fix: workaround for weirdly packaged cjs modules

[yepitschunked]

Motivation

We found a weird bug when shaker attempted to operate on preact/compat. Note that it's probably a bug that shaker is even processing this file, since it means we didn't strip the import in an earlier stage, but I'm not sure what's going on there.

I think the issue is demonstrated pretty clearly in the unit test, but the gist is that certain libraries might be packaged in a way where they have a default export, but no __esModule: true export. This will break babel's interopRequireDefault helper, which wraps its argument if it doesn't detect __esModule: true, resulting in an object like { default: { default: someExport } }.

In the case of preact/compat, this is fine, because all of the exports are also defined directly on module.exports. resulting in { default: { default: someExport, someExport } }. So even if interopRequireDefault produces a broken result, interopRequireDefault(...).default.someExport still exists.

Thee trouble comes when shaker deletes someExport because it was not in onlyExports, leaving only the default export; now, interopRequireDefault produces { default: { default: someExport } } and interopRequireDefault(...).default.someExport will be undefined.

Summary

I added detection of __esModule to collectImportAndExports. Now, if we detect that default is in onlyExports, and the module is not an esModule, we'll skip the shaker process as it will be unsafe.

Test plan

Added a unit test.

[changeset-bot]

🦋 Changeset detected

Latest commit: b443e53

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 23 packages

Name	Type
@linaria/shaker	Patch
@linaria/testkit	Patch
@linaria/utils	Patch
@linaria/babel-preset	Patch
linaria	Patch
linaria-website	Patch
vite-example	Patch
@linaria/atomic	Patch
@linaria/cli	Patch
@linaria/core	Patch
@linaria/esbuild	Patch
@linaria/griffel	Patch
@linaria/react	Patch
@linaria/rollup	Patch
@linaria/stylelint	Patch
@linaria/tags	Patch
@linaria/vite	Patch
@linaria/webpack4-loader	Patch
@linaria/webpack5-loader	Patch
esbuild-example	Patch
rollup-example	Patch
vpssr-linaria-solid-example	Patch
@linaria/webpack-loader	Patch

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