perf(parser): avoid redundant IdentifierReference clone in shorthand property#21511
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perf(parser): avoid redundant IdentifierReference clone in shorthand property#21511
IdentifierReference clone in shorthand property#21511Conversation
…d property Build `value` after handling `=`, and allocate a fresh `IdentifierReference` in each branch instead of cloning. Saves one clone per shorthand property. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Merging this PR will not alter performance
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### 🐛 Bug Fixes - 48967e8 isolated_declarations: Drop required type check for private parameter properties on private constructors (#21515) (Dunqing) - 91e5bde transformer/typescript: Preserve computed-key static block when class has an empty constructor (#21562) (Dunqing) - 50e9d26 mangler: Assign correct slot to shadowed function-expression names (#21535) (Dunqing) - 065ce47 isolated_declarations: Collect types from private accessors for paired inference (#21516) (Dunqing) - 00fc136 codegen: Preserve coverage comments before object properties (#21312) (bab) - d676e0c minifier: Mark LHS of `??=` as read when converting from `== null &&` (#21546) (Gunnlaugur Thor Briem) ### ⚡ Performance - e45efc5 parser: Reduce `try_parse` usage in favour of `lookahead` (#21532) (Boshen) - ddb1bf8 parser: Avoid redundant `IdentifierReference` clone in shorthand property (#21511) (Boshen) - be2b392 allocator: Store pointers directly in `Arena` (#21483) (overlookmotel) Co-authored-by: Boshen <1430279+Boshen@users.noreply.github.com> Co-authored-by: Cameron <cameron.clark@hey.com>
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Summary
In
parse_object_literal_element, the shorthand-property path builtvalueeagerly and cloned theIdentifierReferenceso it could be reused for theCoverInitializedName({ foo = bar }) case. In the common{ foo }path the clone was always wasted.Build
valueafter peeking=, and allocate a freshIdentifierReferencein each branch. One.clone()removed per shorthand property.