37 lines
942 B
JavaScript
37 lines
942 B
JavaScript
/**
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* @typedef {import('mdast').Root} Root
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* @typedef {import('micromark-extension-frontmatter').Options} Options
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*/
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import {frontmatter} from 'micromark-extension-frontmatter'
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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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/**
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* Plugin to add support for frontmatter.
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*
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* @type {import('unified').Plugin<[Options?]|void[], Root>}
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*/
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export default function remarkFrontmatter(options = 'yaml') {
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const data = this.data()
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add('micromarkExtensions', frontmatter(options))
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add('fromMarkdownExtensions', frontmatterFromMarkdown(options))
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add('toMarkdownExtensions', frontmatterToMarkdown(options))
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/**
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* @param {string} field
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* @param {unknown} value
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*/
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function add(field, value) {
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const list = /** @type {unknown[]} */ (
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// Other extensions
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/* c8 ignore next 2 */
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data[field] ? data[field] : (data[field] = [])
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)
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list.push(value)
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}
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}
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