Migrate to ESM only #1002
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Migrate to ESM only #1002
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babel-loader 9 only supports webpack 5
In webpack 5.0.0, the mapObj.sources are [ 'webpack://babel-loader/./test/fixtures/basic.js', 'webpack://babel-loader/./test/fixtures/constant.js', 'webpack://babel-loader/./test/fixtures/import.js', 'webpack://babel-loader/webpack/bootstrap', 'webpack://babel-loader/webpack/startup' ] In later versions the `'webpack://babel-loader/./test/fixtures/basic.js'` is moved after webpack bootstrap, causing different indices across different webpack versions.
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Please Read the CONTRIBUTING Guidelines
In particular the portion on Commit Message Formatting
Please check if the PR fulfills these requirements
What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
Webpack 5.80.0 supports loaders written in ESM module. In this PR we migrate
babel-loaderto ESM and overhauls the test suites.Does this PR introduce a breaking change?
If this PR contains a breaking change, please describe the following...
Other information:
This PR depends on #1003, please review that PR first.
Given that webpack 5.80.0 was released only three months ago, I don't expect this PR will get merged soon.
Alternatively we can also ship a CJS build so that it can work with older webpack 5 versions.