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diff --git a/dev/lib/handlebars/src/spec/index.blocks.test.ts b/dev/lib/handlebars/src/spec/index.blocks.test.ts
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+/*
+ * 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');
+      });
+    });
+  });
+});