react / react/metro

Babel not Transforming Extra Modules

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Dominant language
JavaScript
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Description

Do you want to request a feature or report a bug?

Bug

What is the current behavior?

When specifying an extra node module in the config, Babel doesn't seem to be transforming the file properly:

metro.config.js

const extraNodeModules = {
  '@apollosproject/config': path.resolve(
    `${__dirname}/../../apollos-apps/packages/apollos-config/`
  ),
}

module.exports = {
  resolver: {
    extraNodeModules,
  },
};

Bundle Error:

error: bundling failed: Error: Unable to resolve module `@babel/runtime/helpers/interopRequireDefault` from `/Users/michael/Documents/Projects/apollos/apollos-apps/packages/apollos-config/react-native/index.js`: Module `@babel/runtime/helpers/interopRequireDefault` does not exist in the Haste module map

index.js file in question:

import NativeConfig from 'react-native-config';
...
...
...

If the current behavior is a bug, please provide the steps to reproduce and a minimal repository on GitHub that we can yarn install and yarn test.

A minimal example would be very hard to repro as I am "linking" external modules.

What is the expected behavior?

The bundle builds properly.

Please provide your exact Metro configuration and mention your Metro, node, yarn/npm version and operating system.

RN: 60
Node: 15
Yarn: 1.22
OS: Mac 11

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with metro.config.js and the linked module's react-native/index.js, then reproduce the bundle using the extraNodeModules configuration. Check how Babel output references @babel/runtime/helpers/interopRequireDefault; done means the bundle builds and resolves that dependency correctly.

Written by the indexing model from the issue text.

Assessment

Tech stack
babel, javascript, react-native
Domain
build-system, mobile-dev
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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