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fix(parser): apply PURE comment through member-access chains#22566

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fix/parser-pure-comment-member-chain
May 19, 2026
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fix(parser): apply PURE comment through member-access chains#22566
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fix/parser-pure-comment-member-chain

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@Dunqing Dunqing commented May 19, 2026

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/* #__PURE__ */ test().a.b.c was marked as PureNotApplied because set_pure_on_call_or_new_expr only checked the top-level AST node. For member-access chains rooted at a call/new, the top-level node is a MemberExpression, which fell through to the _ => false arm.

Rollup and esbuild apply PURE to the innermost call/new in this shape (member-access side effects are handled separately by propertyReadSideEffects in Rollup). Aligning here fixes false-positive warnings in downstream consumers that forward PureNotApplied to users (e.g. rolldown/rolldown#9381).

Recurse through StaticMemberExpression, ComputedMemberExpression, PrivateFieldExpression, and the matching ChainElement variants (plus TSNonNullExpression in chains) to reach the underlying call.

Fixes #22394

AI disclosure: implemented with Claude Code, reviewed manually.

Dunqing commented May 19, 2026

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@github-actions github-actions Bot added A-parser Area - Parser A-codegen Area - Code Generation labels May 19, 2026
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Merging this PR will not alter performance

✅ 48 untouched benchmarks
⏩ 3 skipped benchmarks1


Comparing fix/parser-pure-comment-member-chain (1710bee) with main (ea6b4d6)

Open in CodSpeed

Footnotes

  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.

@Dunqing Dunqing marked this pull request as ready for review May 19, 2026 08:41
@Dunqing Dunqing requested a review from camc314 May 19, 2026 08:41

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nice!

@camc314 camc314 added the 0-merge Merge with Graphite Merge Queue label May 19, 2026

camc314 commented May 19, 2026

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`/* #__PURE__ */ test().a.b.c` was marked as `PureNotApplied` because `set_pure_on_call_or_new_expr` only checked the top-level AST node. For member-access chains rooted at a call/new, the top-level node is a `MemberExpression`, which fell through to the `_ => false` arm.

Rollup and esbuild apply PURE to the innermost call/new in this shape (member-access side effects are handled separately by `propertyReadSideEffects` in Rollup). Aligning here fixes false-positive warnings in downstream consumers that forward `PureNotApplied` to users (e.g. rolldown/rolldown#9381).

Recurse through `StaticMemberExpression`, `ComputedMemberExpression`, `PrivateFieldExpression`, and the matching `ChainElement` variants (plus `TSNonNullExpression` in chains) to reach the underlying call.

Fixes #22394

AI disclosure: implemented with Claude Code, reviewed manually.
@graphite-app graphite-app Bot force-pushed the fix/parser-pure-comment-member-chain branch from 1710bee to 917da24 Compare May 19, 2026 08:54
@graphite-app graphite-app Bot merged commit 917da24 into main May 19, 2026
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@graphite-app graphite-app Bot deleted the fix/parser-pure-comment-member-chain branch May 19, 2026 08:57
@graphite-app graphite-app Bot removed the 0-merge Merge with Graphite Merge Queue label May 19, 2026
Dunqing added a commit that referenced this pull request May 26, 2026
### 🚀 Features

- e857b0c napi/minify: Expose legalComments option and result (#20370)
(Boshen)
- 661132d parser: More friendly error messages for rest assignment
target and rest binding element (#22719) (sapphi-red)
- ee659b6 transformer/legacy-decorator: Add `strictNullChecks` option
for nullable-union design:type (#22266) (Kyle Cannon)

### 🐛 Bug Fixes

- e1d064e transformer/class-properties: Reparent lifted private method
helpers (#22716) (Cameron)
- 4ac0fca minifier: Preserve `0 && (module.exports = { ... })`
cjs-module-lexer hint (#22729) (Dunqing)
- 40ff611 minifier: Mark peephole loop changed when dropping
dead-after-throw statement (#22722) (Dunqing)
- 2f7b210 codegen: Emit pife-arrow/function leading comments inside the
wrap (#22720) (Dunqing)
- e184f74 parser: Improve invalid `import` property access diagnostic
(#22693) (camc314)
- 7baed9c transformer/private-method: Clear inherited strict flags
(#22508) (camc314)
- a9ad27e parser: Keep annotation comments leading without preceding
newline (#22711) (Dunqing)
- 9ea4d64 minifier: Re-evaluate pure/no-side-effects flags after
peephole inlining (#22595) (Dunqing)
- 07afbb6 minifier: Drop empty-body IIFE wrapper when called with
arguments (#22589) (Dunqing)
- fa7c463 semantic: Correct TS enum member symbol spans (#22689)
(camc314)
- 26b9396 semantic: Resolve parameter decorators outside parameter scope
(#22623) (camc314)
- b284045 parser: Switch to module goal eagerly on `export` (#22684)
(Boshen)
- dfa931d semantic: Propagate unresolved auto-increment enum value
instead of defaulting to 0 (#22646) (Dunqing)
- 69a6ba6 transformer/legacy-decorator: Emit Array for ReadonlyArray<T>
in decorator metadata (#22265) (Kyle Cannon)
- e421ef0 transformer/legacy-decorator: Return runtime binding for
design:type (#22640) (Dunqing)
- d61e1d7 codegen: Preserve verbatim text of pure/no-side-effects
comments (#22525) (Dunqing)
- 702b14e minifier: Preserve IIFE structure in DCE-only mode (#22547)
(Dunqing)
- 917da24 parser: Apply PURE comment through member-access chains
(#22566) (Dunqing)
- a069b1c codegen: Preserve quotes for cjs-module-lexer equality strings
(#22551) (Dunqing)

### ⚡ Performance

- 2f623b0 semantic: Skip unresolved checks for re-exports (#22660)
(camc314)
- 0d9553d semantic: Early-exit `check_object_expression` for objects
with <2 properties (#22668) (Dunqing)
- d721ad9 semantic: Use direct grandparent lookup for TS type parameters
(#22658) (camc314)
- 0aff288 semantic: Reorder numeric literal strict mode checks (#22657)
(camc314)
- 4d5ddb1 semantic: Reorder binding identifier checks (#22656) (camc314)
- e32acd8 semantic: Reorder identifier ambient binding check (#22653)
(camc314)
- 09fe178 semantic: Reorder ident reference strict mode check (#22652)
(camc314)
- 4b6add2 semantic: Avoid duplicate ident clone for bindings (#22663)
(camc314)
- 82f9662 parser: Check identifier kind before context flag (#22662)
(camc314)
- d7cd951 parser: Fast path identifier parsing and inline operator
helpers (#22650) (Boshen)
- 7b84314 semantic: Use direct byte access for numeric leading-zero
check (#22642) (camc314)
- 0345a31 semantic: Pre-size class elements hash map (#22618) (camc314)
- 04d3065 minifier: Drop per-call buffers in try_fold_concat (#22596)
(Dunqing)
- 4f289f1 semantic: Resolve_references_for_current_scope without a temp
Vec (#22599) (Dunqing)
- e862c15 semantic: Avoid heap alloc for var hoist scope ids (#22603)
(Dunqing)
- 8ff8674 semantic: Early return if `excess` is `0` in
`Stats::increase_by` (#22616) (camc314)
- 7a4120e semantic: Pre-reserve unresolved_references using
Stats::references (#22580) (Dunqing)

Co-authored-by: Dunqing <29533304+Dunqing@users.noreply.github.com>
shulaoda added a commit to rolldown/rolldown that referenced this pull request May 27, 2026
## Summary

- Bump oxc Rust crates and `@oxc-project/*` / `oxc-*` npm packages from `0.132.0` to `0.133.0`. ~~Bump `oxc_resolver` / `oxc_resolver_napi` from `11.19.1` to `11.19.2`.~~
- Regenerate `embedded_helpers.rs` to point at `@oxc-project+runtime@0.133.0` (version string only — no helper-content drift).
- Handle two new oxc fields surfaced by `cargo check`:
  - `oxc::transformer::DecoratorOptions.strict_null_checks` — hardcoded to `true` in the `From` impl (matches oxc's default). Exposing it through rolldown's wrapper would be a separate API change.
  - `oxc_minify_napi::CodegenOptions.legal_comments` — set to `None`.
- Extend `DecoratorOptionSchema` and `CodegenOptionsSchema` in `validator.ts` to mirror the new optional fields.
- Refresh 32 snapshots driven by upstream oxc PR [#22547](oxc-project/oxc#22547) ("fix(minifier): preserve IIFE structure in DCE-only mode"). In DCE-only mode (rolldown's per-module preprocess via `Compressor::dead_code_elimination_with_scoping`), oxc no longer inlines `(() => …)()` IIFEs that carry — or could carry — `/*#__PURE__*/` annotations, so downstream tree-shaking can see them. Empty-IIFE elision still fires. Side effects: `property_read_side_effects` now correctly tree-shakes `/*#__PURE__*/ test().a.b.c;` lines and drops the previously spurious `INVALID_ANNOTATION` warnings; TS class `(() => new Foo())()` patterns and `Symbol((() => Math.random() < 0.5)() ? …)` calls are preserved as the sources actually wrote them; `dce_of_iife/diff.md` divergence vs esbuild shrunk.

## Issues fixed

Pulled in from upstream oxc fixes between 0.132.0 and 0.133.0:

- Fixes #9437 — Pure-annotated IIFE returning an array is inlined (via oxc [#22547](oxc-project/oxc#22547))
- Fixes #9494 — Cross-module enum inlining mis-folds auto-increment member to 0 (via oxc [#22646](oxc-project/oxc#22646))
- Fixes #9408 — Rolldown drops `@preserve` from `/* #__PURE__ -- @preserve */` comments (via oxc [#22525](oxc-project/oxc#22525) "preserve verbatim text of pure/no-side-effects comments")
- Partially addresses #8688 — `dce/dce_of_iife` esbuild divergence shrunk (via oxc [#22589](oxc-project/oxc#22589) "drop empty-body IIFE wrapper when called with arguments")

Also relevant: oxc [#22566](oxc-project/oxc#22566) reduces false-positive `PureNotApplied` warnings (the warnings system landed in rolldown #9381) by applying PURE through member-access chains.

## Test plan

- [x] `cargo check --workspace --all-targets`
- [x] `just update-generated-code`
- [x] `just test-update`
- [x] `just ued`
- [x] `just roll` — 32 Rust suites pass (0 failed), 1212 node tests pass (0 failed), TS lint+types clean on 804 files

---------

Co-authored-by: shulaoda <165626830+shulaoda@users.noreply.github.com>
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parser: PureNotApplied marks chained-call patterns that Rollup/esbuild consider valid

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