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https://github.com/syntax-tree/mdast-util-mdx
mdast extension to parse and serialize MDX (or MDX.js)
https://github.com/syntax-tree/mdast-util-mdx
esm expression jsx markdown md mdast mdast-util mdx mdxjs
Last synced: 24 days ago
JSON representation
mdast extension to parse and serialize MDX (or MDX.js)
- Host: GitHub
- URL: https://github.com/syntax-tree/mdast-util-mdx
- Owner: syntax-tree
- License: mit
- Created: 2020-12-08T20:45:34.000Z (almost 4 years ago)
- Default Branch: main
- Last Pushed: 2024-02-10T09:25:36.000Z (9 months ago)
- Last Synced: 2024-09-30T00:43:44.512Z (about 1 month ago)
- Topics: esm, expression, jsx, markdown, md, mdast, mdast-util, mdx, mdxjs
- Language: JavaScript
- Homepage: https://unifiedjs.com
- Size: 108 KB
- Stars: 19
- Watchers: 8
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: readme.md
- License: license
Awesome Lists containing this project
README
# mdast-util-mdx
[![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]
[mdast][] extensions to parse and serialize [MDX][]: ESM, JSX, and expressions.
## Contents
* [What is this?](#what-is-this)
* [When to use this](#when-to-use-this)
* [Install](#install)
* [Use](#use)
* [API](#api)
* [`mdxFromMarkdown()`](#mdxfrommarkdown)
* [`mdxToMarkdown(options?)`](#mdxtomarkdownoptions)
* [`ToMarkdownOptions`](#tomarkdownoptions)
* [HTML](#html)
* [Syntax](#syntax)
* [Syntax tree](#syntax-tree)
* [Types](#types)
* [Compatibility](#compatibility)
* [Related](#related)
* [Contribute](#contribute)
* [License](#license)
## What is this?
This package contains two extensions that add support for MDX syntax in
markdown to [mdast][]: ESM (`import x from 'y'`), JSX (``), and
expressions (`{Math.PI}`).
These extensions plug into
[`mdast-util-from-markdown`][mdast-util-from-markdown] (to support parsing
MDX in markdown into a syntax tree) and
[`mdast-util-to-markdown`][mdast-util-to-markdown] (to support serializing
MDX in syntax trees to markdown).
## When to use this
You can use these extensions when you are working with
`mdast-util-from-markdown` and `mdast-util-to-markdown` already.
When working with `mdast-util-from-markdown`, you must combine this package
with [`micromark-extension-mdx`][mdx] or [`micromark-extension-mdxjs`][mdxjs].
Instead of this package, you can also use the extensions separately:
* [`mdast-util-mdx-expression`](https://github.com/syntax-tree/mdast-util-mdx-expression)
— support MDX expressions
* [`mdast-util-mdx-jsx`](https://github.com/syntax-tree/mdast-util-mdx-jsx)
— support MDX JSX
* [`mdast-util-mdxjs-esm`](https://github.com/syntax-tree/mdast-util-mdxjs-esm)
— support MDX ESM
All these packages are used in [`remark-mdx`][remark-mdx], which
focusses on making it easier to transform content by abstracting these
internals away.
## Install
This package is [ESM only][esm].
In Node.js (version 16+), install with [npm][]:
```sh
npm install mdast-util-mdx
```
In Deno with [`esm.sh`][esmsh]:
```js
import {mdxFromMarkdown, mdxToMarkdown} from 'https://esm.sh/mdast-util-mdx@3'
```
In browsers with [`esm.sh`][esmsh]:
```html
import {mdxFromMarkdown, mdxToMarkdown} from 'https://esm.sh/mdast-util-mdx@3?bundle'
```
## Use
Say our document `example.mdx` contains:
```mdx
import Box from "place"
Here’s an expression:
{
1 + 1 /* } */
}
Which you can also put inline: {1+1}.
- Lists, which can be indented.
```
…and our module `example.js` looks as follows:
```js
import fs from 'node:fs/promises'
import {mdxjs} from 'micromark-extension-mdxjs'
import {fromMarkdown} from 'mdast-util-from-markdown'
import {mdxFromMarkdown, mdxToMarkdown} from 'mdast-util-mdx'
import {toMarkdown} from 'mdast-util-to-markdown'
const doc = await fs.readFile('example.mdx')
const tree = fromMarkdown(doc, {
extensions: [mdxjs()],
mdastExtensions: [mdxFromMarkdown()]
})
console.log(tree)
const out = toMarkdown(tree, {extensions: [mdxToMarkdown()]})
console.log(out)
```
…now running `node example.js` yields (positional info removed for brevity):
```js
{
type: 'root',
children: [
{
type: 'mdxjsEsm',
value: 'import Box from "place"',
data: {
estree: {
type: 'Program',
body: [
{
type: 'ImportDeclaration',
specifiers: [
{
type: 'ImportDefaultSpecifier',
local: {type: 'Identifier', name: 'Box'}
}
],
source: {type: 'Literal', value: 'place', raw: '"place"'}
}
],
sourceType: 'module'
}
}
},
{
type: 'paragraph',
children: [{type: 'text', value: 'Here’s an expression:'}]
},
{
type: 'mdxFlowExpression',
value: '\n1 + 1 /* } */\n',
data: {
estree: {
type: 'Program',
body: [
{
type: 'ExpressionStatement',
expression: {
type: 'BinaryExpression',
left: {type: 'Literal', value: 1, raw: '1'},
operator: '+',
right: {type: 'Literal', value: 1, raw: '1'}
}
}
],
sourceType: 'module'
}
}
},
{
type: 'paragraph',
children: [
{type: 'text', value: 'Which you can also put inline: '},
{
type: 'mdxTextExpression',
value: '1+1',
data: {
estree: {
type: 'Program',
body: [
{
type: 'ExpressionStatement',
expression: {
type: 'BinaryExpression',
left: {type: 'Literal', value: 1, raw: '1'},
operator: '+',
right: {type: 'Literal', value: 1, raw: '1'}
}
}
],
sourceType: 'module'
}
}
},
{type: 'text', value: '.'}
]
},
{
type: 'mdxJsxFlowElement',
name: 'Box',
attributes: [],
children: [
{
type: 'mdxJsxFlowElement',
name: 'SmallerBox',
attributes: [],
children: [
{
type: 'list',
ordered: false,
start: null,
spread: false,
children: [
{
type: 'listItem',
spread: false,
checked: null,
children: [
{
type: 'paragraph',
children: [
{type: 'text', value: 'Lists, which can be indented.'}
]
}
]
}
]
}
]
}
]
}
]
}
```
```mdx
import Box from "place"
Here’s an expression:
{
1 + 1 /* } */
}
Which you can also put inline: {1+1}.
* Lists, which can be indented.
```
## API
This package exports the identifiers [`mdxFromMarkdown`][api-mdx-from-markdown]
and [`mdxToMarkdown`][api-mdx-to-markdown].
There is no default export.
### `mdxFromMarkdown()`
Create an extension for [`mdast-util-from-markdown`][mdast-util-from-markdown]
to enable MDX (ESM, JSX, expressions).
###### Returns
Extension for `mdast-util-from-markdown` to enable MDX
([`FromMarkdownExtension`][from-markdown-extension]).
When using the [syntax extensions with `addResult`][mdxjs], ESM and expression
nodes will have `data.estree` fields set to ESTree [`Program`][program] node.
### `mdxToMarkdown(options?)`
Create an extension for [`mdast-util-to-markdown`][mdast-util-to-markdown]
to enable MDX (ESM, JSX, expressions).
Extension for [`mdast-util-to-markdown`][mdast-util-to-markdown].
###### Parameters
* `options` ([`ToMarkdownOptions`][api-to-markdown-options])
— configuration
###### Returns
Extension for `mdast-util-to-markdown` to enable MDX
([`FromMarkdownExtension`][to-markdown-extension]).
### `ToMarkdownOptions`
Configuration (TypeScript type).
###### Fields
* `quote` (`'"'` or `"'"`, default: `'"'`)
— preferred quote to use around attribute values
* `quoteSmart` (`boolean`, default: `false`)
— use the other quote if that results in less bytes
* `tightSelfClosing` (`boolean`, default: `false`)
— do not use an extra space when closing self-closing elements: `![]()
`
instead of `![]()
`
* `printWidth` (`number`, default: `Infinity`)
— try and wrap syntax at this width.
When set to a finite number (say, `80`), the formatter will print
attributes on separate lines when a tag doesn’t fit on one line.
The normal behavior is to print attributes with spaces between them instead
of line endings
## HTML
MDX has no representation in HTML.
Though, when you are dealing with MDX, you will likely go *through* hast.
You can enable passing MDX through to hast by configuring
[`mdast-util-to-hast`][mdast-util-to-hast] with `passThrough: ['mdxjsEsm',
'mdxFlowExpression', 'mdxJsxFlowElement', 'mdxJsxTextElement', 'mdxTextExpression']`.
## Syntax
See [Syntax in `micromark-extension-mdxjs`][mdxjs].
## Syntax tree
This utility combines several mdast utilities.
See their readmes for the node types supported in the tree:
* [`mdast-util-mdx-expression`](https://github.com/syntax-tree/mdast-util-mdx-expression#syntax-tree)
— support MDX expressions
* [`mdast-util-mdx-jsx`](https://github.com/syntax-tree/mdast-util-mdx-jsx#syntax-tree)
— support MDX JSX
* [`mdast-util-mdxjs-esm`](https://github.com/syntax-tree/mdast-util-mdxjs-esm#syntax-tree)
— support MDX ESM
## Types
This package is fully typed with [TypeScript][].
It exports the additional types
`MdxFlowExpression` and `MdxTextExpression`
from `mdast-util-mdx-expression`;
`MdxJsxAttribute`,
`MdxJsxAttributeValueExpression`,
`MdxJsxExpressionAttribute`,
`MdxJsxFlowElement`,
`MdxJsxTextElement`,
and [`ToMarkdownOptions`][api-to-markdown-options]
from `mdast-util-mdx-jsx`;
and `MdxjsEsm` from `mdast-util-mdxjs-esm`.
It also registers the node types with `@types/mdast` and `@types/hast`.
If you’re working with the syntax tree, make sure to import this utility
somewhere in your types, as that registers the new node types in the tree.
```js
/**
* @typedef {import('mdast-util-mdx')}
*/
import {visit} from 'unist-util-visit'
/** @type {import('mdast').Root} */
const tree = getMdastNodeSomeHow()
visit(tree, function (node) {
// `node` can now be an expression, JSX, or ESM node.
})
```
## 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, `mdast-util-mdx@^3`,
compatible with Node.js 16.
This utility works with `mdast-util-from-markdown` version 2+ and
`mdast-util-to-markdown` version 2+.
## Related
* [`remark-mdx`][remark-mdx]
— remark plugin to support MDX
* [`micromark-extension-mdx`][mdx]
— micromark extension to parse MDX
* [`micromark-extension-mdxjs`][mdxjs]
— micromark extension to parse JavaScript-aware MDX
## 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] © [Titus Wormer][author]
[build-badge]: https://github.com/syntax-tree/mdast-util-mdx/workflows/main/badge.svg
[build]: https://github.com/syntax-tree/mdast-util-mdx/actions
[coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/mdast-util-mdx.svg
[coverage]: https://codecov.io/github/syntax-tree/mdast-util-mdx
[downloads-badge]: https://img.shields.io/npm/dm/mdast-util-mdx.svg
[downloads]: https://www.npmjs.com/package/mdast-util-mdx
[size-badge]: https://img.shields.io/badge/dynamic/json?label=minzipped%20size&query=$.size.compressedSize&url=https://deno.bundlejs.com/?q=mdast-util-mdx
[size]: https://bundlejs.com/?q=mdast-util-mdx
[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
[mdast]: https://github.com/syntax-tree/mdast
[mdast-util-from-markdown]: https://github.com/syntax-tree/mdast-util-from-markdown
[from-markdown-extension]: https://github.com/syntax-tree/mdast-util-from-markdown#extension
[mdast-util-to-markdown]: https://github.com/syntax-tree/mdast-util-to-markdown
[to-markdown-extension]: https://github.com/syntax-tree/mdast-util-to-markdown#options
[mdast-util-to-hast]: https://github.com/syntax-tree/mdast-util-to-hast
[mdx]: https://github.com/micromark/micromark-extension-mdx
[mdxjs]: https://github.com/micromark/micromark-extension-mdxjs
[remark-mdx]: https://github.com/mdx-js/mdx/tree/next/packages/remark-mdx
[program]: https://github.com/estree/estree/blob/master/es2015.md#programs
[api-mdx-from-markdown]: #mdxfrommarkdown
[api-mdx-to-markdown]: #mdxtomarkdownoptions
[api-to-markdown-options]: #tomarkdownoptions