Snowpack - The requested module '/web_modules/recoil.js' does not provide an export named 'RecoilRoot'

Introduction

I started learning Snowpack and have been pleased with the speed and development experience.

As I was learning Recoil, a new React state management library by Facebook (but not by React core team), I was running into following error message.

Uncaught SyntaxError: The requested module '/web_modules/recoil.js' does not provide an export named 'RecoilRoot'

I will talk about how to get around the issue and this won't be about how to use Snowpack or Recoil.

Reproducing the error

I used Create Snowpack App (CSA) with a React template, @snowpack/app-template-react to bootstrap a new React project.

npx create-snowpack-app new-dir --template @snowpack/app-template-react --use-yarn

And then installed Recoil as a dependency.

yarn add recoil

I initially wrapped the root element with RecoilRoot.

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';

// imported 👇 as shown in the Reoil doc
// https://recoiljs.org/docs/introduction/getting-started/#recoilroot
import { RecoilRoot } from 'recoil';

import './index.css';

ReactDOM.render(
  <React.StrictMode>
    <RecoilRoot>
      <App />
    </RecoilRoot>
  </React.StrictMode>,
  document.getElementById('root'),
);

// Hot Module Replacement (HMR) - Remove this snippet to remove HMR.
// Learn more: https://www.snowpack.dev/#hot-module-replacement
if (import.meta.hot) {
  import.meta.hot.accept();
}

But then the error mentioned in the "Introduction" occurred.

Resolution

It looks like Snowpack has an issue with CJS (CommonJS) libraries according this issue, https://github.com/pikapkg/snowpack/issues/440.

The resolution in the GitHub issue is not to use named export, but to import the whole module.

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';

// Import 👇 the library as a whole
import Recoil from 'recoil';

import './index.css';

ReactDOM.render(
  <React.StrictMode>
    {/* 👇 Explicitly named element */}
    <Recoil.RecoilRoot>
      <App />
    </Recoil.RecoilRoot>
  </React.StrictMode>,
  document.getElementById('root'),
);

// Hot Module Replacement (HMR) - Remove this snippet to remove HMR.
// Learn more: https://www.snowpack.dev/#hot-module-replacement
if (import.meta.hot) {
  import.meta.hot.accept();
}

This means, everywhere you use Recoil, you need to import the whole module.
I found it a bit annoying but haven't been able to find out a better solution.

Please leave a comment if you can share a different way :)

---

Image by zmortero from Pixabay

Comments

[Clément Danjou]

I've started a discussion on GitHub since I try to make recoil work with namedExports option.
github.com/pikapkg/snowpack/discus...