449 lines
11 KiB
Markdown
449 lines
11 KiB
Markdown
# mdast-util-mdxjs-esm
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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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[mdast][] extensions to parse and serialize [MDX][] ESM (import/exports).
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## Contents
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* [What is this?](#what-is-this)
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* [When to use this](#when-to-use-this)
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* [Install](#install)
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* [Use](#use)
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* [API](#api)
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* [`mdxjsEsmFromMarkdown()`](#mdxjsesmfrommarkdown)
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* [`mdxjsEsmToMarkdown()`](#mdxjsesmtomarkdown)
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* [`MdxjsEsm`](#mdxjsesm)
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* [`MdxjsEsmHast`](#mdxjsesmhast)
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* [HTML](#html)
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* [Syntax](#syntax)
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* [Syntax tree](#syntax-tree)
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* [Nodes](#nodes)
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* [Content model](#content-model)
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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 package contains two extensions that add support for MDX ESM syntax in
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markdown to [mdast][].
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These extensions plug into
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[`mdast-util-from-markdown`][mdast-util-from-markdown] (to support parsing
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ESM in markdown into a syntax tree) and
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[`mdast-util-to-markdown`][mdast-util-to-markdown] (to support serializing
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ESM in syntax trees to markdown).
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## When to use this
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You can use these extensions when you are working with
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`mdast-util-from-markdown` and `mdast-util-to-markdown` already.
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When working with `mdast-util-from-markdown`, you must combine this package
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with [`micromark-extension-mdxjs-esm`][extension].
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When you are working with syntax trees and want all of MDX, use
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[`mdast-util-mdx`][mdast-util-mdx] instead.
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All these packages are used in [`remark-mdx`][remark-mdx], which
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focusses on making it easier to transform content by abstracting these
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internals away.
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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 mdast-util-mdxjs-esm
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```
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In Deno with [`esm.sh`][esmsh]:
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```js
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import {mdxjsEsmFromMarkdown, mdxjsEsmToMarkdown} from 'https://esm.sh/mdast-util-mdxjs-esm@2'
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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 {mdxjsEsmFromMarkdown, mdxjsEsmToMarkdown} from 'https://esm.sh/mdast-util-mdxjs-esm@2?bundle'
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</script>
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```
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## Use
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Say our document `example.mdx` contains:
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```mdx
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import a from 'b'
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export const c = ''
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d
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```
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…and our module `example.js` looks as follows:
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```js
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import fs from 'node:fs/promises'
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import * as acorn from 'acorn'
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import {fromMarkdown} from 'mdast-util-from-markdown'
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import {toMarkdown} from 'mdast-util-to-markdown'
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import {mdxjsEsm} from 'micromark-extension-mdxjs-esm'
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import {mdxjsEsmFromMarkdown, mdxjsEsmToMarkdown} from 'mdast-util-mdxjs-esm'
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const doc = await fs.readFile('example.mdx')
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const tree = fromMarkdown(doc, {
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extensions: [mdxjsEsm({acorn, addResult: true})],
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mdastExtensions: [mdxjsEsmFromMarkdown()]
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})
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console.log(tree)
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const out = toMarkdown(tree, {extensions: [mdxjsEsmToMarkdown()]})
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console.log(out)
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```
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…now running `node example.js` yields (positional info removed for brevity):
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```js
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{
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type: 'root',
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children: [
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{
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type: 'mdxjsEsm',
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value: "import a from 'b'\nexport const c = ''",
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data: {
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estree: {
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type: 'Program',
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body: [
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{
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type: 'ImportDeclaration',
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specifiers: [
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{
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type: 'ImportDefaultSpecifier',
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local: {type: 'Identifier', name: 'a'}
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}
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],
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source: {type: 'Literal', value: 'b', raw: "'b'"}
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},
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{
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type: 'ExportNamedDeclaration',
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declaration: {
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type: 'VariableDeclaration',
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declarations: [
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{
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type: 'VariableDeclarator',
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id: {type: 'Identifier', name: 'c'},
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init: {type: 'Literal', value: '', raw: "''"}
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}
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],
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kind: 'const'
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},
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specifiers: [],
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source: null
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}
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],
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sourceType: 'module'
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}
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}
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},
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{type: 'paragraph', children: [{type: 'text', value: 'd'}]}
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]
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}
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```
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```markdown
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import a from 'b'
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export const c = ''
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d
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```
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## API
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This package exports the identifiers
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[`mdxjsEsmFromMarkdown`][api-mdxjs-esm-from-markdown] and
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[`mdxjsEsmToMarkdown`][api-mdxjs-esm-to-markdown].
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There is no default export.
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### `mdxjsEsmFromMarkdown()`
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Create an extension for [`mdast-util-from-markdown`][mdast-util-from-markdown]
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to enable MDX.js ESM in markdown.
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When using the [micromark syntax extension][extension] with `addResult`, nodes
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will have a `data.estree` field set to an ESTree [`Program`][program] node.
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###### Returns
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Extension for `mdast-util-from-markdown` to enable MDX.js ESM
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([`FromMarkdownExtension`][from-markdown-extension]).
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### `mdxjsEsmToMarkdown()`
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Create an extension for [`mdast-util-to-markdown`][mdast-util-to-markdown]
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to enable MDX.js ESM in markdown.
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###### Returns
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Extension for `mdast-util-to-markdown` to enable MDX.js ESM
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([`ToMarkdownExtension`][to-markdown-extension]).
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### `MdxjsEsm`
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MDX ESM (import/export) node (TypeScript type).
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###### Type
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```ts
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import type {Program} from 'estree-jsx'
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import type {Data, Literal} from 'mdast'
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interface MdxjsEsm extends Literal {
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type: 'mdxjsEsm'
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data?: MdxjsEsmData | undefined
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}
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export interface MdxjsEsmData extends Data {
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estree?: Program | null | undefined
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}
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```
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### `MdxjsEsmHast`
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Same as [`MdxjsEsm`][api-mdxjs-esm], but registered with `@types/hast`
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(TypeScript type).
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###### Type
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```ts
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import type {Program} from 'estree-jsx'
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import type {Data, Literal} from 'hast'
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interface MdxjsEsmHast extends Literal {
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type: 'mdxjsEsm'
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data?: MdxjsEsmHastData | undefined
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}
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export interface MdxjsEsmHastData extends Data {
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estree?: Program | null | undefined
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}
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```
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## HTML
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MDX ESM has no representation in HTML.
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Though, when you are dealing with MDX, you will likely go *through* hast.
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You can enable passing MDX ESM through to hast by configuring
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[`mdast-util-to-hast`][mdast-util-to-hast] with `passThrough: ['mdxjsEsm']`.
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## Syntax
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See [Syntax in `micromark-extension-mdxjs-esm`][syntax].
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## Syntax tree
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The following interfaces are added to **[mdast][]** by this utility.
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### Nodes
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#### `MdxjsEsm`
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```idl
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interface MdxjsEsm <: Literal {
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type: 'mdxjsEsm'
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}
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```
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**MdxjsEsm** (**[Literal][dfn-literal]**) represents ESM import/exports
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embedded in MDX.
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It can be used where **[flow][dfn-flow-content]** content is expected.
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Its content is represented by its `value` field.
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For example, the following Markdown:
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```markdown
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import a from 'b'
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```
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Yields:
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```js
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{
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type: 'mdxjsEsm',
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value: 'import a from \'b\''
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}
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```
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### Content model
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#### `FlowContent` (MDX.js ESM)
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```idl
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type FlowContentMdxjsEsm = MdxjsEsm | FlowContent
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```
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Note that when ESM is present, it can only exist as top-level content: if it has
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a *[parent][dfn-parent]*, that parent must be **[Root][dfn-root]**.
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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 [`MdxjsEsm`][api-mdxjs-esm] and
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[`MdxjsEsmHast`][api-mdxjs-esm-hast].
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It also registers the node type with `@types/mdast` and `@types/hast`.
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If you’re working with the syntax tree, make sure to import this utility
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somewhere in your types, as that registers the new node types in the tree.
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```js
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/**
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* @typedef {import('mdast-util-mdxjs-esm')}
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*/
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import {visit} from 'unist-util-visit'
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/** @type {import('mdast').Root} */
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const tree = getMdastNodeSomeHow()
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visit(tree, function (node) {
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// `node` can now be an ESM node.
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})
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```
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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, `mdast-util-mdxjs-esm@^2`,
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compatible with Node.js 16.
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This utility works with `mdast-util-from-markdown` version 2+ and
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`mdast-util-to-markdown` version 2+.
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## Related
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* [`remarkjs/remark-mdx`][remark-mdx]
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— remark plugin to support MDX
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* [`syntax-tree/mdast-util-mdx`][mdast-util-mdx]
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— mdast utility to support MDX
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* [`micromark/micromark-extension-mdxjs-esm`][extension]
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— micromark extension to parse MDX.js ESM
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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, organization, 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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<!-- Definitions -->
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[build-badge]: https://github.com/syntax-tree/mdast-util-mdxjs-esm/workflows/main/badge.svg
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[build]: https://github.com/syntax-tree/mdast-util-mdxjs-esm/actions
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[coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/mdast-util-mdxjs-esm.svg
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[coverage]: https://codecov.io/github/syntax-tree/mdast-util-mdxjs-esm
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[downloads-badge]: https://img.shields.io/npm/dm/mdast-util-mdxjs-esm.svg
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[downloads]: https://www.npmjs.com/package/mdast-util-mdxjs-esm
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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=mdast-util-mdxjs-esm
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[size]: https://bundlejs.com/?q=mdast-util-mdxjs-esm
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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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[mdast]: https://github.com/syntax-tree/mdast
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[mdast-util-to-hast]: https://github.com/syntax-tree/mdast-util-to-hast
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[mdast-util-from-markdown]: https://github.com/syntax-tree/mdast-util-from-markdown
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[mdast-util-to-markdown]: https://github.com/syntax-tree/mdast-util-to-markdown
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[mdast-util-mdx]: https://github.com/syntax-tree/mdast-util-mdx
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[extension]: https://github.com/micromark/micromark-extension-mdxjs-esm
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[syntax]: https://github.com/micromark/micromark-extension-mdxjs-esm#syntax
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[program]: https://github.com/estree/estree/blob/master/es2015.md#programs
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[dfn-literal]: https://github.com/syntax-tree/mdast#literal
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[dfn-parent]: https://github.com/syntax-tree/unist#parent-1
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[dfn-root]: https://github.com/syntax-tree/mdast#root
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[remark-mdx]: https://mdxjs.com/packages/remark-mdx/
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[mdx]: https://mdxjs.com
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[from-markdown-extension]: https://github.com/syntax-tree/mdast-util-from-markdown#extension
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[to-markdown-extension]: https://github.com/syntax-tree/mdast-util-to-markdown#options
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[dfn-flow-content]: #flowcontent-mdxjs-esm
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[api-mdxjs-esm-from-markdown]: #mdxjsesmfrommarkdown
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[api-mdxjs-esm-to-markdown]: #mdxjsesmtomarkdown
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[api-mdxjs-esm]: #mdxjsesm
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[api-mdxjs-esm-hast]: #mdxjsesmhast
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