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Proof of concept remark plugin for `.mdx` proposal https://spectrum.chat/thread/1021be59-2738-4511-aceb-c66921050b9a
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const React = require('react') | |
const visit = require('unist-util-visit') | |
const toHAST = require('mdast-util-to-hast') | |
const toH = require('hast-to-hyperscript') | |
const babel = require('babel-core') | |
const frontmatter = require('remark-frontmatter') | |
const yaml = require('js-yaml') | |
const util = require('util') | |
const parse = raw => babel.transform(raw, { | |
plugins: [ | |
[ | |
require('babel-plugin-transform-es2015-modules-commonjs'), | |
{ | |
strict: false, | |
loose: true | |
} | |
], | |
require('babel-plugin-transform-react-jsx') | |
] | |
}).code | |
const wrap = str => `<React.Fragment>${str.trim()}</React.Fragment>` | |
const toElement = (jsx = '', scope = {}) => { | |
const code = parse(wrap(jsx)) | |
const keys = Object.keys(scope) | |
const values = keys.map(k => scope[k]) | |
const fn = new Function('React', ...keys, `return ${code}`) | |
const el = fn(React, ...values) | |
return el | |
} | |
const mdx = function (opts) { | |
const pageScope = { | |
props: {}, | |
} | |
let importCode = '' | |
this.use(frontmatter) | |
this.Compiler = ast => { | |
// visit(ast, node => { console.log('Node', node) }) | |
visit(ast, 'yaml', yamlVisitor) | |
visit(ast, 'html', htmlVisitor) | |
const hast = { | |
type: 'element', | |
tagName: 'React.Fragment', | |
properties: {}, | |
children: toHAST(ast, { | |
allowDangerousHTML: true, | |
handlers: { | |
html: (h, node) => { | |
if (Array.isArray(node.element.props.children)) { | |
const children = node.element.props.children.map(child => { | |
const type = pageScope[child.type] || child.type | |
return h(node, type, child.props, child.props.children) | |
}) | |
const n = h(node, 'div', null, children) | |
return n | |
} | |
const { props } = node.element | |
const type = pageScope[node.element.type] || node.element.type | |
return h(node, type, props) | |
} | |
} | |
}).children | |
} | |
return toH(React.createElement, hast) | |
} | |
const yamlVisitor = node => { | |
const data = yaml.safeLoad(node.value) | |
pageScope.props = data | |
/* | |
if (data.imports) { | |
importCode += data.imports.join('\n') | |
} | |
*/ | |
if (data.modules) { | |
Object.keys(data.modules).forEach(key => { | |
const req = require(data.modules[key]) | |
const mod = req.default || req | |
pageScope[key] = req.default || req | |
// spread multiple exports | |
if (typeof mod === 'object') { | |
Object.keys(mod).forEach(key => { | |
pageScope[key] = mod[key] | |
}) | |
} | |
}) | |
} | |
} | |
const htmlVisitor = (node) => { | |
const scope = Object.assign({}, opts.components, pageScope) | |
node.element = toElement(node.value, scope) | |
} | |
} | |
module.exports = mdx |
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