refactor: improve setup of type declaration files (#5914)

packages/docusaurus-utils-common/src/__tests__/uniq.test.ts

@@ -1,33 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-import uniq from '../uniq';
-
-describe('uniq', () => {
-  test('remove duplicate primitives', () => {
-    expect(uniq(['A', 'B', 'C', 'B', 'A', 'D'])).toEqual(['A', 'B', 'C', 'D']);
-    expect(uniq([3, 3, 5, 1, 6, 3, 5])).toEqual([3, 5, 1, 6]);
-    expect(uniq([null, undefined, 3, null, 4, 3])).toEqual([
-      null,
-      undefined,
-      3,
-      4,
-    ]);
-  });
-
-  test('remove duplicate objects/arrays by identity', () => {
-    const obj1 = {};
-    const obj2 = {};
-    const obj3 = {};
-    const array1: unknown[] = [];
-    const array2: unknown[] = [];
-    const array3: unknown[] = [];
-    expect(
-      uniq([obj1, obj1, obj2, array1, obj2, array3, array2, array1, obj3]),
-    ).toEqual([obj1, obj2, array1, array3, array2, obj3]);
-  });
-});

packages/docusaurus-utils-common/src/index.ts

@@ -7,5 +7,3 @@
 
 export {default as applyTrailingSlash} from './applyTrailingSlash';
 export type {ApplyTrailingSlashParams} from './applyTrailingSlash';
-
-export {default as uniq} from './uniq';

packages/docusaurus-utils-common/src/uniq.ts

@@ -1,12 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-// Remove duplicate array items (similar to _.uniq)
-export default function uniq<T>(array: T[]): T[] {
-  // Note: had problems with [...new Set()]: https://github.com/facebook/docusaurus/issues/4972#issuecomment-863895061
-  return Array.from(new Set(array));
-}