"export *" prevent shaking and removal of unused code

[layershifter]

Environment

• Linaria version: @linaria/core@4.5.4, @linaria/webpack-loader@4.5.4
• Bundler (+ version): Webpack 5
• Node.js version: Node 16
• OS: N/A

Description

The fixture in the repro case is based on the real project where a lot of "export *" are used. This confuses current parsing/shaking logic and forces to evaluate more code than needed, in this case:

class MockMediaQueryList extends EventTarget {
  constructor(media, matches = false) {
    super();
    this.media = media;
    this.matches = matches;
  }
}

RROR in ./src/index.js
Module build failed (from ./node_modules/@linaria/webpack-loader/lib/index.js):
EvalError: Class extends value undefined is not a constructor or null in
| /home/projects/stackblitz-starters-aw9m5a/src/lib/hooks/useMedia.js
| /home/projects/stackblitz-starters-aw9m5a/src/lib/hooks/index.js
| /home/projects/stackblitz-starters-aw9m5a/src/lib/dialog.js
| /home/projects/stackblitz-starters-aw9m5a/src/lib/index.js
| /home/projects/stackblitz-starters-aw9m5a/src/index.js

    at Module.evaluate (file:///home/projects/stackblitz-starters-aw9m5a/node_modules/@linaria/babel-preset/lib/module.js:350:13)
    at require.Object.assign.ensure (file:///home/projects/stackblitz-starters-aw9m5a/node_modules/@linaria/babel-preset/lib/module.js:289:13)
    at eval (file:///home/projects/stackblitz-starters-aw9m5a/src/lib/hooks/index.js:6:17)
    at eval (file:///home/projects/stackblitz-starters-aw9m5a/src/lib/hooks/index.js:28:3)

This fixture is good by two reasons:

• it shows the problem with export *
• it shows the problem with removing DOM related things where they are used in extends

Reproducible Demo

• Open https://stackblitz.com/edit/stackblitz-starters-aw9m5a
• Run yarn
• Run yarn webpack

[layershifter]

This have been fixed in v5.