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perf(isolated_declarations): mark all diagnostic functions as #[cold]#19279

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Feb 12, 2026
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perf(isolated_declarations): mark all diagnostic functions as #[cold]#19279
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c/02-11-perf_isolated_declarations_mark_all_diagnostic_functions_as_cold_

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@camc314 camc314 mentioned this pull request Feb 11, 2026
@github-actions github-actions bot added A-isolated-declarations Isolated Declarations C-performance Category - Solution not expected to change functional behavior, only performance labels Feb 11, 2026
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Merging this PR will not alter performance

✅ 47 untouched benchmarks
⏩ 3 skipped benchmarks1


Comparing c/02-11-perf_isolated_declarations_mark_all_diagnostic_functions_as_cold_ (06426e0) with main (2879fc5)

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  1. 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.

@camc314 camc314 marked this pull request as ready for review February 11, 2026 18:28
@camc314 camc314 requested a review from Dunqing as a code owner February 11, 2026 18:28
Copilot AI review requested due to automatic review settings February 11, 2026 18:28
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Pull request overview

This PR optimizes oxc_isolated_declarations diagnostic construction by marking diagnostic helper functions as cold paths, helping the compiler keep error-only code out of hot instruction paths.

Changes:

  • Added #[cold] to diagnostic-constructor functions in diagnostics.rs to hint they’re rarely executed.
  • No functional changes to diagnostic creation logic.
Comments suppressed due to low confidence (2)

crates/oxc_isolated_declarations/src/diagnostics.rs:90

  • Diagnostic message has a grammatical error: "can't inferred" should be "can't be inferred".
    OxcDiagnostic::error(
        "TS9018: Arrays with spread elements can't inferred with --isolatedDeclarations.",
    )

crates/oxc_isolated_declarations/src/diagnostics.rs:128

  • Diagnostic message uses "it's" ("it is") where the possessive "its" is intended.
    OxcDiagnostic::error(
        "TS9025: Declaration emit for this parameter requires implicitly adding undefined to it's type. This is not supported with --isolatedDeclarations.",
    )

@Boshen Boshen added the 0-merge Merge with Graphite Merge Queue label Feb 12, 2026
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Boshen commented Feb 12, 2026

Merge activity

@graphite-app graphite-app bot force-pushed the c/02-11-perf_isolated_declarations_mark_all_diagnostic_functions_as_cold_ branch from 06426e0 to 99ce2a6 Compare February 12, 2026 06:17
@graphite-app graphite-app bot merged commit 99ce2a6 into main Feb 12, 2026
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@graphite-app graphite-app bot deleted the c/02-11-perf_isolated_declarations_mark_all_diagnostic_functions_as_cold_ branch February 12, 2026 06:23
@graphite-app graphite-app bot removed the 0-merge Merge with Graphite Merge Queue label Feb 12, 2026
camc314 pushed a commit that referenced this pull request Feb 16, 2026
### 🚀 Features

- 429d876 semantic: Assign ast node ids during semantic build (#19263)
(Boshen)
- ebb80b3 ast: Add `node_id` field to all AST struct nodes (#18138)
(Boshen)

### 🐛 Bug Fixes

- bfb15a3 semantic: Make multi_index_vec clone panic-safe (#19299)
(Boshen)
- 41c50a5 transformer: Ignore invalid JSX pragma identifiers (#19296)
(Boshen)
- deed3d8 transformer: Remove unnecessary trailing expression in object
rest spread assignment (#19259) (Boshen)
- 5bdaacc transformer: Propagate source spans for sourcemap correctness
(#19258) (Boshen)
- 3e0e5ba isolated-declarations: Align readonly class array initializer
diagnostics with tsc (#19218) (camc314)

### ⚡ Performance

- c169c77 syntax: Optimize `is_identifier_name_patched` (#19386)
(sapphi-red)
- aa1e1a8 allocator: Inline BitSet accessors (#19331) (Boshen)
- 5b90d46 semantic: Improve SoA with multi index vec (#19138) (Boshen)
- 99ce2a6 isolated_declarations: Mark all diagnostic functions as
`#[cold]` (#19279) (camc314)
- dd0220f transformer: Remove TS-only nodes earlier in
`enter_statements` (#19166) (Dunqing)
- e5baf60 isolated-declarations: Replace hash collections with
index-based Vec (#19221) (Dunqing)

### 📚 Documentation

- 569aa61 rust: Add missing rustdocs and remove missing_docs lint attrs
(#19306) (Boshen)
OskarLebuda pushed a commit to OskarLebuda/oxc that referenced this pull request Feb 17, 2026
OskarLebuda pushed a commit to OskarLebuda/oxc that referenced this pull request Feb 17, 2026
### 🚀 Features

- 429d876 semantic: Assign ast node ids during semantic build (oxc-project#19263)
(Boshen)
- ebb80b3 ast: Add `node_id` field to all AST struct nodes (oxc-project#18138)
(Boshen)

### 🐛 Bug Fixes

- bfb15a3 semantic: Make multi_index_vec clone panic-safe (oxc-project#19299)
(Boshen)
- 41c50a5 transformer: Ignore invalid JSX pragma identifiers (oxc-project#19296)
(Boshen)
- deed3d8 transformer: Remove unnecessary trailing expression in object
rest spread assignment (oxc-project#19259) (Boshen)
- 5bdaacc transformer: Propagate source spans for sourcemap correctness
(oxc-project#19258) (Boshen)
- 3e0e5ba isolated-declarations: Align readonly class array initializer
diagnostics with tsc (oxc-project#19218) (camc314)

### ⚡ Performance

- c169c77 syntax: Optimize `is_identifier_name_patched` (oxc-project#19386)
(sapphi-red)
- aa1e1a8 allocator: Inline BitSet accessors (oxc-project#19331) (Boshen)
- 5b90d46 semantic: Improve SoA with multi index vec (oxc-project#19138) (Boshen)
- 99ce2a6 isolated_declarations: Mark all diagnostic functions as
`#[cold]` (oxc-project#19279) (camc314)
- dd0220f transformer: Remove TS-only nodes earlier in
`enter_statements` (oxc-project#19166) (Dunqing)
- e5baf60 isolated-declarations: Replace hash collections with
index-based Vec (oxc-project#19221) (Dunqing)

### 📚 Documentation

- 569aa61 rust: Add missing rustdocs and remove missing_docs lint attrs
(oxc-project#19306) (Boshen)
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