feat: Add support for source phase imports

[bartlomieju]

Towards https://github.com/denoland/deno/issues/28013

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.50515% with 16 lines in your changes missing coverage. Please review.

Project coverage is 81.17%. Comparing base (0c7f83e) to head (5ba0cba). Report is 260 commits behind head on main.

Files with missing lines	Patch %	Lines
core/modules/map.rs	82.22%	16 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1081      +/-   ##
==========================================
- Coverage   81.43%   81.17%   -0.27%     
==========================================
  Files          97      101       +4     
  Lines       23877    28196    +4319     
==========================================
+ Hits        19445    22889    +3444     
- Misses       4432     5307     +875     

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[bartlomieju]

I don't think this is actually ready yet

[coderabbitai[bot]]

Walkthrough

The changes introduce infrastructure to store and retrieve WebAssembly module source objects within the module map. A new sources HashMap is added to ModuleMapData to persist module source objects keyed by module ID. The ModuleMap gains a source_callback helper method that resolves import specifiers and returns available source objects. The existing module_source_callback is reworked to throw type errors instead of syntax errors when module sources are unavailable, and now supports parsing static import attributes and resolving referrer names. New test files and updated test cases exercise WASM module imports with source phase semantics.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

• core/modules/map.rs: Callback refactoring and error handling changes require careful review to ensure proper fallback behavior and attribute parsing correctness
• core/modules/module_map_data.rs: HashMap storage field addition and retrieval logic are straightforward but must verify thread-safety assumptions for v8::Global<v8::Object>
• Test files: Verify that new WASM modules are correctly defined and test cases properly validate module properties and instantiation

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'feat: Add support for source phase imports' clearly and directly summarizes the main change in the changeset, which involves adding source phase import functionality to the module system.
Description check	✅ Passed	The description references a specific GitHub issue related to source phase imports, which is directly relevant to the changeset implementing this feature.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

✨ Finishing touches

• [ ] 📝 Generate docstrings

🧪 Generate unit tests (beta)

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment

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