{"id":13339483,"url":"https://github.com/syntax-tree/unist-util-find-before","last_synced_at":"2025-06-29T22:03:40.125Z","repository":{"id":1217740,"uuid":"41790845","full_name":"syntax-tree/unist-util-find-before","owner":"syntax-tree","description":"utility to find a node before another 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unist-util-find-before\n\n[![Build][build-badge]][build]\n[![Coverage][coverage-badge]][coverage]\n[![Downloads][downloads-badge]][downloads]\n[![Size][size-badge]][size]\n[![Sponsors][sponsors-badge]][collective]\n[![Backers][backers-badge]][collective]\n[![Chat][chat-badge]][chat]\n\n[unist][] utility to find a node before another node.\n\n## Contents\n\n* [What is this?](#what-is-this)\n* [When should I use this?](#when-should-i-use-this)\n* [Install](#install)\n* [Use](#use)\n* [API](#api)\n  * [`findBefore(parent, node|index[, test])`](#findbeforeparent-nodeindex-test)\n* [Types](#types)\n* [Compatibility](#compatibility)\n* [Related](#related)\n* [Contribute](#contribute)\n* [License](#license)\n\n## What is this?\n\nThis is a tiny utility that you can use to find a node before another node or\nbefore an index in a parent.\n\n## When should I use this?\n\nThis is super tiny.\nYou can of course do it yourself.\nBut this helps when integrating with the rest of unified and unist.\n\n## Install\n\nThis package is [ESM only][esm].\nIn Node.js (version 16+), install with [npm][]:\n\n```sh\nnpm install unist-util-find-before\n```\n\nIn Deno with [`esm.sh`][esmsh]:\n\n```js\nimport {findBefore} from 'https://esm.sh/unist-util-find-before@4'\n```\n\nIn browsers with [`esm.sh`][esmsh]:\n\n```html\n\u003cscript type=\"module\"\u003e\n  import {findBefore} from 'https://esm.sh/unist-util-find-before@4?bundle'\n\u003c/script\u003e\n```\n\n## Use\n\n```js\nimport {u} from 'unist-builder'\nimport {findBefore} from 'unist-util-find-before'\n\nconst tree = u('tree', [\n  u('leaf', 'leaf 1'),\n  u('parent', [u('leaf', 'leaf 2'), u('leaf', 'leaf 3')]),\n  u('leaf', 'leaf 4'),\n  u('parent', [u('leaf', 'leaf 5')]),\n  u('leaf', 'leaf 6'),\n  u('empty'),\n  u('leaf', 'leaf 7')\n])\n\nconst empty = tree.children[5]\n\nconsole.log(findBefore(tree, empty, 'parent'))\n```\n\nYields:\n\n```js\n{type: 'parent', children: [{type: 'leaf', value: 'leaf 5'}]}\n```\n\n## API\n\nThis package exports the identifier [`findBefore`][api-findbefore].\nThere is no default export.\n\n### `findBefore(parent, node|index[, test])`\n\nFind the first node in `parent` before another `node` or before an index,\nthat passes `test`.\n\n###### Parameters\n\n* `parent` ([`Node`][node])\n  — parent node\n* `index` (`number`)\n  — index of child in `parent`\n* `child` ([`Node`][node])\n  — child in `parent`\n* `test` ([`Test`][test])\n  — `unist-util-is`-compatible test\n\n###### Returns\n\nChild of `parent` ([`Node`][node]) or `undefined`.\n\n## Types\n\nThis package is fully typed with [TypeScript][].\nIt exports no additional types (types for the test are in `unist-util-is`).\n\n## Compatibility\n\nProjects maintained by the unified collective are compatible with maintained\nversions of Node.js.\n\nWhen we cut a new major release, we drop support for unmaintained versions of\nNode.\nThis means we try to keep the current release line, `unist-util-find-before@^4`,\ncompatible with Node.js 16.\n\n## Related\n\n* [`unist-util-find-after`](https://github.com/syntax-tree/unist-util-find-after)\n  — find a node after another node\n* [`unist-util-find-all-after`](https://github.com/syntax-tree/unist-util-find-all-after)\n  — find all nodes after another node\n* [`unist-util-find-all-before`](https://github.com/syntax-tree/unist-util-find-all-before)\n  — find all nodes before another node\n* [`unist-util-find-all-between`](https://github.com/mrzmmr/unist-util-find-all-between)\n  — find all nodes between two nodes\n* [`unist-util-visit`](https://github.com/syntax-tree/unist-util-visit)\n  — walk the tree\n* [`unist-util-visit-parents`](https://github.com/syntax-tree/unist-util-visit-parents)\n  — walk the tree with a stack of parents\n* [`unist-util-filter`](https://github.com/syntax-tree/unist-util-filter)\n  — create a new tree with all nodes that pass a test\n* [`unist-util-map`](https://github.com/syntax-tree/unist-util-map)\n  — create a new tree with all nodes mapped by a given function\n* [`unist-util-flatmap`](https://gitlab.com/staltz/unist-util-flatmap)\n  — create a new tree by mapping (to an array) by a given function\n* [`unist-util-remove`](https://github.com/syntax-tree/unist-util-remove)\n  — remove nodes from a tree that pass a test\n* [`unist-util-select`](https://github.com/syntax-tree/unist-util-select)\n  — select nodes with CSS-like selectors\n\n## Contribute\n\nSee [`contributing.md`][contributing] in [`syntax-tree/.github`][health] for\nways to get started.\nSee [`support.md`][support] for ways to get help.\n\nThis project has a [Code of Conduct][coc].\nBy interacting with this repository, organisation, or community you agree to\nabide by its terms.\n\n## License\n\n[MIT][license] © [Titus Wormer][author]\n\n\u003c!-- Definitions --\u003e\n\n[build-badge]: https://github.com/syntax-tree/unist-util-find-before/workflows/main/badge.svg\n\n[build]: https://github.com/syntax-tree/unist-util-find-before/actions\n\n[coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/unist-util-find-before.svg\n\n[coverage]: https://codecov.io/github/syntax-tree/unist-util-find-before\n\n[downloads-badge]: https://img.shields.io/npm/dm/unist-util-find-before.svg\n\n[downloads]: https://www.npmjs.com/package/unist-util-find-before\n\n[size-badge]: https://img.shields.io/badge/dynamic/json?label=minzipped%20size\u0026query=$.size.compressedSize\u0026url=https://deno.bundlejs.com/?q=unist-util-find-before\n\n[size]: https://bundlejs.com/?q=unist-util-find-before\n\n[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg\n\n[backers-badge]: https://opencollective.com/unified/backers/badge.svg\n\n[collective]: https://opencollective.com/unified\n\n[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg\n\n[chat]: https://github.com/syntax-tree/unist/discussions\n\n[npm]: https://docs.npmjs.com/cli/install\n\n[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c\n\n[esmsh]: https://esm.sh\n\n[typescript]: https://www.typescriptlang.org\n\n[license]: license\n\n[author]: https://wooorm.com\n\n[health]: https://github.com/syntax-tree/.github\n\n[contributing]: https://github.com/syntax-tree/.github/blob/main/contributing.md\n\n[support]: https://github.com/syntax-tree/.github/blob/main/support.md\n\n[coc]: https://github.com/syntax-tree/.github/blob/main/code-of-conduct.md\n\n[unist]: https://github.com/syntax-tree/unist\n\n[node]: https://github.com/syntax-tree/unist#node\n\n[test]: https://github.com/syntax-tree/unist-util-is#test\n\n[api-findbefore]: 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