unist-util-size

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[![Coverage][coverage-badge]][coverage]
[![Downloads][downloads-badge]][downloads]
[![Size][size-badge]][size]
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[![Backers][backers-badge]][collective]
[![Chat][chat-badge]][chat]

[unist][] utility to calculate the number of nodes in a tree.

Contents

* What is this?
* When should I use this?
* Install
* Use
* API
* [size(tree[, test])](#sizetree-test)
* Types
* Compatibility
* Related
* Contribute
* License

What is this?

This is a tiny utility that you can use to count nodes (that pass a test) in a
tree.

When should I use this?

This is super tiny but a sometimes common problem.
You can use [unist-util-visit][unist-util-visit] yourself as well.

Install

This package is [ESM only][esm].
In Node.js (version 16+), install with [npm][]:

``sh
npm install unist-util-size
`

In Deno with [esm.sh][esmsh]:

`js
import {size} from 'https://esm.sh/unist-util-size@4'
`

In browsers with [esm.sh][esmsh]:

`html

`

Use

`js
import {h} from 'hastscript'
import {size} from 'unist-util-size'

const tree = h('div', [
h('p', [
'Some ',
h('strong', 'importance'),
' and ',
h('em', 'emphasis'),
'.'
]),
h('pre', h('code', 'bar()'))
])

console.log(size(tree)) // => 11
console.log(size(tree, 'element')) // => 5
`

API

This package exports the identifier [size][api-size].
There is no default export.

$3

Calculate the number of nodes in tree.

###### Parameters

* tree ([Node][node])
— tree to traverse
* test ([Test][test], optional)
— unist-util-is compatible test (such as a node type)

###### Returns

Number of exclusive descendants of tree that pass test (number).

Types

This package is fully typed with [TypeScript][].
It exports no additional types.

Compatibility

Projects maintained by the unified collective are compatible with maintained
versions of Node.js.

When we cut a new major release, we drop support for unmaintained versions of
Node.
This means we try to keep the current release line, unist-util-size@^4,
compatible with Node.js 16.

Related

* unist-util-source
— get the source of a node or position

Contribute

See [contributing.md][contributing] in [syntax-tree/.github][health] for
ways to get started.
See [support.md`][support] for ways to get help.

This project has a [code of conduct][coc].
By interacting with this repository, organisation, or community you agree to
abide by its terms.

License

[MIT][license] © [Titus Wormer][author]

[build-badge]: https://github.com/syntax-tree/unist-util-size/workflows/main/badge.svg

[build]: https://github.com/syntax-tree/unist-util-size/actions

[coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/unist-util-size.svg

[coverage]: https://codecov.io/github/syntax-tree/unist-util-size

[downloads-badge]: https://img.shields.io/npm/dm/unist-util-size.svg

[downloads]: https://www.npmjs.com/package/unist-util-size

[size-badge]: https://img.shields.io/badge/dynamic/json?label=minzipped%20size&query=$.size.compressedSize&url=https://deno.bundlejs.com/?q=unist-util-size

[size]: https://bundlejs.com/?q=unist-util-size

[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg

[backers-badge]: https://opencollective.com/unified/backers/badge.svg

[collective]: https://opencollective.com/unified

[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg

[chat]: https://github.com/syntax-tree/unist/discussions

[npm]: https://docs.npmjs.com/cli/install

[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c

[esmsh]: https://esm.sh

[typescript]: https://www.typescriptlang.org

[license]: license

[author]: https://wooorm.com

[health]: https://github.com/syntax-tree/.github

[contributing]: https://github.com/syntax-tree/.github/blob/main/contributing.md

[support]: https://github.com/syntax-tree/.github/blob/main/support.md

[coc]: https://github.com/syntax-tree/.github/blob/main/code-of-conduct.md

[unist]: https://github.com/syntax-tree/unist

[node]: https://github.com/syntax-tree/unist#node

[unist-util-visit]: https://github.com/syntax-tree/unist-util-visit

[test]: https://github.com/syntax-tree/unist-util-is#test

[api-size]: #sizetree-test