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diff --git a/dev/lib/handlebars/src/spec/index.regressions.test.ts b/dev/lib/handlebars/src/spec/index.regressions.test.ts
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--- a/dev/lib/handlebars/src/spec/index.regressions.test.ts
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@@ -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');
-    });
-  });
-});