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Cache MDX compiler in the Webpack loader #1468

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Apr 8, 2021
Merged

Cache MDX compiler in the Webpack loader #1468

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28 changes: 20 additions & 8 deletions packages/loader/index.js
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Original file line number Diff line number Diff line change
@@ -1,27 +1,39 @@
const {getOptions} = require('loader-utils')
const mdx = require('@mdx-js/mdx')
const {createCompiler} = require('@mdx-js/mdx')

const DEFAULT_RENDERER = `
import React from 'react'
import {mdx} from '@mdx-js/react'
`

const pragma = `
/* @jsxRuntime classic */
/* @jsx mdx */
/* @jsxFrag mdx.Fragment */
`
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const compilerCache = new Map()
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module.exports = async function (content) {
if (!compilerCache.has(this.query)) {
const {renderer = DEFAULT_RENDERER, ...opts} = getOptions(this)
compilerCache.set(this.query, [renderer, createCompiler(opts)])
}

const callback = this.async()
const options = Object.assign({}, getOptions(this), {
filepath: this.resourcePath
})
const [renderer, compiler] = compilerCache.get(this.query)

let result

try {
result = await mdx(content, options)
result = await compiler.process({
contents: content,
path: this.resourcePath
})
} catch (err) {
return callback(err)
}

const {renderer = DEFAULT_RENDERER} = options

const code = `${renderer}\n${result}`
const code = `${renderer}${pragma}${result}`
return callback(null, code)
}