babel-extract-named-export

babel-extract-named-export

Extract named exports from ES6 files using Babel.

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code example:

const fs = require('fs')
const extract = require('babel-extract-named-export')
const sample = fs.readFileSync('/path/to/file.js')

main()
async function main() {
  const res = await extract(sample)
  console.log(res) // { [...]: { ... } }
}

Optionally, pass a search array option to select keys you want to extract:

  const { meta } = await extract(sample, { search: ['meta'] })

If you need to override some properties of Babel transform function, you can pass a transformProps object like this:

  const { meta } = await extract(sample, { transformProps: { plugins: [/* ... */] } })

See @babel/standalone documentation here: https://babeljs.io/docs/en/standalone

When would you use this?

In my case, I wanted to build a small API out of some metadata stored along with MDX files. Some common cases include: stripping a named export at build time (think prop-types) or run a function server-side (think getStaticProps).