{"id":16351577,"url":"https://github.com/tomeraberbach/weak-merge","last_synced_at":"2025-03-16T15:31:49.923Z","repository":{"id":98940863,"uuid":"341430602","full_name":"TomerAberbach/weak-merge","owner":"TomerAberbach","description":"🔗 A module for merging WeakSets and 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align=\"center\"\u003e\n  weak-merge\n\u003c/h1\u003e\n\n\u003cdiv align=\"center\"\u003e\n  \u003ca href=\"https://npmjs.org/package/weak-merge\"\u003e\n    \u003cimg src=\"https://badgen.net/npm/v/weak-merge\" alt=\"version\" /\u003e\n  \u003c/a\u003e\n  \u003ca href=\"https://github.com/TomerAberbach/weak-merge/actions\"\u003e\n    \u003cimg src=\"https://github.com/TomerAberbach/weak-merge/workflows/CI/badge.svg\" alt=\"CI\" /\u003e\n  \u003c/a\u003e\n  \u003ca href=\"https://unpkg.com/weak-merge/dist/index.min.js\"\u003e\n    \u003cimg src=\"https://deno.bundlejs.com/?q=weak-merge\u0026badge\" alt=\"gzip size\" /\u003e\n  \u003c/a\u003e\n  \u003ca href=\"https://unpkg.com/weak-merge/dist/index.min.js\"\u003e\n    \u003cimg src=\"https://deno.bundlejs.com/?q=weak-merge\u0026config={%22compression%22:{%22type%22:%22brotli%22}}\u0026badge\" alt=\"brotli size\" /\u003e\n  \u003c/a\u003e\n  \u003ca href=\"https://github.com/sponsors/TomerAberbach\"\u003e\n    \u003cimg src=\"https://img.shields.io/static/v1?label=Sponsor\u0026message=%E2%9D%A4\u0026logo=GitHub\u0026color=%23fe8e86\" alt=\"Sponsor\"\u003e\n  \u003c/a\u003e\n\u003c/div\u003e\n\n\u003cdiv align=\"center\"\u003e\n  A module for merging WeakSets and WeakMaps.\n\u003c/div\u003e\n\n## Install\n\n```sh\n$ npm i weak-merge\n```\n\n## Usage\n\n```js\nimport { mergeWeakMaps, mergeWeakSets } from 'weak-merge'\n\nconst [a, b, c, d] = [{}, {}, {}, {}]\n\nconst weakSet1 = new WeakSet([a, b])\nconst weakSet2 = new WeakSet([c])\n\nconst mergedWeakSet = mergeWeakSets(weakSet1, weakSet2)\n\nconsole.log([a, b, c].map(key =\u003e mergedWeakSet.has(key)))\n//=\u003e [ true, true, true ]\n\nmergedWeakSet.delete(a)\nconsole.log(mergedWeakSet.has(a))\n//=\u003e false\n\nconsole.log(weakSet1.has(a))\n//=\u003e true\n\nmergedWeakSet.add(d)\nconsole.log(mergedWeakSet.has(d))\n//=\u003e true\n\nconsole.log(weakSet1.has(d))\n//=\u003e false\n\nconst weakMap1 = new WeakMap([\n  [a, 1],\n  [b, 2],\n])\nconst weakMap2 = new WeakMap([[c, 3]])\n\nconst mergedWeakMap = mergeWeakMaps(weakMap1, weakMap2)\n\nconsole.log([a, b, c].map(key =\u003e mergedWeakMap.get(key)))\n//=\u003e [ 1, 2, 3 ]\n\nmergedWeakMap.delete(a)\nconsole.log(mergedWeakMap.has(a))\n//=\u003e false\n\nconsole.log(weakMap1.has(a))\n//=\u003e true\n\nmergedWeakMap.set(a, 5)\nconsole.log(mergedWeakMap.get(a))\n//=\u003e 5\n\nconsole.log(weakMap1.get(a))\n//=\u003e 1\n```\n\nSee the\n[TypeScript types](https://github.com/TomerAberbach/weak-merge/blob/main/src/index.d.ts)\nfor more documentation.\n\n## Why?\n\nMerging `WeakSet` or `WeakMap` instances is not trivial because they\n[are not enumerable](https://javascript.info/weakmap-weakset).\n\n## Performance\n\n`WeakSet` instances returned from `mergeWeakSets` and `WeakMap` instances\nreturned from `mergeWeakMaps` are not as performant as native `WeakSet` and\n`WeakMap` instances (due to the lack of a native way to merge or copy `WeakSet`\nand `WeakMap` instances):\n\n### `WeakSet` Time Complexity\n\n| Operation | Native `WeakSet` | Merge of `n` native `WeakSet` instances |\n| --------- | ---------------- | --------------------------------------- |\n| `add`     | `O(1)`           | `O(1)`                                  |\n| `delete`  | `O(1)`           | `O(1)`                                  |\n| `has`     | `O(1)`           | `O(n)`                                  |\n\n### `WeakMap` Time Complexity\n\n| Operation | Native `WeakMap` | Merge of `n` native `WeakMap` instances |\n| --------- | ---------------- | --------------------------------------- |\n| `delete`  | `O(1)`           | `O(1)`                                  |\n| `get`     | `O(1)`           | `O(n)`                                  |\n| `has`     | `O(1)`           | `O(n)`                                  |\n| `set`     | `O(1)`           | `O(1)`                                  |\n\n## Contributing\n\nStars are always welcome!\n\nFor bugs and feature requests,\n[please create an issue](https://github.com/TomerAberbach/weak-merge/issues/new).\n\nFor pull requests, please read the\n[contributing guidelines](https://github.com/TomerAberbach/weak-merge/blob/main/contributing.md).\n\n## License\n\n[Apache License 2.0](https://github.com/TomerAberbach/weak-merge/blob/main/license)\n\nThis is not an official Google product.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ftomeraberbach%2Fweak-merge","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Ftomeraberbach%2Fweak-merge","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ftomeraberbach%2Fweak-merge/lists"}