Basic implementation of using microbundle not working

Question

Please see example repo https://github.com/inspiraller/webpack-and-microbundle

---

Microbundle code

mymicrobundle/src/index.js

import React from 'react'

const MyMicroBundle = ({session}) => {
  return (
    <div>Session = {session}</div>
  )
}

export default MyMicroBundle

microbundle/package.json - for output

{
 ...
  "source": "src/index.js",
  "main": "dist/index.umd.js",
  "module": "dist/index.module.js",
  "exports": "dist/index.modern.js",
  "unpkg": "dist/index.umd.js"
}

---

Importing Microbundle code

webpack-loads-microbundle/package.json

{
"dependencies": {
    "@mymicrobundle/example": "file:../mymicrobundle",
  }
}

webpack-load-microbundle/src/index.tsx

import React, { useState } from 'react'
import ReactDOM from 'react-dom'
import MyMicroBundle from '@mymicrobundle/example'

import './index.scss'

const App = () => {
  const [session, setSession] = useState('')
  return (
    <div>
      <h1>Hello</h1>
    </div>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))

Note: The microbundle package is bundled as javascript, but I'm using typescript to import it. Though shouldn't make any difference. I'm also using pnpm instead of npm but also this should be fine as all other imports work.

Something about my path is wrong maybe.

Error

Module not found: Error: Can't resolve '@mymicrobundle/example' in 'C:\baps\react_all\webpack-and-microbundle\webpack-loads-microbundle\src'

Answer 1

webpack resolves modules from its process.cwd()/node_modules by default.

So in your case it is looking for @mymicrobundle/example in webpack-and-microbundle(the current working directory) which is your app directory.

You need to let webpack know, where it needs to search in addition to your project's node_modules.

This can be done using the resolve.modules key. See docs: https://webpack.js.org/configuration/resolve/#resolvemodules

So your webpack config should have something like:

 resolve: {
    modules: ['node_modules', 'path/to/@mymicrobundle/example'],
  },