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perf(semantic): skip checking unresolved exports in CommonJS files#18250

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Jan 19, 2026
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perf(semantic): skip checking unresolved exports in CommonJS files#18250
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@overlookmotel overlookmotel commented Jan 19, 2026

Another follow-up after #18089.

Skip checking export declarations in CommonJS files. CommonJS files can't contain export declarations, so there's no point searching for them.

@github-actions github-actions bot added A-semantic Area - Semantic C-performance Category - Solution not expected to change functional behavior, only performance labels Jan 19, 2026
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@overlookmotel overlookmotel marked this pull request as ready for review January 19, 2026 15:12
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Pull request overview

This PR optimizes the performance of the semantic checker by skipping unnecessary export resolution checks in CommonJS files. Following PR #18089 which added CommonJS support, this change recognizes that CommonJS files cannot contain export declarations, so there's no point in checking for unresolved exports in them.

Changes:

  • Modified the early return condition in check_unresolved_exports to use !is_module() instead of is_script(), ensuring CommonJS files are also skipped
  • Added a blank line for better code formatting

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codspeed-hq bot commented Jan 19, 2026

CodSpeed Performance Report

Merging this PR will not alter performance

Comparing om/01-19-perf_semantic_skip_checking_unresolved_exports_in_commonjs_files (b626092) with main (2349031)1

Summary

✅ 42 untouched benchmarks
⏩ 3 skipped benchmarks2

Footnotes

  1. No successful run was found on main (8a294d5) during the generation of this report, so 2349031 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report.

  2. 3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports.

@Boshen Boshen added the 0-merge Merge with Graphite Merge Queue label Jan 19, 2026
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Boshen commented Jan 19, 2026

Merge activity

…18250)

Another follow-up after #18089.

Skip checking export declarations in CommonJS files. CommonJS files can't contain `export` declarations, so there's no point searching for them.
@graphite-app graphite-app bot force-pushed the om/01-19-perf_semantic_skip_checking_unresolved_exports_in_commonjs_files branch from b626092 to 7c12743 Compare January 19, 2026 16:53
@graphite-app graphite-app bot merged commit 7c12743 into main Jan 19, 2026
21 checks passed
@graphite-app graphite-app bot deleted the om/01-19-perf_semantic_skip_checking_unresolved_exports_in_commonjs_files branch January 19, 2026 16:59
@graphite-app graphite-app bot removed the 0-merge Merge with Graphite Merge Queue label Jan 19, 2026
overlookmotel pushed a commit that referenced this pull request Jan 26, 2026
### 💥 BREAKING CHANGES

- 22dec6a semantic: [**BREAKING**] Remove
`Scoping::scope_build_child_ids` and all related APIs (#18362) (Dunqing)
- 30a4899 oxc: [**BREAKING**] Remove
`CompilerInterface::semantic_child_scope_ids` (#18361) (Dunqing)
- 777fc40 ast: [**BREAKING**] Add `Ident` type (#18354) (Boshen)
- af0ca46 span: [**BREAKING**] Use `ModuleKind::CommonJS` for
`SourceType::cjs()` (#18276) (sapphi-red)

### 🚀 Features

- 0a02026 semantic: Add TS1499 code to diagnostic (#18557) (camc314)
- 8b4618f parser: Add TS1500 code to diagnostic (#18547) (camc314)
- 866b6b3 parser: Add TS1048 code to diagnostic (#18546) (camc314)
- 1117c44 parser: Add TS1054 code to diagnostic (#18541) (camc314)
- e4fcdde semantic: Add TS1053 code to diagnostic (#18539) (camc314)
- bcbf396 semantic: Add TS1052 code to diagnostic (#18538) (camc314)
- 8155edf semantic: Add TS1049 code to diagnostic (#18535) (camc314)
- 51d3b3f parser: Add TS1502 code to diagnostic (#18534) (camc314)
- 00854e8 semantic: Add TS2337 error code to super call diagnostic
(#18531) (camc314)
- 993fd2b parser: Parse unambiguous await with better error messages
(#18480) (Boshen)
- 8db0e78 linter/plugins: Handle BOMs (#18376) (overlookmotel)
- 6ac09e2 linter/plugins: Support source text not being at start of
buffer (#18375) (overlookmotel)
- 2ef5647 ast: Add escape_raw parameter to template_element builders
(#18121) (Boshen)

### 🐛 Bug Fixes

- 74d0998 semantic: Update error msg for multiple `default` cases in
switch stmt (#18526) (camc314)
- c205b0d ast: Remove `ThisExpression` from `TSModuleReference` (#18489)
(Boshen)
- aed3669 parser: Parse HTML-like comments in unambiguous mode (#18442)
(Boshen)
- c4132fb parser: Validate accessor parameters in interface method
signatures (#18391) (Boshen)
- b0cd74d semantic: Allow `var` and `function` with same name in static
blocks (#18358) (Boshen)
- 6037995 semantic: Allow `new.target` in class field initializers
(#18349) (Boshen)
- 9a15c6a semantic: Do not rely on spans for node comparison in
`Function::bind` (#18296) (overlookmotel)

### ⚡ Performance

- 6b600c4 semantic: Skip parent lookup for function declarations in
`Function::bind` (#18293) (overlookmotel)
- c27ad2d semantic: Move check for function declaration out of
`is_function_part_of_if_statement` (#18292) (overlookmotel)
- 63eb89e semantic: Skip checking redeclarations for function
expressions (#18291) (overlookmotel)
- 7c12743 semantic: Skip checking unresolved exports in CommonJS files
(#18250) (overlookmotel)
- 2349031 allocator: Increase initial chunk size from 512B to 16KB
(#18234) (Boshen)

### 📚 Documentation

- 8ccd853 npm: Update package homepage URLs and add keywords (#18509)
(Boshen)
- 9b3165f napi/parser: Clarify when to use `parseAsync` vs `parseSync`
(#18486) (Boshen)
- 1b59f63 napi/parser: Correct typo in README (#18251) (overlookmotel)
- 00ff75f mangler: Fix `top_level` option in example (#18233)
(overlookmotel)
- 2ddc073 semantic: Fix typo in comment (#18238) (overlookmotel)

Co-authored-by: Boshen <[email protected]>
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