264 lines
7 KiB
Markdown
264 lines
7 KiB
Markdown
# unist-util-visit-children
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[![Build][build-badge]][build]
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[![Coverage][coverage-badge]][coverage]
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[![Downloads][downloads-badge]][downloads]
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[![Size][size-badge]][size]
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[![Sponsors][sponsors-badge]][collective]
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[![Backers][backers-badge]][collective]
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[![Chat][chat-badge]][chat]
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[unist][] utility to visit direct children of a parent.
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## Contents
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* [What is this?](#what-is-this)
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* [When should I use this?](#when-should-i-use-this)
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* [Install](#install)
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* [Use](#use)
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* [API](#api)
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* [`visitChildren(visitor)`](#visitchildrenvisitor)
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* [`Visitor`](#visitor)
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* [`Visit`](#visit)
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* [Types](#types)
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* [Compatibility](#compatibility)
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* [Related](#related)
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* [Contribute](#contribute)
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* [License](#license)
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## What is this?
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This is a tiny utility that you can use to create a reusable function that
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only visits direct children.
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## When should I use this?
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Probably never!
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Use [`unist-util-visit`][unist-util-visit].
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## Install
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This package is [ESM only][esm].
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In Node.js (version 16+), install with [npm][]:
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```sh
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npm install unist-util-visit-children
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```
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In Deno with [`esm.sh`][esmsh]:
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```js
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import {visitChildren} from 'https://esm.sh/unist-util-visit-children@3'
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```
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In browsers with [`esm.sh`][esmsh]:
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```html
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<script type="module">
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import {visitChildren} from 'https://esm.sh/unist-util-visit-children@3?bundle'
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</script>
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```
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## Use
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```js
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import u from 'unist-builder'
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import {visitChildren} from 'unist-util-visit-children'
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const visit = visitChildren(function (node) {
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console.log(node)
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})
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const tree = u('tree', [
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u('leaf', 'leaf 1'),
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u('node', [u('leaf', 'leaf 2'), u('leaf', 'leaf 3')]),
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u('leaf', 'leaf 4'),
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u('void')
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])
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visit(tree)
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```
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Yields:
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```js
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{type: 'leaf', value: 'leaf 1'}
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{
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type: 'node',
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children: [
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{type: 'leaf', value: 'leaf 2'},
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{type: 'leaf', value: 'leaf 3'}
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]
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}
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{type: 'leaf', value: 'leaf 4'}
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{type: 'void'}
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```
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## API
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This package exports the identifier [`visitChildren`][api-visitchildren].
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There is no default export.
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### `visitChildren(visitor)`
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Wrap `visitor` to be called for each child in the nodes later given to `visit`.
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###### Parameters
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* `visitor` ([`Visitor`][api-visitor])
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— callback called for each `child` in `parent` later given to `visit`
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###### Returns
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Function to call the bound `visitor` for each child in `parent`
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([`Visit`][api-visit]).
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### `Visitor`
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Callback called for each `child` in `parent` later given to `visit`
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(TypeScript type).
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###### Parameters
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* `child` ([`Node`][node])
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— child of parent
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* `index` (`number`)
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— position of `child` in parent
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* `parent` ([`Node`][node])
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— parent node
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###### Returns
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Nothing (`undefined`).
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### `Visit`
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Function to call the bound `visitor` for each child in `parent`
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(TypeScript type).
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###### Parameters
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* `parent` ([`Node`][node])
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— parent node
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###### Returns
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Nothing (`undefined`).
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## Types
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This package is fully typed with [TypeScript][].
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It exports the additional types [`Visit`][api-visit] and
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[`Visitor`][api-visitor].
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## Compatibility
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Projects maintained by the unified collective are compatible with maintained
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versions of Node.js.
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When we cut a new major release, we drop support for unmaintained versions of
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Node.
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This means we try to keep the current release line,
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`unist-util-visit-children@^3`, compatible with Node.js 16.
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## Related
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* [`unist-util-visit`](https://github.com/syntax-tree/unist-util-visit)
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— walk the tree
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* [`unist-util-visit-parents`](https://github.com/syntax-tree/unist-util-visit-parents)
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— walk the tree with a stack of parents
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* [`unist-util-filter`](https://github.com/syntax-tree/unist-util-filter)
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— create a new tree with all nodes that pass a test
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* [`unist-util-map`](https://github.com/syntax-tree/unist-util-map)
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— create a new tree with all nodes mapped by a given function
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* [`unist-util-flatmap`](https://gitlab.com/staltz/unist-util-flatmap)
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— create a new tree by mapping (to an array) with the given function
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* [`unist-util-find-all-after`](https://github.com/syntax-tree/unist-util-find-all-after)
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— find nodes after another node
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* [`unist-util-find-all-before`](https://github.com/syntax-tree/unist-util-find-all-before)
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— find nodes before another node
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* [`unist-util-find-after`](https://github.com/syntax-tree/unist-util-find-after)
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— find a node after another node
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* [`unist-util-find-before`](https://github.com/syntax-tree/unist-util-find-before)
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— find a node before another node
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* [`unist-util-find-all-between`](https://github.com/mrzmmr/unist-util-find-all-between)
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— find all nodes between two nodes
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* [`unist-util-remove`](https://github.com/syntax-tree/unist-util-remove)
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— remove nodes from a tree that pass a test
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* [`unist-util-select`](https://github.com/syntax-tree/unist-util-select)
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— select nodes with CSS-like selectors
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## Contribute
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See [`contributing.md`][contributing] in [`syntax-tree/.github`][health] for
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ways to get started.
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See [`support.md`][support] for ways to get help.
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This project has a [code of conduct][coc].
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By interacting with this repository, organisation, or community you agree to
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abide by its terms.
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## License
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[MIT][license] © [Titus Wormer][author]
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<!-- Definition -->
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[build-badge]: https://github.com/syntax-tree/unist-util-visit-children/workflows/main/badge.svg
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[build]: https://github.com/syntax-tree/unist-util-visit-children/actions
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[coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/unist-util-visit-children.svg
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[coverage]: https://codecov.io/github/syntax-tree/unist-util-visit-children
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[downloads-badge]: https://img.shields.io/npm/dm/unist-util-visit-children.svg
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[downloads]: https://www.npmjs.com/package/unist-util-visit-children
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[size-badge]: https://img.shields.io/badge/dynamic/json?label=minzipped%20size&query=$.size.compressedSize&url=https://deno.bundlejs.com/?q=unist-util-visit-children
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[size]: https://bundlejs.com/?q=unist-util-visit-children
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[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg
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[backers-badge]: https://opencollective.com/unified/backers/badge.svg
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[collective]: https://opencollective.com/unified
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[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg
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[chat]: https://github.com/syntax-tree/unist/discussions
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[npm]: https://docs.npmjs.com/cli/install
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[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
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[esmsh]: https://esm.sh
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[typescript]: https://www.typescriptlang.org
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[license]: license
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[author]: https://wooorm.com
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[health]: https://github.com/syntax-tree/.github
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[contributing]: https://github.com/syntax-tree/.github/blob/main/contributing.md
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[support]: https://github.com/syntax-tree/.github/blob/main/support.md
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[coc]: https://github.com/syntax-tree/.github/blob/main/code-of-conduct.md
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[unist]: https://github.com/syntax-tree/unist
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[node]: https://github.com/syntax-tree/unist#nodes
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[unist-util-visit]: https://github.com/syntax-tree/unist-util-visit
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[api-visitchildren]: #visitchildrenvisitor
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[api-visit]: #visit
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[api-visitor]: #visitor
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