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https://github.com/syntax-tree/unist-builder

utility to create a new trees with a nice syntax
https://github.com/syntax-tree/unist-builder

hyperscript syntax-tree unist unist-util util

Last synced: 8 days ago
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utility to create a new trees with a nice syntax

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README 

        
# unist-builder



[![Build][build-badge]][build]

[![Coverage][coverage-badge]][coverage]

[![Downloads][downloads-badge]][downloads]

[![Size][size-badge]][size]

[![Sponsors][sponsors-badge]][collective]

[![Backers][backers-badge]][collective]

[![Chat][chat-badge]][chat]



[unist][] utility to create trees with ease.



## Contents



*   [What is this?](#what-is-this)

*   [When should I use this?](#when-should-i-use-this)

*   [Install](#install)

*   [Use](#use)

*   [API](#api)

    *   [`u(type[, props][, children|value])`](#utype-props-childrenvalue)

    *   [`ChildrenOrValue`](#childrenorvalue)

    *   [`Props`](#props)

*   [Types](#types)

*   [Compatibility](#compatibility)

*   [Related](#related)

*   [Contribute](#contribute)

*   [License](#license)



## What is this?



This package is a hyperscript interface (like `createElement` from React and

`h` from Vue and such) to help with creating unist trees.



## When should I use this?



You can use this utility in your project when you generate syntax trees with

code.

It helps because it replaces most of the repetition otherwise needed in a syntax

tree with function calls.



You can instead use [`hastscript`][hastscript] or [`xastscript`][xastscript]

when creating hast (HTML) or xast (XML) nodes.



## Install



This package is [ESM only][esm].

In Node.js (version 16+), install with [npm][]:



```sh

npm install unist-builder

```



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



```js

import {u} from 'https://esm.sh/unist-builder@4'

```



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



```html



  import {u} from 'https://esm.sh/unist-builder@4?bundle'



```



## Use



```js

import {u} from 'unist-builder'



const tree = u('root', [

  u('subtree', {id: 1}),

  u('subtree', {id: 2}, [

    u('node', [u('leaf', 'leaf 1'), u('leaf', 'leaf 2')]),

    u('leaf', {id: 3}, 'leaf 3'),

    u('void', {id: 4})

  ])

])



console.dir(tree, {depth: undefined})

```



…yields:



```js

{

  type: 'root',

  children: [

    {type: 'subtree', id: 1},

    {

      type: 'subtree',

      id: 2,

      children: [

        {

          type: 'node',

          children: [

            {type: 'leaf', value: 'leaf 1'},

            {type: 'leaf', value: 'leaf 2'}

          ]

        },

        {type: 'leaf', id: 3, value: 'leaf 3'},

        {type: 'void', id: 4}

      ]

    }

  ]

}

```



## API



This package exports the identifier [`u`][u].

There is no default export.



### `u(type[, props][, children|value])`



Build a node.



###### Signatures



*   `u(type[, props], children)` — create a parent ([`Parent`][parent])

*   `u(type[, props], value)` — create a literal ([`Literal`][literal])

*   `u(type[, props])` — create a void node (neither parent not literal)



###### Parameters



*   `type` (`string`)

    — node type

*   `props` (`Record`)

    — fields assigned to node

*   `children` ([`Array`][node])

    — children of node

*   `value` (`*`)

    — value of `node` (cast to string)



###### Returns



Built node ([`Node`][node]).



### `ChildrenOrValue`



List to use as `children` or value to use as `value` (TypeScript type).



###### Type



```ts

type ChildrenOrValue = Array | string

```



### `Props`



Other fields to add to the node (TypeScript type).



###### Type



```ts

export type Props = Record

```



## Types



This package is fully typed with [TypeScript][].

It exports the additional types [`ChildrenOrValue`][childrenorvalue] and

[`Props`][props].



## 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-builder@^4`,

compatible with Node.js 16.



## Related



*   [`hastscript`](https://github.com/syntax-tree/hastscript)

    — create [hast][] trees

*   [`xastscript`](https://github.com/syntax-tree/xastscript)

    — create [xast][] trees



## 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, organization, or community you agree to

abide by its terms.



## License



[MIT][license] © Eugene Sharygin



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



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



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



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



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



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



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



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



[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



[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



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



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



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



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



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



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



[u]: #utype-props-childrenvalue



[props]: #props



[childrenorvalue]: #childrenorvalue