kbn-handlebars dependency update (#613)

* Update kbn-handlebars dependency

* Move handlebars dependency to dev

* Update package

* Update readme

* Update readme

* Ignore legal file

14 files changed, 0 insertions, 4429 deletions

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 ');
-  });
-});