fix: respect corePackage/jsxPackage setting in experimental extractor

[mogelbrod]

Description

This PR updates the experimental extractor (lingui extract-experimental) to respect the macro.corePackage / macro.jsxPackage settings.

Up until now it only considers files that import directly from @lingui/*/macro for extraction using a hardcoded regex (/from ["']@lingui(\/.+)?\/macro["']/).

Fix

The pre-filter is now built from the configured macro packages (macro.corePackage + macro.jsxPackage) in addition to the built-in @lingui/*/macro entrypoints (kept for backwards compatibility, so the default config and the legacy @lingui/macro package keep working even when a project overrides corePackage/jsxPackage). The regex is also built once per plugin instance instead of per file, which removes a latent RegExp-with-/g + .test() lastIndex statefulness bug.

Tests

Added an integration test should extract messages imported from a configured custom macro package with a new fixture (packages/cli/test/extractor-experimental-custom-macro) that imports t, msg and <Trans> through a #macros subpath barrel declared in macro.corePackage / macro.jsxPackage, and asserts all three messages are extracted. The test fails on main (no messages extracted) and passes with this change. Existing extractor-experimental tests continue to pass, covering the backwards-compatible default behavior.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Examples update

Checklist

• I have read the CONTRIBUTING and CODE_OF_CONDUCT docs
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation (if appropriate)

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Project	Deployment	Actions	Updated (UTC)
js-lingui	Ready	Preview	Jun 18, 2026 9:11am

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.79%. Comparing base (6bb8983) to head (136a9dd).
⚠️ Report is 354 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2579       +/-   ##
===========================================
+ Coverage   77.05%   89.79%   +12.74%     
===========================================
  Files          84      124       +40     
  Lines        2157     3694     +1537     
  Branches      555     1109      +554     
===========================================
+ Hits         1662     3317     +1655     
+ Misses        382      339       -43     
+ Partials      113       38       -75     

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[timofei-iatsenko]

This is already covered in this complete rework of experimental extractor: #2572