49 lines
1.5 KiB
JavaScript
49 lines
1.5 KiB
JavaScript
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/// <reference types="remark-parse" />
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/// <reference types="remark-stringify" />
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/**
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* @typedef {import('mdast').Root} Root
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* @typedef {import('micromark-extension-frontmatter').Options} Options
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* @typedef {import('unified').Processor<Root>} Processor
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*/
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import {
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frontmatterFromMarkdown,
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frontmatterToMarkdown
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} from 'mdast-util-frontmatter'
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import {frontmatter} from 'micromark-extension-frontmatter'
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/** @type {Options} */
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const emptyOptions = 'yaml'
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/**
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* Add support for frontmatter.
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*
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* ###### Notes
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*
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* Doesn’t parse the data inside them: create your own plugin to do that.
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*
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* @param {Options | null | undefined} [options='yaml']
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* Configuration (default: `'yaml'`).
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* @returns {undefined}
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* Nothing.
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*/
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export default function remarkFrontmatter(options) {
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// @ts-expect-error: TS is wrong about `this`.
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// eslint-disable-next-line unicorn/no-this-assignment
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const self = /** @type {Processor} */ (this)
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const settings = options || emptyOptions
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const data = self.data()
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const micromarkExtensions =
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data.micromarkExtensions || (data.micromarkExtensions = [])
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const fromMarkdownExtensions =
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data.fromMarkdownExtensions || (data.fromMarkdownExtensions = [])
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const toMarkdownExtensions =
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data.toMarkdownExtensions || (data.toMarkdownExtensions = [])
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micromarkExtensions.push(frontmatter(settings))
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fromMarkdownExtensions.push(frontmatterFromMarkdown(settings))
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toMarkdownExtensions.push(frontmatterToMarkdown(settings))
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}
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