core-js 3 missing .js extension when 'type': 'module' #12378
Description
Bug Report
- I would like to work on a fix!
Current behavior
'type': 'module' is used in package.json and when corejs: 3 is specified in babel.config.js webpack complains about missing .js extension despite it existing in src/page.js. If I comment out corejs: 3 then the error goes away.
ERROR in ./src/page.js 1:0-37
Module not found: Error: Can't resolve 'core-js/modules/es.weak-set' in '/home/kieran/PhpstormProjects/babel-test/src'
Did you mean 'es.weak-set.js'?
BREAKING CHANGE: The request 'core-js/modules/es.weak-set' failed to resolve only because it was resolved as fully specified
(probably because the origin is a '*.mjs' file or a '*.js' file where the package.json contains '"type": "module"').
The extension in the request is mandatory for it to be fully specified.
Add the extension to the request.
I would be incredibly grateful if someone could put me out my misery.
Input Code
https://github.com/bytestream/babel-test
Expected behavior
I expect the code to transpile when using corejs 3.
Babel Configuration (babel.config.js, .babelrc, package.json#babel, cli command, .eslintrc)
- Filename:
babel.config.js
module.exports = {
presets: [
[
'@babel/preset-env',
{
'useBuiltIns': 'entry',
'corejs': 3, // <--- problematic line
}
]
],
plugins: [
// Don't allow polyfills to pollute global namespace.
'@babel/plugin-transform-runtime',
// Support for the experimental syntax 'classPrivateProperties'
'@babel/plugin-proposal-class-properties',
// Support for the experimental syntax 'classPrivateMethods'
'@babel/plugin-proposal-private-methods',
]
};Environment
$ npx envinfo --preset babel
System:
OS: Linux 4.9 Debian GNU/Linux 9 (stretch) 9 (stretch)
Binaries:
Node: 12.19.0 - /usr/bin/node
Yarn: 1.22.4 - /usr/bin/yarn
npm: 6.14.8 - /usr/bin/npm
npmPackages:
@babel/core: ^7.12.3 => 7.12.3
@babel/plugin-proposal-class-properties: ^7.12.1 => 7.12.1
@babel/plugin-proposal-private-methods: ^7.12.1 => 7.12.1
@babel/plugin-transform-runtime: ^7.12.1 => 7.12.1
@babel/preset-env: ^7.12.1 => 7.12.1
@babel/runtime-corejs3: ^7.12.5 => 7.12.5
babel-loader: ^8.2.1 => 8.2.1
webpack: ^5.6.0 => 5.6.0
Possible Solution
Additional context