{arr.[1]}}')
-      .withInput({ arr: [1, 2] })
-      .toCompileTo('1, 2');
-  });
-
-  it("bug reported by @fat where lambdas weren't being properly resolved", () => {
-    const string =
-      '<strong>This is a slightly more complicated {{thing}}.</strong>.\n' +
-      '{{! Just ignore this business. }}\n' +
-      'Check this out:\n' +
-      '{{#hasThings}}\n' +
-      '<ul>\n' +
-      '{{#things}}\n' +
-      '<li class={{className}}>{{word}}</li>\n' +
-      '{{/things}}</ul>.\n' +
-      '{{/hasThings}}\n' +
-      '{{^hasThings}}\n' +
-      '\n' +
-      '<small>Nothing to check out...</small>\n' +
-      '{{/hasThings}}';
-
-    const data = {
-      thing() {
-        return 'blah';
-      },
-      things: [
-        { className: 'one', word: '@fat' },
-        { className: 'two', word: '@dhg' },
-        { className: 'three', word: '@sayrer' },
-      ],
-      hasThings() {
-        return true;
-      },
-    };
-
-    const output =
-      '<strong>This is a slightly more complicated blah.</strong>.\n' +
-      'Check this out:\n' +
-      '<ul>\n' +
-      '<li class=one>@fat</li>\n' +
-      '<li class=two>@dhg</li>\n' +
-      '<li class=three>@sayrer</li>\n' +
-      '</ul>.\n';
-
-    expectTemplate(string).withInput(data).toCompileTo(output);
-  });
-
-  it('GH-408: Multiple loops fail', () => {
-    expectTemplate('{{#.}}{{name}}{{/.}}{{#.}}{{name}}{{/.}}{{#.}}{{name}}{{/.}}')
-      .withInput([
-        { name: 'John Doe', location: { city: 'Chicago' } },
-        { name: 'Jane Doe', location: { city: 'New York' } },
-      ])
-      .toCompileTo('John DoeJane DoeJohn DoeJane DoeJohn DoeJane Doe');
-  });
-
-  it('GS-428: Nested if else rendering', () => {
-    const succeedingTemplate =
-      '{{#inverse}} {{#blk}} Unexpected {{/blk}} {{else}}  {{#blk}} Expected {{/blk}} {{/inverse}}';
-    const failingTemplate =
-      '{{#inverse}} {{#blk}} Unexpected {{/blk}} {{else}} {{#blk}} Expected {{/blk}} {{/inverse}}';
-
-    const helpers = {
-      blk(block: HelperOptions) {
-        return block.fn('');
-      },
-      inverse(block: HelperOptions) {
-        return block.inverse('');
-      },
-    };
-
-    expectTemplate(succeedingTemplate).withHelpers(helpers).toCompileTo('   Expected  ');
-    expectTemplate(failingTemplate).withHelpers(helpers).toCompileTo('  Expected  ');
-  });
-
-  it('GH-458: Scoped this identifier', () => {
-    expectTemplate('{{./foo}}').withInput({ foo: 'bar' }).toCompileTo('bar');
-  });
-
-  it('GH-375: Unicode line terminators', () => {
-    expectTemplate('\u2028').toCompileTo('\u2028');
-  });
-
-  it('GH-534: Object prototype aliases', () => {
-    /* eslint-disable no-extend-native */
-    // @ts-expect-error
-    Object.prototype[0xd834] = true;
-
-    expectTemplate('{{foo}}').withInput({ foo: 'bar' }).toCompileTo('bar');
-
-    // @ts-expect-error
-    delete Object.prototype[0xd834];
-    /* eslint-enable no-extend-native */
-  });
-
-  it('GH-437: Matching escaping', () => {
-    expectTemplate('{{{a}}').toThrow(/Parse error on/);
-    expectTemplate('{{a}}}').toThrow(/Parse error on/);
-  });
-
-  it('GH-676: Using array in escaping mustache fails', () => {
-    const data = { arr: [1, 2] };
-    expectTemplate('{{arr}}').withInput(data).toCompileTo(data.arr.toString());
-  });
-
-  it('Mustache man page', () => {
-    expectTemplate(
-      'Hello {{name}}. You have just won ${{value}}!{{#in_ca}} Well, ${{taxed_value}}, after taxes.{{/in_ca}}'
-    )
-      .withInput({
-        name: 'Chris',
-        value: 10000,
-        taxed_value: 10000 - 10000 * 0.4,
-        in_ca: true,
-      })
-      .toCompileTo('Hello Chris. You have just won $10000! Well, $6000, after taxes.');
-  });
-
-  it('GH-731: zero context rendering', () => {
-    expectTemplate('{{#foo}} This is {{bar}} ~ {{/foo}}')
-      .withInput({
-        foo: 0,
-        bar: 'OK',
-      })
-      .toCompileTo(' This is  ~ ');
-  });
-
-  it('GH-820: zero pathed rendering', () => {
-    expectTemplate('{{foo.bar}}').withInput({ foo: 0 }).toCompileTo('');
-  });
-
-  it('GH-837: undefined values for helpers', () => {
-    expectTemplate('{{str bar.baz}}')
-      .withHelpers({
-        str(value) {
-          return value + '';
-        },
-      })
-      .toCompileTo('undefined');
-  });
-
-  it('GH-926: Depths and de-dupe', () => {
-    expectTemplate(
-      '{{#if dater}}{{#each data}}{{../name}}{{/each}}{{else}}{{#each notData}}{{../name}}{{/each}}{{/if}}'
-    )
-      .withInput({
-        name: 'foo',
-        data: [1],
-        notData: [1],
-      })
-      .toCompileTo('foo');
-  });
-
-  it('GH-1021: Each empty string key', () => {
-    expectTemplate('{{#each data}}Key: {{@key}}\n{{/each}}')
-      .withInput({
-        data: {
-          '': 'foo',
-          name: 'Chris',
-          value: 10000,
-        },
-      })
-      .toCompileTo('Key: \nKey: name\nKey: value\n');
-  });
-
-  it('GH-1054: Should handle simple safe string responses', () => {
-    expectTemplate('{{#wrap}}{{>partial}}{{/wrap}}')
-      .withHelpers({
-        wrap(options: HelperOptions) {
-          return new Handlebars.SafeString(options.fn());
-        },
-      })
-      .withPartials({
-        partial: '{{#wrap}}<partial>{{/wrap}}',
-      })
-      .toCompileTo('<partial>');
-  });
-
-  it('GH-1065: Sparse arrays', () => {
-    const array = [];
-    array[1] = 'foo';
-    array[3] = 'bar';
-    expectTemplate('{{#each array}}{{@index}}{{.}}{{/each}}')
-      .withInput({ array })
-      .toCompileTo('1foo3bar');
-  });
-
-  it('GH-1093: Undefined helper context', () => {
-    expectTemplate('{{#each obj}}{{{helper}}}{{.}}{{/each}}')
-      .withInput({ obj: { foo: undefined, bar: 'bat' } })
-      .withHelpers({
-        helper(this: any) {
-          // It's valid to execute a block against an undefined context, but
-          // helpers can not do so, so we expect to have an empty object here;
-          for (const name in this) {
-            if (Object.prototype.hasOwnProperty.call(this, name)) {
-              return 'found';
-            }
-          }
-          // And to make IE happy, check for the known string as length is not enumerated.
-          return this === 'bat' ? 'found' : 'not';
-        },
-      })
-      .toCompileTo('notfoundbat');
-  });
-
-  it('should support multiple levels of inline partials', () => {
-    expectTemplate('{{#> layout}}{{#*inline "subcontent"}}subcontent{{/inline}}{{/layout}}')
-      .withPartials({
-        doctype: 'doctype{{> content}}',
-        layout: '{{#> doctype}}{{#*inline "content"}}layout{{> subcontent}}{{/inline}}{{/doctype}}',
-      })
-      .toCompileTo('doctypelayoutsubcontent');
-  });
-
-  it('GH-1089: should support failover content in multiple levels of inline partials', () => {
-    expectTemplate('{{#> layout}}{{/layout}}')
-      .withPartials({
-        doctype: 'doctype{{> content}}',
-        layout:
-          '{{#> doctype}}{{#*inline "content"}}layout{{#> subcontent}}subcontent{{/subcontent}}{{/inline}}{{/doctype}}',
-      })
-      .toCompileTo('doctypelayoutsubcontent');
-  });
-
-  it('GH-1099: should support greater than 3 nested levels of inline partials', () => {
-    expectTemplate('{{#> layout}}Outer{{/layout}}')
-      .withPartials({
-        layout: '{{#> inner}}Inner{{/inner}}{{> @partial-block }}',
-        inner: '',
-      })
-      .toCompileTo('Outer');
-  });
-
-  it('GH-1135 : Context handling within each iteration', () => {
-    expectTemplate(
-      '{{#each array}}\n' +
-        ' 1. IF: {{#if true}}{{../name}}-{{../../name}}-{{../../../name}}{{/if}}\n' +
-        ' 2. MYIF: {{#myif true}}{{../name}}={{../../name}}={{../../../name}}{{/myif}}\n' +
-        '{{/each}}'
-    )
-      .withInput({ array: [1], name: 'John' })
-      .withHelpers({
-        myif(conditional, options: HelperOptions) {
-          if (conditional) {
-            return options.fn(this);
-          } else {
-            return options.inverse(this);
-          }
-        },
-      })
-      .toCompileTo(' 1. IF: John--\n' + ' 2. MYIF: John==\n');
-  });
-
-  it('GH-1186: Support block params for existing programs', () => {
-    expectTemplate(
-      '{{#*inline "test"}}{{> @partial-block }}{{/inline}}' +
-        '{{#>test }}{{#each listOne as |item|}}{{ item }}{{/each}}{{/test}}' +
-        '{{#>test }}{{#each listTwo as |item|}}{{ item }}{{/each}}{{/test}}'
-    )
-      .withInput({
-        listOne: ['a'],
-        listTwo: ['b'],
-      })
-      .toCompileTo('ab');
-  });
-
-  it('GH-1319: "unless" breaks when "each" value equals "null"', () => {
-    expectTemplate('{{#each list}}{{#unless ./prop}}parent={{../value}} {{/unless}}{{/each}}')
-      .withInput({
-        value: 'parent',
-        list: [null, 'a'],
-      })
-      .toCompileTo('parent=parent parent=parent ');
-  });
-
-  it('GH-1341: 4.0.7 release breaks {{#if @partial-block}} usage', () => {
-    expectTemplate('template {{>partial}} template')
-      .withPartials({
-        partialWithBlock: '{{#if @partial-block}} block {{> @partial-block}} block {{/if}}',
-        partial: '{{#> partialWithBlock}} partial {{/partialWithBlock}}',
-      })
-      .toCompileTo('template  block  partial  block  template');
-  });
-
-  it('should allow hash with protected array names', () => {
-    expectTemplate('{{helpa length="foo"}}')
-      .withInput({ array: [1], name: 'John' })
-      .withHelpers({
-        helpa(options: HelperOptions) {
-          return options.hash.length;
-        },
-      })
-      .toCompileTo('foo');
-  });
-
-  describe('GH-1598: Performance degradation for partials since v4.3.0', () => {
-    let newHandlebarsInstance: typeof Handlebars;
-    let spy: jest.SpyInstance;
-    beforeEach(() => {
-      newHandlebarsInstance = Handlebars.create();
-    });
-    afterEach(() => {
-      spy.mockRestore();
-    });
-
-    forEachCompileFunctionName((compileName) => {
-      it(`should only compile global partials once when calling #${compileName}`, () => {
-        const compile = newHandlebarsInstance[compileName].bind(newHandlebarsInstance);
-        let calls;
-        switch (compileName) {
-          case 'compile':
-            spy = jest.spyOn(newHandlebarsInstance, 'template');
-            calls = 3;
-            break;
-          case 'compileAST':
-            spy = jest.spyOn(newHandlebarsInstance, 'compileAST');
-            calls = 2;
-            break;
-        }
-        newHandlebarsInstance.registerPartial({
-          dude: 'I am a partial',
-        });
-        const string = 'Dudes: {{> dude}} {{> dude}}';
-        compile(string)(); // This should compile template + partial once
-        compile(string)(); // This should only compile template
-        expect(spy).toHaveBeenCalledTimes(calls);
-        spy.mockRestore();
-      });
-    });
-  });
-
-  describe("GH-1639: TypeError: Cannot read property 'apply' of undefined\" when handlebars version > 4.6.0 (undocumented, deprecated usage)", () => {
-    it('should treat undefined helpers like non-existing helpers', () => {
-      expectTemplate('{{foo}}')
-        .withHelper('foo', undefined as any)
-        .withInput({ foo: 'bar' })
-        .toCompileTo('bar');
-    });
-  });
-});
diff --git a/dev/lib/handlebars/src/spec/index.security.test.ts b/dev/lib/handlebars/src/spec/index.security.test.ts
deleted file mode 100644
index 878a0931..00000000
--- a/dev/lib/handlebars/src/spec/index.security.test.ts
+++ /dev/null
@@ -1,132 +0,0 @@
-/*
- * This file is forked from the handlebars project (https://github.com/handlebars-lang/handlebars.js),
- * and may include modifications made by Elasticsearch B.V.
- * Elasticsearch B.V. licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import Handlebars from '../..';
-import { expectTemplate } from '../__jest__/test_bench';
-
-describe('security issues', () => {
-  describe('GH-1495: Prevent Remote Code Execution via constructor', () => {
-    it('should not allow constructors to be accessed', () => {
-      expectTemplate('{{lookup (lookup this "constructor") "name"}}').withInput({}).toCompileTo('');
-      expectTemplate('{{constructor.name}}').withInput({}).toCompileTo('');
-    });
-
-    it('GH-1603: should not allow constructors to be accessed (lookup via toString)', () => {
-      expectTemplate('{{lookup (lookup this (list "constructor")) "name"}}')
-        .withInput({})
-        .withHelper('list', function (element) {
-          return [element];
-        })
-        .toCompileTo('');
-    });
-
-    it('should allow the "constructor" property to be accessed if it is an "ownProperty"', () => {
-      expectTemplate('{{constructor.name}}')
-        .withInput({ constructor: { name: 'here we go' } })
-        .toCompileTo('here we go');
-
-      expectTemplate('{{lookup (lookup this "constructor") "name"}}')
-        .withInput({ constructor: { name: 'here we go' } })
-        .toCompileTo('here we go');
-    });
-
-    it('should allow the "constructor" property to be accessed if it is an "own property"', () => {
-      expectTemplate('{{lookup (lookup this "constructor") "name"}}')
-        .withInput({ constructor: { name: 'here we go' } })
-        .toCompileTo('here we go');
-    });
-  });
-
-  describe('GH-1558: Prevent explicit call of helperMissing-helpers', () => {
-    describe('without the option "allowExplicitCallOfHelperMissing"', () => {
-      it('should throw an exception when calling  "{{helperMissing}}" ', () => {
-        expectTemplate('{{helperMissing}}').toThrow(Error);
-      });
-
-      it('should throw an exception when calling  "{{#helperMissing}}{{/helperMissing}}" ', () => {
-        expectTemplate('{{#helperMissing}}{{/helperMissing}}').toThrow(Error);
-      });
-
-      it('should throw an exception when calling  "{{blockHelperMissing "abc" .}}" ', () => {
-        const functionCalls = [];
-        expect(() => {
-          const template = Handlebars.compile('{{blockHelperMissing "abc" .}}');
-          template({
-            fn() {
-              functionCalls.push('called');
-            },
-          });
-        }).toThrow(Error);
-        expect(functionCalls.length).toEqual(0);
-      });
-
-      it('should throw an exception when calling  "{{#blockHelperMissing .}}{{/blockHelperMissing}}"', () => {
-        expectTemplate('{{#blockHelperMissing .}}{{/blockHelperMissing}}')
-          .withInput({
-            fn() {
-              return 'functionInData';
-            },
-          })
-          .toThrow(Error);
-      });
-    });
-  });
-
-  describe('GH-1563', () => {
-    it('should not allow to access constructor after overriding via __defineGetter__', () => {
-      // @ts-expect-error
-      if ({}.__defineGetter__ == null || {}.__lookupGetter__ == null) {
-        return; // Browser does not support this exploit anyway
-      }
-      expectTemplate(
-        '{{__defineGetter__ "undefined" valueOf }}' +
-          '{{#with __lookupGetter__ }}' +
-          '{{__defineGetter__ "propertyIsEnumerable" (this.bind (this.bind 1)) }}' +
-          '{{constructor.name}}' +
-          '{{/with}}'
-      )
-        .withInput({})
-        .toThrow(/Missing helper: "__defineGetter__"/);
-    });
-  });
-
-  describe('GH-1595: dangerous properties', () => {
-    const templates = [
-      '{{constructor}}',
-      '{{__defineGetter__}}',
-      '{{__defineSetter__}}',
-      '{{__lookupGetter__}}',
-      '{{__proto__}}',
-      '{{lookup this "constructor"}}',
-      '{{lookup this "__defineGetter__"}}',
-      '{{lookup this "__defineSetter__"}}',
-      '{{lookup this "__lookupGetter__"}}',
-      '{{lookup this "__proto__"}}',
-    ];
-
-    templates.forEach((template) => {
-      describe('access should be denied to ' + template, () => {
-        it('by default', () => {
-          expectTemplate(template).withInput({}).toCompileTo('');
-        });
-      });
-    });
-  });
-
-  describe('escapes template variables', () => {
-    it('in default mode', () => {
-      expectTemplate("{{'a\\b'}}").withCompileOptions().withInput({ 'a\\b': 'c' }).toCompileTo('c');
-    });
-
-    it('in strict mode', () => {
-      expectTemplate("{{'a\\b'}}")
-        .withCompileOptions({ strict: true })
-        .withInput({ 'a\\b': 'c' })
-        .toCompileTo('c');
-    });
-  });
-});
diff --git a/dev/lib/handlebars/src/spec/index.strict.test.ts b/dev/lib/handlebars/src/spec/index.strict.test.ts
deleted file mode 100644
index a8f294b9..00000000
--- a/dev/lib/handlebars/src/spec/index.strict.test.ts
+++ /dev/null
@@ -1,164 +0,0 @@
-/*
- * This file is forked from the handlebars project (https://github.com/handlebars-lang/handlebars.js),
- * and may include modifications made by Elasticsearch B.V.
- * Elasticsearch B.V. licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import { expectTemplate } from '../__jest__/test_bench';
-
-describe('strict', () => {
-  describe('strict mode', () => {
-    it('should error on missing property lookup', () => {
-      expectTemplate('{{hello}}')
-        .withCompileOptions({ strict: true })
-        .toThrow(/"hello" not defined in/);
-    });
-
-    it('should error on missing child', () => {
-      expectTemplate('{{hello.bar}}')
-        .withCompileOptions({ strict: true })
-        .withInput({ hello: { bar: 'foo' } })
-        .toCompileTo('foo');
-
-      expectTemplate('{{hello.bar}}')
-        .withCompileOptions({ strict: true })
-        .withInput({ hello: {} })
-        .toThrow(/"bar" not defined in/);
-    });
-
-    it('should handle explicit undefined', () => {
-      expectTemplate('{{hello.bar}}')
-        .withCompileOptions({ strict: true })
-        .withInput({ hello: { bar: undefined } })
-        .toCompileTo('');
-    });
-
-    it('should error on missing property lookup in known helpers mode', () => {
-      expectTemplate('{{hello}}')
-        .withCompileOptions({
-          strict: true,
-          knownHelpersOnly: true,
-        })
-        .toThrow(/"hello" not defined in/);
-    });
-
-    it('should error on missing context', () => {
-      expectTemplate('{{hello}}').withCompileOptions({ strict: true }).toThrow(Error);
-    });
-
-    it('should error on missing data lookup', () => {
-      const xt = expectTemplate('{{@hello}}').withCompileOptions({
-        strict: true,
-      });
-
-      xt.toThrow(Error);
-
-      xt.withRuntimeOptions({ data: { hello: 'foo' } }).toCompileTo('foo');
-    });
-
-    it('should not run helperMissing for helper calls', () => {
-      expectTemplate('{{hello foo}}')
-        .withCompileOptions({ strict: true })
-        .withInput({ foo: true })
-        .toThrow(/"hello" not defined in/);
-
-      expectTemplate('{{#hello foo}}{{/hello}}')
-        .withCompileOptions({ strict: true })
-        .withInput({ foo: true })
-        .toThrow(/"hello" not defined in/);
-    });
-
-    it('should throw on ambiguous blocks', () => {
-      expectTemplate('{{#hello}}{{/hello}}')
-        .withCompileOptions({ strict: true })
-        .toThrow(/"hello" not defined in/);
-
-      expectTemplate('{{^hello}}{{/hello}}')
-        .withCompileOptions({ strict: true })
-        .toThrow(/"hello" not defined in/);
-
-      expectTemplate('{{#hello.bar}}{{/hello.bar}}')
-        .withCompileOptions({ strict: true })
-        .withInput({ hello: {} })
-        .toThrow(/"bar" not defined in/);
-    });
-
-    it('should allow undefined parameters when passed to helpers', () => {
-      expectTemplate('{{#unless foo}}success{{/unless}}')
-        .withCompileOptions({ strict: true })
-        .toCompileTo('success');
-    });
-
-    it('should allow undefined hash when passed to helpers', () => {
-      expectTemplate('{{helper value=@foo}}')
-        .withCompileOptions({
-          strict: true,
-        })
-        .withHelpers({
-          helper(options) {
-            expect('value' in options.hash).toEqual(true);
-            expect(options.hash.value).toBeUndefined();
-            return 'success';
-          },
-        })
-        .toCompileTo('success');
-    });
-
-    it('should show error location on missing property lookup', () => {
-      expectTemplate('\n\n\n   {{hello}}')
-        .withCompileOptions({ strict: true })
-        .toThrow('"hello" not defined in [object Object] - 4:5');
-    });
-
-    it('should error contains correct location properties on missing property lookup', () => {
-      try {
-        expectTemplate('\n\n\n   {{hello}}')
-          .withCompileOptions({ strict: true })
-          .toCompileTo('throw before asserting this');
-      } catch (error) {
-        expect(error.lineNumber).toEqual(4);
-        expect(error.endLineNumber).toEqual(4);
-        expect(error.column).toEqual(5);
-        expect(error.endColumn).toEqual(10);
-      }
-    });
-  });
-
-  describe('assume objects', () => {
-    it('should ignore missing property', () => {
-      expectTemplate('{{hello}}').withCompileOptions({ assumeObjects: true }).toCompileTo('');
-    });
-
-    it('should ignore missing child', () => {
-      expectTemplate('{{hello.bar}}')
-        .withCompileOptions({ assumeObjects: true })
-        .withInput({ hello: {} })
-        .toCompileTo('');
-    });
-
-    it('should error on missing object', () => {
-      expectTemplate('{{hello.bar}}').withCompileOptions({ assumeObjects: true }).toThrow(Error);
-    });
-
-    it('should error on missing context', () => {
-      expectTemplate('{{hello}}')
-        .withCompileOptions({ assumeObjects: true })
-        .withInput(undefined)
-        .toThrow(Error);
-    });
-
-    it('should error on missing data lookup', () => {
-      expectTemplate('{{@hello.bar}}')
-        .withCompileOptions({ assumeObjects: true })
-        .withInput(undefined)
-        .toThrow(Error);
-    });
-
-    it('should execute blockHelperMissing', () => {
-      expectTemplate('{{^hello}}foo{{/hello}}')
-        .withCompileOptions({ assumeObjects: true })
-        .toCompileTo('foo');
-    });
-  });
-});
diff --git a/dev/lib/handlebars/src/spec/index.subexpressions.test.ts b/dev/lib/handlebars/src/spec/index.subexpressions.test.ts
deleted file mode 100644
index 4dee24b7..00000000
--- a/dev/lib/handlebars/src/spec/index.subexpressions.test.ts
+++ /dev/null
@@ -1,214 +0,0 @@
-/*
- * This file is forked from the handlebars project (https://github.com/handlebars-lang/handlebars.js),
- * and may include modifications made by Elasticsearch B.V.
- * Elasticsearch B.V. licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import Handlebars, { type HelperOptions } from '../..';
-import { expectTemplate } from '../__jest__/test_bench';
-
-describe('subexpressions', () => {
-  it('arg-less helper', () => {
-    expectTemplate('{{foo (bar)}}!')
-      .withHelpers({
-        foo(val) {
-          return val + val;
-        },
-        bar() {
-          return 'LOL';
-        },
-      })
-      .toCompileTo('LOLLOL!');
-  });
-
-  it('helper w args', () => {
-    expectTemplate('{{blog (equal a b)}}')
-      .withInput({ bar: 'LOL' })
-      .withHelpers({
-        blog(val) {
-          return 'val is ' + val;
-        },
-        equal(x, y) {
-          return x === y;
-        },
-      })
-      .toCompileTo('val is true');
-  });
-
-  it('mixed paths and helpers', () => {
-    expectTemplate('{{blog baz.bat (equal a b) baz.bar}}')
-      .withInput({ bar: 'LOL', baz: { bat: 'foo!', bar: 'bar!' } })
-      .withHelpers({
-        blog(val, that, theOther) {
-          return 'val is ' + val + ', ' + that + ' and ' + theOther;
-        },
-        equal(x, y) {
-          return x === y;
-        },
-      })
-      .toCompileTo('val is foo!, true and bar!');
-  });
-
-  it('supports much nesting', () => {
-    expectTemplate('{{blog (equal (equal true true) true)}}')
-      .withInput({ bar: 'LOL' })
-      .withHelpers({
-        blog(val) {
-          return 'val is ' + val;
-        },
-        equal(x, y) {
-          return x === y;
-        },
-      })
-      .toCompileTo('val is true');
-  });
-
-  it('GH-800 : Complex subexpressions', () => {
-    const context = { a: 'a', b: 'b', c: { c: 'c' }, d: 'd', e: { e: 'e' } };
-    const helpers = {
-      dash(a: any, b: any) {
-        return a + '-' + b;
-      },
-      concat(a: any, b: any) {
-        return a + b;
-      },
-    };
-
-    expectTemplate("{{dash 'abc' (concat a b)}}")
-      .withInput(context)
-      .withHelpers(helpers)
-      .toCompileTo('abc-ab');
-
-    expectTemplate('{{dash d (concat a b)}}')
-      .withInput(context)
-      .withHelpers(helpers)
-      .toCompileTo('d-ab');
-
-    expectTemplate('{{dash c.c (concat a b)}}')
-      .withInput(context)
-      .withHelpers(helpers)
-      .toCompileTo('c-ab');
-
-    expectTemplate('{{dash (concat a b) c.c}}')
-      .withInput(context)
-      .withHelpers(helpers)
-      .toCompileTo('ab-c');
-
-    expectTemplate('{{dash (concat a e.e) c.c}}')
-      .withInput(context)
-      .withHelpers(helpers)
-      .toCompileTo('ae-c');
-  });
-
-  it('provides each nested helper invocation its own options hash', () => {
-    let lastOptions: HelperOptions;
-    const helpers = {
-      equal(x: any, y: any, options: HelperOptions) {
-        if (!options || options === lastOptions) {
-          throw new Error('options hash was reused');
-        }
-        lastOptions = options;
-        return x === y;
-      },
-    };
-    expectTemplate('{{equal (equal true true) true}}').withHelpers(helpers).toCompileTo('true');
-  });
-
-  it('with hashes', () => {
-    expectTemplate("{{blog (equal (equal true true) true fun='yes')}}")
-      .withInput({ bar: 'LOL' })
-      .withHelpers({
-        blog(val) {
-          return 'val is ' + val;
-        },
-        equal(x, y) {
-          return x === y;
-        },
-      })
-      .toCompileTo('val is true');
-  });
-
-  it('as hashes', () => {
-    expectTemplate("{{blog fun=(equal (blog fun=1) 'val is 1')}}")
-      .withHelpers({
-        blog(options) {
-          return 'val is ' + options.hash.fun;
-        },
-        equal(x, y) {
-          return x === y;
-        },
-      })
-      .toCompileTo('val is true');
-  });
-
-  it('multiple subexpressions in a hash', () => {
-    expectTemplate('{{input aria-label=(t "Name") placeholder=(t "Example User")}}')
-      .withHelpers({
-        input(options) {
-          const hash = options.hash;
-          const ariaLabel = Handlebars.Utils.escapeExpression(hash['aria-label']);
-          const placeholder = Handlebars.Utils.escapeExpression(hash.placeholder);
-          return new Handlebars.SafeString(
-            '<input aria-label="' + ariaLabel + '" placeholder="' + placeholder + '" />'
-          );
-        },
-        t(defaultString) {
-          return new Handlebars.SafeString(defaultString);
-        },
-      })
-      .toCompileTo('<input aria-label="Name" placeholder="Example User" />');
-  });
-
-  it('multiple subexpressions in a hash with context', () => {
-    expectTemplate('{{input aria-label=(t item.field) placeholder=(t item.placeholder)}}')
-      .withInput({
-        item: {
-          field: 'Name',
-          placeholder: 'Example User',
-        },
-      })
-      .withHelpers({
-        input(options) {
-          const hash = options.hash;
-          const ariaLabel = Handlebars.Utils.escapeExpression(hash['aria-label']);
-          const placeholder = Handlebars.Utils.escapeExpression(hash.placeholder);
-          return new Handlebars.SafeString(
-            '<input aria-label="' + ariaLabel + '" placeholder="' + placeholder + '" />'
-          );
-        },
-        t(defaultString) {
-          return new Handlebars.SafeString(defaultString);
-        },
-      })
-      .toCompileTo('<input aria-label="Name" placeholder="Example User" />');
-  });
-
-  it('subexpression functions on the context', () => {
-    expectTemplate('{{foo (bar)}}!')
-      .withInput({
-        bar() {
-          return 'LOL';
-        },
-      })
-      .withHelpers({
-        foo(val) {
-          return val + val;
-        },
-      })
-      .toCompileTo('LOLLOL!');
-  });
-
-  it("subexpressions can't just be property lookups", () => {
-    expectTemplate('{{foo (bar)}}!')
-      .withInput({
-        bar: 'LOL',
-      })
-      .withHelpers({
-        foo(val) {
-          return val + val;
-        },
-      })
-      .toThrow();
-  });
-});
diff --git a/dev/lib/handlebars/src/spec/index.utils.test.ts b/dev/lib/handlebars/src/spec/index.utils.test.ts
deleted file mode 100644
index 6350bc7c..00000000
--- a/dev/lib/handlebars/src/spec/index.utils.test.ts
+++ /dev/null
@@ -1,24 +0,0 @@
-/*
- * This file is forked from the handlebars project (https://github.com/handlebars-lang/handlebars.js),
- * and may include modifications made by Elasticsearch B.V.
- * Elasticsearch B.V. licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import Handlebars from '../..';
-import { expectTemplate } from '../__jest__/test_bench';
-
-describe('utils', function () {
-  describe('#SafeString', function () {
-    it('constructing a safestring from a string and checking its type', function () {
-      const safe = new Handlebars.SafeString('testing 1, 2, 3');
-      expect(safe).toBeInstanceOf(Handlebars.SafeString);
-      expect(safe.toString()).toEqual('testing 1, 2, 3');
-    });
-
-    it('it should not escape SafeString properties', function () {
-      const name = new Handlebars.SafeString('<em>Sean O&#x27;Malley</em>');
-      expectTemplate('{{name}}').withInput({ name }).toCompileTo('<em>Sean O&#x27;Malley</em>');
-    });
-  });
-});
diff --git a/dev/lib/handlebars/src/spec/index.whitespace_control.test.ts b/dev/lib/handlebars/src/spec/index.whitespace_control.test.ts
deleted file mode 100644
index 1f7cf019..00000000
--- a/dev/lib/handlebars/src/spec/index.whitespace_control.test.ts
+++ /dev/null
@@ -1,88 +0,0 @@
-/*
- * This file is forked from the handlebars project (https://github.com/handlebars-lang/handlebars.js),
- * and may include modifications made by Elasticsearch B.V.
- * Elasticsearch B.V. licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import { expectTemplate } from '../__jest__/test_bench';
-
-describe('whitespace control', () => {
-  it('should strip whitespace around mustache calls', () => {
-    const hash = { foo: 'bar<' };
-    expectTemplate(' {{~foo~}} ').withInput(hash).toCompileTo('bar&lt;');
-    expectTemplate(' {{~foo}} ').withInput(hash).toCompileTo('bar&lt; ');
-    expectTemplate(' {{foo~}} ').withInput(hash).toCompileTo(' bar&lt;');
-    expectTemplate(' {{~&foo~}} ').withInput(hash).toCompileTo('bar<');
-    expectTemplate(' {{~{foo}~}} ').withInput(hash).toCompileTo('bar<');
-    expectTemplate('1\n{{foo~}} \n\n 23\n{{bar}}4').toCompileTo('1\n23\n4');
-  });
-
-  describe('blocks', () => {
-    it('should strip whitespace around simple block calls', () => {
-      const hash = { foo: 'bar<' };
-
-      expectTemplate(' {{~#if foo~}} bar {{~/if~}} ').withInput(hash).toCompileTo('bar');
-      expectTemplate(' {{#if foo~}} bar {{/if~}} ').withInput(hash).toCompileTo(' bar ');
-      expectTemplate(' {{~#if foo}} bar {{~/if}} ').withInput(hash).toCompileTo(' bar ');
-      expectTemplate(' {{#if foo}} bar {{/if}} ').withInput(hash).toCompileTo('  bar  ');
-
-      expectTemplate(' \n\n{{~#if foo~}} \n\nbar \n\n{{~/if~}}\n\n ')
-        .withInput(hash)
-        .toCompileTo('bar');
-
-      expectTemplate(' a\n\n{{~#if foo~}} \n\nbar \n\n{{~/if~}}\n\na ')
-        .withInput(hash)
-        .toCompileTo(' abara ');
-    });
-
-    it('should strip whitespace around inverse block calls', () => {
-      expectTemplate(' {{~^if foo~}} bar {{~/if~}} ').toCompileTo('bar');
-      expectTemplate(' {{^if foo~}} bar {{/if~}} ').toCompileTo(' bar ');
-      expectTemplate(' {{~^if foo}} bar {{~/if}} ').toCompileTo(' bar ');
-      expectTemplate(' {{^if foo}} bar {{/if}} ').toCompileTo('  bar  ');
-      expectTemplate(' \n\n{{~^if foo~}} \n\nbar \n\n{{~/if~}}\n\n ').toCompileTo('bar');
-    });
-
-    it('should strip whitespace around complex block calls', () => {
-      const hash = { foo: 'bar<' };
-
-      expectTemplate('{{#if foo~}} bar {{~^~}} baz {{~/if}}').withInput(hash).toCompileTo('bar');
-      expectTemplate('{{#if foo~}} bar {{^~}} baz {{/if}}').withInput(hash).toCompileTo('bar ');
-      expectTemplate('{{#if foo}} bar {{~^~}} baz {{~/if}}').withInput(hash).toCompileTo(' bar');
-      expectTemplate('{{#if foo}} bar {{^~}} baz {{/if}}').withInput(hash).toCompileTo(' bar ');
-      expectTemplate('{{#if foo~}} bar {{~else~}} baz {{~/if}}').withInput(hash).toCompileTo('bar');
-
-      expectTemplate('\n\n{{~#if foo~}} \n\nbar \n\n{{~^~}} \n\nbaz \n\n{{~/if~}}\n\n')
-        .withInput(hash)
-        .toCompileTo('bar');
-
-      expectTemplate('\n\n{{~#if foo~}} \n\n{{{foo}}} \n\n{{~^~}} \n\nbaz \n\n{{~/if~}}\n\n')
-        .withInput(hash)
-        .toCompileTo('bar<');
-
-      expectTemplate('{{#if foo~}} bar {{~^~}} baz {{~/if}}').toCompileTo('baz');
-      expectTemplate('{{#if foo}} bar {{~^~}} baz {{/if}}').toCompileTo('baz ');
-      expectTemplate('{{#if foo~}} bar {{~^}} baz {{~/if}}').toCompileTo(' baz');
-      expectTemplate('{{#if foo~}} bar {{~^}} baz {{/if}}').toCompileTo(' baz ');
-      expectTemplate('{{#if foo~}} bar {{~else~}} baz {{~/if}}').toCompileTo('baz');
-      expectTemplate('\n\n{{~#if foo~}} \n\nbar \n\n{{~^~}} \n\nbaz \n\n{{~/if~}}\n\n').toCompileTo(
-        'baz'
-      );
-    });
-  });
-
-  it('should strip whitespace around partials', () => {
-    expectTemplate('foo {{~> dude~}} ').withPartials({ dude: 'bar' }).toCompileTo('foobar');
-    expectTemplate('foo {{> dude~}} ').withPartials({ dude: 'bar' }).toCompileTo('foo bar');
-    expectTemplate('foo {{> dude}} ').withPartials({ dude: 'bar' }).toCompileTo('foo bar ');
-    expectTemplate('foo\n {{~> dude}} ').withPartials({ dude: 'bar' }).toCompileTo('foobar');
-    expectTemplate('foo\n {{> dude}} ').withPartials({ dude: 'bar' }).toCompileTo('foo\n bar');
-  });
-
-  it('should only strip whitespace once', () => {
-    expectTemplate(' {{~foo~}} {{foo}} {{foo}} ')
-      .withInput({ foo: 'bar' })
-      .toCompileTo('barbar bar ');
-  });
-});
diff --git a/dev/lib/handlebars/src/symbols.ts b/dev/lib/handlebars/src/symbols.ts
deleted file mode 100644
index 85a8f2f3..00000000
--- a/dev/lib/handlebars/src/symbols.ts
+++ /dev/null
@@ -1,8 +0,0 @@
-/*
- * Elasticsearch B.V licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-export const kHelper = Symbol('helper');
-export const kAmbiguous = Symbol('ambiguous');
-export const kSimple = Symbol('simple');
diff --git a/dev/lib/handlebars/src/types.ts b/dev/lib/handlebars/src/types.ts
deleted file mode 100644
index 583170cb..00000000
--- a/dev/lib/handlebars/src/types.ts
+++ /dev/null
@@ -1,225 +0,0 @@
-/*
- * Elasticsearch B.V licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import { kHelper, kAmbiguous, kSimple } from './symbols';
-
-// Unexported `CompileOptions` lifted from node_modules/handlebars/types/index.d.ts
-// While it could also be extracted using `NonNullable<Parameters<typeof Handlebars.compile>[1]>`, this isn't possible since we declare the handlebars module below
-interface HandlebarsCompileOptions {
-  data?: boolean;
-  compat?: boolean;
-  knownHelpers?: KnownHelpers;
-  knownHelpersOnly?: boolean;
-  noEscape?: boolean;
-  strict?: boolean;
-  assumeObjects?: boolean;
-  preventIndent?: boolean;
-  ignoreStandalone?: boolean;
-  explicitPartialContext?: boolean;
-}
-
-/**
- * A custom version of the Handlebars module with an extra `compileAST` function and fixed typings.
- */
-declare module 'handlebars' {
-  /**
-   * Compiles the given Handlebars template without the use of `eval`.
-   *
-   * @returns A render function with the same API as the return value from the regular Handlebars `compile` function.
-   */
-  export function compileAST(
-    input: string | hbs.AST.Program,
-    options?: CompileOptions
-  ): TemplateDelegateFixed;
-
-  // --------------------------------------------------------
-  // Override/Extend inherited funcions and interfaces below that are incorrect.
-  //
-  // Any exported `const` or `type` types can't be overwritten, so we'll just
-  // have to live with those and cast them to the correct types in our code.
-  // Some of these fixed types, we'll instead export outside the scope of this
-  // 'handlebars' module so consumers of @kbn/handlebars at least have a way to
-  // access the correct types.
-  // --------------------------------------------------------
-
-  /**
-   * A {@link https://handlebarsjs.com/api-reference/helpers.html helper-function} type.
-   *
-   * When registering a helper function, it should be of this type.
-   */
-  export interface HelperDelegate extends HelperDelegateFixed {} // eslint-disable-line @typescript-eslint/no-empty-interface
-
-  /**
-   * A template-function type.
-   *
-   * This type is primarily used for the return value of by calls to
-   * {@link https://handlebarsjs.com/api-reference/compilation.html#handlebars-compile-template-options Handlebars.compile},
-   * Handlebars.compileAST and {@link https://handlebarsjs.com/api-reference/compilation.html#handlebars-precompile-template-options Handlebars.template}.
-   */
-  export interface TemplateDelegate<T = any> extends TemplateDelegateFixed<T> {} // eslint-disable-line @typescript-eslint/no-empty-interface
-
-  /**
-   * Register one or more {@link https://handlebarsjs.com/api-reference/runtime.html#handlebars-registerpartial-name-partial partials}.
-   *
-   * @param spec A key/value object where each key is the name of a partial (a string) and each value is the partial (either a string or a partial function).
-   */
-  export function registerPartial(spec: Record<string, TemplateFixed>): void; // Ensure `spec` object values can be strings
-}
-
-/**
- * Supported Handlebars compile options.
- *
- * This is a subset of all the compile options supported by the upstream
- * Handlebars module.
- */
-export type CompileOptions = Pick<
-  HandlebarsCompileOptions,
-  | 'data'
-  | 'knownHelpers'
-  | 'knownHelpersOnly'
-  | 'noEscape'
-  | 'strict'
-  | 'assumeObjects'
-  | 'preventIndent'
-  | 'explicitPartialContext'
->;
-
-/**
- * Supported Handlebars runtime options
- *
- * This is a subset of all the runtime options supported by the upstream
- * Handlebars module.
- */
-export interface RuntimeOptions extends Pick<Handlebars.RuntimeOptions, 'data' | 'blockParams'> {
-  // The upstream `helpers` property is too loose and allows all functions.
-  helpers?: HelpersHash;
-  // The upstream `partials` property is incorrectly typed and doesn't allow
-  // partials to be strings.
-  partials?: PartialsHash;
-  // The upstream `decorators` property is too loose and allows all functions.
-  decorators?: DecoratorsHash;
-}
-
-/**
- * The last argument being passed to a helper function is a an {@link https://handlebarsjs.com/api-reference/helpers.html#the-options-parameter options object}.
- */
-export interface HelperOptions extends Omit<Handlebars.HelperOptions, 'fn' | 'inverse'> {
-  name: string;
-  fn: TemplateDelegateFixed;
-  inverse: TemplateDelegateFixed;
-  loc: { start: hbs.AST.SourceLocation['start']; end: hbs.AST.SourceLocation['end'] };
-  lookupProperty: LookupProperty;
-}
-
-// Use the post-fix `Fixed` to allow us to acces it inside the 'handlebars' module declared above
-/**
- * A {@link https://handlebarsjs.com/api-reference/helpers.html helper-function} type.
- *
- * When registering a helper function, it should be of this type.
- */
-interface HelperDelegateFixed {
-  // eslint-disable-next-line @typescript-eslint/prefer-function-type
-  (...params: any[]): any;
-}
-export type { HelperDelegateFixed as HelperDelegate };
-
-// Use the post-fix `Fixed` to allow us to acces it inside the 'handlebars' module declared above
-/**
- * A template-function type.
- *
- * This type is primarily used for the return value of by calls to
- * {@link https://handlebarsjs.com/api-reference/compilation.html#handlebars-compile-template-options Handlebars.compile},
- * Handlebars.compileAST and {@link https://handlebarsjs.com/api-reference/compilation.html#handlebars-precompile-template-options Handlebars.template}.
- */
-interface TemplateDelegateFixed<T = any> {
-  (context?: T, options?: RuntimeOptions): string; // Override to ensure `context` is optional
-  blockParams?: number; // TODO: Can this really be optional?
-  partials?: PartialsHash;
-}
-export type { TemplateDelegateFixed as TemplateDelegate };
-
-// According to the decorator docs
-// (https://github.com/handlebars-lang/handlebars.js/blob/4.x/docs/decorators-api.md)
-// a decorator will be called with a different set of arugments than what's
-// actually happening in the upstream code. So here I assume that the docs are
-// wrong and that the upstream code is correct. In reality, `context` is the
-// last 4 documented arguments rolled into one object.
-/**
- * A {@link https://github.com/handlebars-lang/handlebars.js/blob/master/docs/decorators-api.md decorator-function} type.
- *
- * When registering a decorator function, it should be of this type.
- */
-export type DecoratorDelegate = (
-  prog: TemplateDelegateFixed,
-  props: Record<string, any>,
-  container: Container,
-  options: any
-) => any;
-
-// -----------------------------------------------------------------------------
-// INTERNAL TYPES
-// -----------------------------------------------------------------------------
-
-export type NodeType = typeof kHelper | typeof kAmbiguous | typeof kSimple;
-
-type LookupProperty = <T = any>(parent: Record<string, any>, propertyName: string) => T;
-
-export type NonBlockHelperOptions = Omit<HelperOptions, 'fn' | 'inverse'>;
-export type AmbiguousHelperOptions = HelperOptions | NonBlockHelperOptions;
-
-export type ProcessableStatementNode =
-  | hbs.AST.MustacheStatement
-  | hbs.AST.PartialStatement
-  | hbs.AST.SubExpression;
-export type ProcessableBlockStatementNode = hbs.AST.BlockStatement | hbs.AST.PartialBlockStatement;
-export type ProcessableNode = ProcessableStatementNode | ProcessableBlockStatementNode;
-export type ProcessableNodeWithPathParts = ProcessableNode & { path: hbs.AST.PathExpression };
-export type ProcessableNodeWithPathPartsOrLiteral = ProcessableNode & {
-  path: hbs.AST.PathExpression | hbs.AST.Literal;
-};
-
-export type HelpersHash = Record<string, HelperDelegateFixed>;
-export type PartialsHash = Record<string, TemplateFixed>;
-export type DecoratorsHash = Record<string, DecoratorDelegate>;
-
-// Use the post-fix `Fixed` to allow us to acces it inside the 'handlebars' module declared above
-type TemplateFixed = TemplateDelegateFixed | string;
-export type { TemplateFixed as Template };
-
-export interface DecoratorOptions extends Omit<HelperOptions, 'lookupProperties'> {
-  args?: any[];
-}
-
-export interface VisitorHelper {
-  fn?: HelperDelegateFixed;
-  context: any[];
-  params: any[];
-  options: AmbiguousHelperOptions;
-}
-
-export interface ResolvePartialOptions
-  extends Omit<Handlebars.ResolvePartialOptions, 'helpers' | 'partials' | 'decorators'> {
-  // The upstream `helpers` property is too loose and allows all functions.
-  helpers?: HelpersHash;
-  // The upstream `partials` property is incorrectly typed and doesn't allow
-  // partials to be strings.
-  partials?: PartialsHash;
-  // The upstream `decorators` property is too loose and allows all functions.
-  decorators?: DecoratorsHash;
-}
-
-export interface Container {
-  helpers: HelpersHash;
-  partials: PartialsHash;
-  decorators: DecoratorsHash;
-  strict: (obj: Record<string, any>, name: string, loc: hbs.AST.SourceLocation) => any;
-  lookupProperty: LookupProperty;
-  lambda: (current: any, context: any) => any;
-  data: (value: any, depth: number) => any;
-  hooks: {
-    helperMissing?: HelperDelegateFixed;
-    blockHelperMissing?: HelperDelegateFixed;
-  };
-}
diff --git a/dev/lib/handlebars/src/utils.ts b/dev/lib/handlebars/src/utils.ts
deleted file mode 100644
index f55bd98a..00000000
--- a/dev/lib/handlebars/src/utils.ts
+++ /dev/null
@@ -1,69 +0,0 @@
-/*
- * Elasticsearch B.V licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-// @ts-expect-error: Could not find a declaration file for module
-import { createFrame } from 'handlebars/dist/cjs/handlebars/utils';
-
-import type { AmbiguousHelperOptions, DecoratorOptions } from './types';
-
-export function isBlock(node: hbs.AST.Node): node is hbs.AST.BlockStatement {
-  return 'program' in node || 'inverse' in node;
-}
-
-export function isDecorator(
-  node: hbs.AST.Node
-): node is hbs.AST.Decorator | hbs.AST.DecoratorBlock {
-  return node.type === 'Decorator' || node.type === 'DecoratorBlock';
-}
-
-export function toDecoratorOptions(options: AmbiguousHelperOptions) {
-  // There's really no tests/documentation on this, but to match the upstream codebase we'll remove `lookupProperty` from the decorator context
-  delete (options as any).lookupProperty;
-
-  return options as DecoratorOptions;
-}
-
-export function noop() {
-  return '';
-}
-
-// liftet from handlebars lib/handlebars/runtime.js
-export function initData(context: any, data: any) {
-  if (!data || !('root' in data)) {
-    data = data ? createFrame(data) : {};
-    data.root = context;
-  }
-  return data;
-}
-
-// liftet from handlebars lib/handlebars/compiler/compiler.js
-export function transformLiteralToPath(node: { path: hbs.AST.PathExpression | hbs.AST.Literal }) {
-  const pathIsLiteral = 'parts' in node.path === false;
-
-  if (pathIsLiteral) {
-    const literal = node.path;
-    // @ts-expect-error: Not all `hbs.AST.Literal` sub-types has an `original` property, but that's ok, in that case we just want `undefined`
-    const original = literal.original;
-    // Casting to string here to make false and 0 literal values play nicely with the rest
-    // of the system.
-    node.path = {
-      type: 'PathExpression',
-      data: false,
-      depth: 0,
-      parts: [original + ''],
-      original: original + '',
-      loc: literal.loc,
-    };
-  }
-}
-
-export function allowUnsafeEval() {
-  try {
-    new Function();
-    return true;
-  } catch (e) {
-    return false;
-  }
-}
diff --git a/dev/lib/handlebars/src/visitor.ts b/dev/lib/handlebars/src/visitor.ts
deleted file mode 100644
index 1842c8e5..00000000
--- a/dev/lib/handlebars/src/visitor.ts
+++ /dev/null
@@ -1,778 +0,0 @@
-/*
- * Elasticsearch B.V licenses this file to you under the MIT License.
- * See `packages/kbn-handlebars/LICENSE` for more information.
- */
-
-import Handlebars from 'handlebars';
-import {
-  createProtoAccessControl,
-  resultIsAllowed,
-  // @ts-expect-error: Could not find a declaration file for module
-} from 'handlebars/dist/cjs/handlebars/internal/proto-access';
-// @ts-expect-error: Could not find a declaration file for module
-import AST from 'handlebars/dist/cjs/handlebars/compiler/ast';
-// @ts-expect-error: Could not find a declaration file for module
-import { indexOf, createFrame } from 'handlebars/dist/cjs/handlebars/utils';
-// @ts-expect-error: Could not find a declaration file for module
-import { moveHelperToHooks } from 'handlebars/dist/cjs/handlebars/helpers';
-
-import type {
-  AmbiguousHelperOptions,
-  CompileOptions,
-  Container,
-  DecoratorDelegate,
-  DecoratorsHash,
-  HelperOptions,
-  NodeType,
-  NonBlockHelperOptions,
-  ProcessableBlockStatementNode,
-  ProcessableNode,
-  ProcessableNodeWithPathParts,
-  ProcessableNodeWithPathPartsOrLiteral,
-  ProcessableStatementNode,
-  ResolvePartialOptions,
-  RuntimeOptions,
-  Template,
-  TemplateDelegate,
-  VisitorHelper,
-} from './types';
-import { kAmbiguous, kHelper, kSimple } from './symbols';
-import {
-  initData,
-  isBlock,
-  isDecorator,
-  noop,
-  toDecoratorOptions,
-  transformLiteralToPath,
-} from './utils';
-
-export class ElasticHandlebarsVisitor extends Handlebars.Visitor {
-  private env: typeof Handlebars;
-  private contexts: any[] = [];
-  private output: any[] = [];
-  private template?: string;
-  private compileOptions: CompileOptions;
-  private runtimeOptions?: RuntimeOptions;
-  private blockParamNames: any[][] = [];
-  private blockParamValues: any[][] = [];
-  private ast?: hbs.AST.Program;
-  private container: Container;
-  private defaultHelperOptions: Pick<NonBlockHelperOptions, 'lookupProperty'>;
-  private processedRootDecorators = false; // Root decorators should not have access to input arguments. This flag helps us detect them.
-  private processedDecoratorsForProgram = new Set(); // It's important that a given program node only has its decorators run once, we use this Map to keep track of them
-
-  constructor(
-    env: typeof Handlebars,
-    input: string | hbs.AST.Program,
-    options: CompileOptions = {}
-  ) {
-    super();
-
-    this.env = env;
-
-    if (typeof input !== 'string' && input.type === 'Program') {
-      this.ast = input;
-    } else {
-      this.template = input as string;
-    }
-
-    this.compileOptions = { data: true, ...options };
-    this.compileOptions.knownHelpers = Object.assign(
-      Object.create(null),
-      {
-        helperMissing: true,
-        blockHelperMissing: true,
-        each: true,
-        if: true,
-        unless: true,
-        with: true,
-        log: true,
-        lookup: true,
-      },
-      this.compileOptions.knownHelpers
-    );
-
-    const protoAccessControl = createProtoAccessControl({});
-
-    const container: Container = (this.container = {
-      helpers: {},
-      partials: {},
-      decorators: {},
-      strict(obj, name, loc) {
-        if (!obj || !(name in obj)) {
-          throw new Handlebars.Exception('"' + name + '" not defined in ' + obj, {
-            loc,
-          } as hbs.AST.Node);
-        }
-        return container.lookupProperty(obj, name);
-      },
-      // this function is lifted from the handlebars source and slightly modified (lib/handlebars/runtime.js)
-      lookupProperty(parent, propertyName) {
-        const result = parent[propertyName];
-        if (result == null) {
-          return result;
-        }
-        if (Object.prototype.hasOwnProperty.call(parent, propertyName)) {
-          return result;
-        }
-
-        if (resultIsAllowed(result, protoAccessControl, propertyName)) {
-          return result;
-        }
-        return undefined;
-      },
-      // this function is lifted from the handlebars source and slightly modified (lib/handlebars/runtime.js)
-      lambda(current, context) {
-        return typeof current === 'function' ? current.call(context) : current;
-      },
-      data(value: any, depth: number) {
-        while (value && depth--) {
-          value = value._parent;
-        }
-        return value;
-      },
-      hooks: {},
-    });
-
-    this.defaultHelperOptions = {
-      lookupProperty: container.lookupProperty,
-    };
-  }
-
-  render(context: any, options: RuntimeOptions = {}): string {
-    this.contexts = [context];
-    this.output = [];
-    this.runtimeOptions = { ...options };
-    this.container.helpers = { ...this.env.helpers, ...options.helpers };
-    this.container.partials = { ...this.env.partials, ...options.partials };
-    this.container.decorators = {
-      ...(this.env.decorators as DecoratorsHash),
-      ...options.decorators,
-    };
-    this.container.hooks = {};
-    this.processedRootDecorators = false;
-    this.processedDecoratorsForProgram.clear();
-
-    if (this.compileOptions.data) {
-      this.runtimeOptions.data = initData(context, this.runtimeOptions.data);
-    }
-
-    const keepHelperInHelpers = false;
-    moveHelperToHooks(this.container, 'helperMissing', keepHelperInHelpers);
-    moveHelperToHooks(this.container, 'blockHelperMissing', keepHelperInHelpers);
-
-    if (!this.ast) {
-      this.ast = Handlebars.parse(this.template!);
-    }
-
-    // The `defaultMain` function contains the default behavior:
-    //
-    // Generate a "program" function based on the root `Program` in the AST and
-    // call it. This will start the processing of all the child nodes in the
-    // AST.
-    const defaultMain: TemplateDelegate = (_context) => {
-      const prog = this.generateProgramFunction(this.ast!);
-      return prog(_context, this.runtimeOptions);
-    };
-
-    // Run any decorators that might exist on the root:
-    //
-    // The `defaultMain` function is passed in, and if there are no root
-    // decorators, or if the decorators chooses to do so, the same function is
-    // returned from `processDecorators` and the default behavior is retained.
-    //
-    // Alternatively any of the root decorators might call the `defaultMain`
-    // function themselves, process its return value, and return a completely
-    // different `main` function.
-    const main = this.processDecorators(this.ast, defaultMain);
-    this.processedRootDecorators = true;
-
-    // Call the `main` function and add the result to the final output.
-    const result = main(this.context, options);
-
-    if (main === defaultMain) {
-      this.output.push(result);
-      return this.output.join('');
-    } else {
-      // We normally expect the return value of `main` to be a string. However,
-      // if a decorator is used to override the `defaultMain` function, the
-      // return value can be any type. To match the upstream handlebars project
-      // behavior, we want the result of rendering the template to be the
-      // literal value returned by the decorator.
-      //
-      // Since the output array in this case always will be empty, we just
-      // return that single value instead of attempting to join all the array
-      // elements as strings.
-      return result;
-    }
-  }
-
-  // ********************************************** //
-  // ***    Visitor AST Traversal Functions     *** //
-  // ********************************************** //
-
-  Program(program: hbs.AST.Program) {
-    this.blockParamNames.unshift(program.blockParams);
-    super.Program(program);
-    this.blockParamNames.shift();
-  }
-
-  MustacheStatement(mustache: hbs.AST.MustacheStatement) {
-    this.processStatementOrExpression(mustache);
-  }
-
-  BlockStatement(block: hbs.AST.BlockStatement) {
-    this.processStatementOrExpression(block);
-  }
-
-  PartialStatement(partial: hbs.AST.PartialStatement) {
-    this.invokePartial(partial);
-  }
-
-  PartialBlockStatement(partial: hbs.AST.PartialBlockStatement) {
-    this.invokePartial(partial);
-  }
-
-  // This space is intentionally left blank: We want to override the Visitor
-  // class implementation of this method, but since we handle decorators
-  // separately before traversing the nodes, we just want to make this a no-op.
-  DecoratorBlock(decorator: hbs.AST.DecoratorBlock) {}
-
-  // This space is intentionally left blank: We want to override the Visitor
-  // class implementation of this method, but since we handle decorators
-  // separately before traversing the nodes, we just want to make this a no-op.
-  Decorator(decorator: hbs.AST.Decorator) {}
-
-  SubExpression(sexpr: hbs.AST.SubExpression) {
-    this.processStatementOrExpression(sexpr);
-  }
-
-  PathExpression(path: hbs.AST.PathExpression) {
-    const blockParamId =
-      !path.depth && !AST.helpers.scopedId(path) && this.blockParamIndex(path.parts[0]);
-
-    let result;
-    if (blockParamId) {
-      result = this.lookupBlockParam(blockParamId, path);
-    } else if (path.data) {
-      result = this.lookupData(this.runtimeOptions!.data, path);
-    } else {
-      result = this.resolvePath(this.contexts[path.depth], path);
-    }
-
-    this.output.push(result);
-  }
-
-  ContentStatement(content: hbs.AST.ContentStatement) {
-    this.output.push(content.value);
-  }
-
-  StringLiteral(string: hbs.AST.StringLiteral) {
-    this.output.push(string.value);
-  }
-
-  NumberLiteral(number: hbs.AST.NumberLiteral) {
-    this.output.push(number.value);
-  }
-
-  BooleanLiteral(bool: hbs.AST.BooleanLiteral) {
-    this.output.push(bool.value);
-  }
-
-  UndefinedLiteral() {
-    this.output.push(undefined);
-  }
-
-  NullLiteral() {
-    this.output.push(null);
-  }
-
-  // ********************************************** //
-  // ***      Visitor AST Helper Functions      *** //
-  // ********************************************** //
-
-  /**
-   * Special code for decorators, since they have to be executed ahead of time (before the wrapping program).
-   * So we have to look into the program AST body and see if it contains any decorators that we have to process
-   * before we can finish processing of the wrapping program.
-   */
-  private processDecorators(program: hbs.AST.Program, prog: TemplateDelegate) {
-    if (!this.processedDecoratorsForProgram.has(program)) {
-      this.processedDecoratorsForProgram.add(program);
-      const props = {};
-      for (const node of program.body) {
-        if (isDecorator(node)) {
-          prog = this.processDecorator(node, prog, props);
-        }
-      }
-    }
-
-    return prog;
-  }
-
-  private processDecorator(
-    decorator: hbs.AST.DecoratorBlock | hbs.AST.Decorator,
-    prog: TemplateDelegate,
-    props: Record<string, any>
-  ) {
-    const options = this.setupDecoratorOptions(decorator);
-
-    const result = this.container.lookupProperty<DecoratorDelegate>(
-      this.container.decorators,
-      options.name
-    )(prog, props, this.container, options);
-
-    return Object.assign(result || prog, props);
-  }
-
-  private processStatementOrExpression(node: ProcessableNodeWithPathPartsOrLiteral) {
-    // Calling `transformLiteralToPath` has side-effects!
-    // It converts a node from type `ProcessableNodeWithPathPartsOrLiteral` to `ProcessableNodeWithPathParts`
-    transformLiteralToPath(node);
-
-    switch (this.classifyNode(node as ProcessableNodeWithPathParts)) {
-      case kSimple:
-        this.processSimpleNode(node as ProcessableNodeWithPathParts);
-        break;
-      case kHelper:
-        this.processHelperNode(node as ProcessableNodeWithPathParts);
-        break;
-      case kAmbiguous:
-        this.processAmbiguousNode(node as ProcessableNodeWithPathParts);
-        break;
-    }
-  }
-
-  // Liftet from lib/handlebars/compiler/compiler.js (original name: classifySexpr)
-  private classifyNode(node: { path: hbs.AST.PathExpression }): NodeType {
-    const isSimple = AST.helpers.simpleId(node.path);
-    const isBlockParam = isSimple && !!this.blockParamIndex(node.path.parts[0]);
-
-    // a mustache is an eligible helper if:
-    // * its id is simple (a single part, not `this` or `..`)
-    let isHelper = !isBlockParam && AST.helpers.helperExpression(node);
-
-    // if a mustache is an eligible helper but not a definite
-    // helper, it is ambiguous, and will be resolved in a later
-    // pass or at runtime.
-    let isEligible = !isBlockParam && (isHelper || isSimple);
-
-    // if ambiguous, we can possibly resolve the ambiguity now
-    // An eligible helper is one that does not have a complex path, i.e. `this.foo`, `../foo` etc.
-    if (isEligible && !isHelper) {
-      const name = node.path.parts[0];
-      const options = this.compileOptions;
-      if (options.knownHelpers && options.knownHelpers[name]) {
-        isHelper = true;
-      } else if (options.knownHelpersOnly) {
-        isEligible = false;
-      }
-    }
-
-    if (isHelper) {
-      return kHelper;
-    } else if (isEligible) {
-      return kAmbiguous;
-    } else {
-      return kSimple;
-    }
-  }
-
-  // Liftet from lib/handlebars/compiler/compiler.js
-  private blockParamIndex(name: string): [number, any] | undefined {
-    for (let depth = 0, len = this.blockParamNames.length; depth < len; depth++) {
-      const blockParams = this.blockParamNames[depth];
-      const param = blockParams && indexOf(blockParams, name);
-      if (blockParams && param >= 0) {
-        return [depth, param];
-      }
-    }
-  }
-
-  // Looks up the value of `parts` on the given block param and pushes
-  // it onto the stack.
-  private lookupBlockParam(blockParamId: [number, any], path: hbs.AST.PathExpression) {
-    const value = this.blockParamValues[blockParamId[0]][blockParamId[1]];
-    return this.resolvePath(value, path, 1);
-  }
-
-  // Push the data lookup operator
-  private lookupData(data: any, path: hbs.AST.PathExpression) {
-    if (path.depth) {
-      data = this.container.data(data, path.depth);
-    }
-
-    return this.resolvePath(data, path);
-  }
-
-  private processSimpleNode(node: ProcessableNodeWithPathParts) {
-    const path = node.path;
-    // @ts-expect-error strict is not a valid property on PathExpression, but we used in the same way it's also used in the original handlebars
-    path.strict = true;
-    const result = this.resolveNodes(path)[0];
-    const lambdaResult = this.container.lambda(result, this.context);
-
-    if (isBlock(node)) {
-      this.blockValue(node, lambdaResult);
-    } else {
-      this.output.push(lambdaResult);
-    }
-  }
-
-  // The purpose of this opcode is to take a block of the form
-  // `{{#this.foo}}...{{/this.foo}}`, resolve the value of `foo`, and
-  // replace it on the stack with the result of properly
-  // invoking blockHelperMissing.
-  private blockValue(node: hbs.AST.BlockStatement, value: any) {
-    const name = node.path.original;
-    const options = this.setupParams(node, name);
-
-    const result = this.container.hooks.blockHelperMissing!.call(this.context, value, options);
-
-    this.output.push(result);
-  }
-
-  private processHelperNode(node: ProcessableNodeWithPathParts) {
-    const path = node.path;
-    const name = path.parts[0];
-
-    if (this.compileOptions.knownHelpers && this.compileOptions.knownHelpers[name]) {
-      this.invokeKnownHelper(node);
-    } else if (this.compileOptions.knownHelpersOnly) {
-      throw new Handlebars.Exception(
-        'You specified knownHelpersOnly, but used the unknown helper ' + name,
-        node
-      );
-    } else {
-      this.invokeHelper(node);
-    }
-  }
-
-  // This operation is used when the helper is known to exist,
-  // so a `helperMissing` fallback is not required.
-  private invokeKnownHelper(node: ProcessableNodeWithPathParts) {
-    const name = node.path.parts[0];
-    const helper = this.setupHelper(node, name);
-    // TypeScript: `helper.fn` might be `undefined` at this point, but to match the upstream behavior we call it without any guards
-    const result = helper.fn!.call(helper.context, ...helper.params, helper.options);
-    this.output.push(result);
-  }
-
-  // Pops off the helper's parameters, invokes the helper,
-  // and pushes the helper's return value onto the stack.
-  //
-  // If the helper is not found, `helperMissing` is called.
-  private invokeHelper(node: ProcessableNodeWithPathParts) {
-    const path = node.path;
-    const name = path.original;
-    const isSimple = AST.helpers.simpleId(path);
-    const helper = this.setupHelper(node, name);
-
-    const loc = isSimple && helper.fn ? node.loc : path.loc;
-    helper.fn = (isSimple && helper.fn) || this.resolveNodes(path)[0];
-
-    if (!helper.fn) {
-      if (this.compileOptions.strict) {
-        helper.fn = this.container.strict(helper.context, name, loc);
-      } else {
-        helper.fn = this.container.hooks.helperMissing;
-      }
-    }
-
-    // TypeScript: `helper.fn` might be `undefined` at this point, but to match the upstream behavior we call it without any guards
-    const result = helper.fn!.call(helper.context, ...helper.params, helper.options);
-
-    this.output.push(result);
-  }
-
-  private invokePartial(partial: hbs.AST.PartialStatement | hbs.AST.PartialBlockStatement) {
-    const { params } = partial;
-    if (params.length > 1) {
-      throw new Handlebars.Exception(
-        `Unsupported number of partial arguments: ${params.length}`,
-        partial
-      );
-    }
-
-    const isDynamic = partial.name.type === 'SubExpression';
-    const name = isDynamic
-      ? this.resolveNodes(partial.name).join('')
-      : (partial.name as hbs.AST.PathExpression).original;
-
-    const options: AmbiguousHelperOptions & ResolvePartialOptions = this.setupParams(partial, name);
-    options.helpers = this.container.helpers;
-    options.partials = this.container.partials;
-    options.decorators = this.container.decorators;
-
-    let partialBlock;
-    if ('fn' in options && options.fn !== noop) {
-      const { fn } = options;
-      const currentPartialBlock = options.data?.['partial-block'];
-      options.data = createFrame(options.data);
-
-      // Wrapper function to get access to currentPartialBlock from the closure
-      partialBlock = options.data['partial-block'] = function partialBlockWrapper(
-        context: any,
-        wrapperOptions: { data?: HelperOptions['data'] } = {}
-      ) {
-        // Restore the partial-block from the closure for the execution of the block
-        // i.e. the part inside the block of the partial call.
-        wrapperOptions.data = createFrame(wrapperOptions.data);
-        wrapperOptions.data['partial-block'] = currentPartialBlock;
-        return fn(context, wrapperOptions);
-      };
-
-      if (fn.partials) {
-        options.partials = { ...options.partials, ...fn.partials };
-      }
-    }
-
-    let context = {};
-    if (params.length === 0 && !this.compileOptions.explicitPartialContext) {
-      context = this.context;
-    } else if (params.length === 1) {
-      context = this.resolveNodes(params[0])[0];
-    }
-
-    if (Object.keys(options.hash).length > 0) {
-      // TODO: context can be an array, but maybe never when we have a hash???
-      context = Object.assign({}, context, options.hash);
-    }
-
-    const partialTemplate: Template | undefined =
-      this.container.partials[name] ??
-      partialBlock ??
-      // TypeScript note: We extend ResolvePartialOptions in our types.ts file
-      // to fix an error in the upstream type. When calling back into the
-      // upstream code, we just cast back to the non-extended type
-      Handlebars.VM.resolvePartial(
-        undefined,
-        undefined,
-        options as Handlebars.ResolvePartialOptions
-      );
-
-    if (partialTemplate === undefined) {
-      throw new Handlebars.Exception(`The partial ${name} could not be found`);
-    }
-
-    let render;
-    if (typeof partialTemplate === 'string') {
-      render = this.env.compileAST(partialTemplate, this.compileOptions);
-      if (name in this.container.partials) {
-        this.container.partials[name] = render;
-      }
-    } else {
-      render = partialTemplate;
-    }
-
-    let result = render(context, options);
-
-    if ('indent' in partial) {
-      result =
-        partial.indent +
-        (this.compileOptions.preventIndent
-          ? result
-          : result.replace(/\n(?!$)/g, `\n${partial.indent}`)); // indent each line, ignoring any trailing linebreak
-    }
-
-    this.output.push(result);
-  }
-
-  private processAmbiguousNode(node: ProcessableNodeWithPathParts) {
-    const name = node.path.parts[0];
-    const helper = this.setupHelper(node, name);
-    let { fn: helperFn } = helper;
-
-    const loc = helperFn ? node.loc : node.path.loc;
-    helperFn = helperFn ?? this.resolveNodes(node.path)[0];
-
-    if (helperFn === undefined) {
-      if (this.compileOptions.strict) {
-        helperFn = this.container.strict(helper.context, name, loc);
-      } else {
-        helperFn =
-          helper.context != null
-            ? this.container.lookupProperty(helper.context, name)
-            : helper.context;
-        if (helperFn == null) helperFn = this.container.hooks.helperMissing;
-      }
-    }
-
-    const helperResult =
-      typeof helperFn === 'function'
-        ? helperFn.call(helper.context, ...helper.params, helper.options)
-        : helperFn;
-
-    if (isBlock(node)) {
-      const result = helper.fn
-        ? helperResult
-        : this.container.hooks.blockHelperMissing!.call(this.context, helperResult, helper.options);
-      if (result != null) {
-        this.output.push(result);
-      }
-    } else {
-      if (
-        (node as hbs.AST.MustacheStatement).escaped === false ||
-        this.compileOptions.noEscape === true ||
-        typeof helperResult !== 'string'
-      ) {
-        this.output.push(helperResult);
-      } else {
-        this.output.push(Handlebars.escapeExpression(helperResult));
-      }
-    }
-  }
-
-  private setupHelper(node: ProcessableNode, helperName: string): VisitorHelper {
-    return {
-      fn: this.container.lookupProperty(this.container.helpers, helperName),
-      context: this.context,
-      params: this.resolveNodes(node.params),
-      options: this.setupParams(node, helperName),
-    };
-  }
-
-  private setupDecoratorOptions(decorator: hbs.AST.Decorator | hbs.AST.DecoratorBlock) {
-    // TypeScript: The types indicate that `decorator.path` technically can be an `hbs.AST.Literal`. However, the upstream codebase always treats it as an `hbs.AST.PathExpression`, so we do too.
-    const name = (decorator.path as hbs.AST.PathExpression).original;
-    const options = toDecoratorOptions(this.setupParams(decorator, name));
-
-    if (decorator.params.length > 0) {
-      if (!this.processedRootDecorators) {
-        // When processing the root decorators, temporarily remove the root context so it's not accessible to the decorator
-        const context = this.contexts.shift();
-        options.args = this.resolveNodes(decorator.params);
-        this.contexts.unshift(context);
-      } else {
-        options.args = this.resolveNodes(decorator.params);
-      }
-    } else {
-      options.args = [];
-    }
-
-    return options;
-  }
-
-  private setupParams(node: ProcessableBlockStatementNode, name: string): HelperOptions;
-  private setupParams(node: ProcessableStatementNode, name: string): NonBlockHelperOptions;
-  private setupParams(node: ProcessableNode, name: string): AmbiguousHelperOptions;
-  private setupParams(node: ProcessableNode, name: string) {
-    const options: AmbiguousHelperOptions = {
-      name,
-      hash: this.getHash(node),
-      data: this.runtimeOptions!.data,
-      loc: { start: node.loc.start, end: node.loc.end },
-      ...this.defaultHelperOptions,
-    };
-
-    if (isBlock(node)) {
-      (options as HelperOptions).fn = node.program
-        ? this.processDecorators(node.program, this.generateProgramFunction(node.program))
-        : noop;
-      (options as HelperOptions).inverse = node.inverse
-        ? this.processDecorators(node.inverse, this.generateProgramFunction(node.inverse))
-        : noop;
-    }
-
-    return options;
-  }
-
-  private generateProgramFunction(program: hbs.AST.Program) {
-    if (!program) return noop;
-
-    const prog: TemplateDelegate = (nextContext: any, runtimeOptions: RuntimeOptions = {}) => {
-      runtimeOptions = { ...runtimeOptions };
-
-      // inherit data in blockParams from parent program
-      runtimeOptions.data = runtimeOptions.data || this.runtimeOptions!.data;
-      if (runtimeOptions.blockParams) {
-        runtimeOptions.blockParams = runtimeOptions.blockParams.concat(
-          this.runtimeOptions!.blockParams
-        );
-      }
-
-      // inherit partials from parent program
-      runtimeOptions.partials = runtimeOptions.partials || this.runtimeOptions!.partials;
-
-      // stash parent program data
-      const tmpRuntimeOptions = this.runtimeOptions;
-      this.runtimeOptions = runtimeOptions;
-      const shiftContext = nextContext !== this.context;
-      if (shiftContext) this.contexts.unshift(nextContext);
-      this.blockParamValues.unshift(runtimeOptions.blockParams || []);
-
-      // execute child program
-      const result = this.resolveNodes(program).join('');
-
-      // unstash parent program data
-      this.blockParamValues.shift();
-      if (shiftContext) this.contexts.shift();
-      this.runtimeOptions = tmpRuntimeOptions;
-
-      // return result of child program
-      return result;
-    };
-
-    prog.blockParams = program.blockParams?.length ?? 0;
-    return prog;
-  }
-
-  private getHash(statement: { hash?: hbs.AST.Hash }) {
-    const result: { [key: string]: any } = {};
-    if (!statement.hash) return result;
-    for (const { key, value } of statement.hash.pairs) {
-      result[key] = this.resolveNodes(value)[0];
-    }
-    return result;
-  }
-
-  private resolvePath(obj: any, path: hbs.AST.PathExpression, index = 0) {
-    if (this.compileOptions.strict || this.compileOptions.assumeObjects) {
-      return this.strictLookup(obj, path);
-    }
-
-    for (; index < path.parts.length; index++) {
-      if (obj == null) return;
-      obj = this.container.lookupProperty(obj, path.parts[index]);
-    }
-
-    return obj;
-  }
-
-  private strictLookup(obj: any, path: hbs.AST.PathExpression) {
-    // @ts-expect-error strict is not a valid property on PathExpression, but we used in the same way it's also used in the original handlebars
-    const requireTerminal = this.compileOptions.strict && path.strict;
-    const len = path.parts.length - (requireTerminal ? 1 : 0);
-
-    for (let i = 0; i < len; i++) {
-      obj = this.container.lookupProperty(obj, path.parts[i]);
-    }
-
-    if (requireTerminal) {
-      return this.container.strict(obj, path.parts[len], path.loc);
-    } else {
-      return obj;
-    }
-  }
-
-  private resolveNodes(nodes: hbs.AST.Node | hbs.AST.Node[]): any[] {
-    const currentOutput = this.output;
-    this.output = [];
-
-    if (Array.isArray(nodes)) {
-      this.acceptArray(nodes);
-    } else {
-      this.accept(nodes);
-    }
-
-    const result = this.output;
-
-    this.output = currentOutput;
-
-    return result;
-  }
-
-  private get context() {
-    return this.contexts[0];
-  }
-}
diff --git a/dev/lib/handlebars/tsconfig.json b/dev/lib/handlebars/tsconfig.json
deleted file mode 100644
index 3f139716..00000000
--- a/dev/lib/handlebars/tsconfig.json
+++ /dev/null
@@ -1,15 +0,0 @@
-{
-  "compilerOptions": {
-    "outDir": "target/types",
-    "types": [
-      "jest",
-      "node"
-    ]
-  },
-  "include": [
-    "**/*.ts"
-  ],
-  "exclude": [
-    "target/**/*",
-  ]
-}