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perf(minifier): avoid conversion from ident to str when for substitute symbols - #27209
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Dunqing
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Sep 30, 2026
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### 🚀 Features - 61003c7 minifier: Fold undefined argument in non delegating yield (#27324) (Armano) - 07833c0 ast: Tie `debug_name` return lifetime to the underlying AST node (#27295) (sadan) - adb1139 minifier: Merge import statements against the same module (#25534) (翠) - cc82598 minifier: Merge import and export statements against the same module (#25533) (翠) - 1c352ce minifier: Minimize bitwise binary expressions (#27107) (Armano) - d1a0bcc minifier: Merge statements after terminating if block branches (#26667) (Armano) - 7a95376 minifier: Merge adjucent if stmt with the same content (#26445) (Armano) ### 🐛 Bug Fixes - 6a7d48b parser: Report abstract private field error on modifier (#27314) (camc314) - 2ff6fb5 parser: Include generator marker in overload diagnostic span (#27313) (camc314) - 4359a66 parser: Reject TypeScript class modifiers in JavaScript (#27312) (camc314) - 565d75d minifier: Correct indopedency when processing nested sequences (#27273) (Armano) - d0b9372 parser: Remove type-dependent tuple rest diagnostics (#27234) (camc314) - 3d61a59 parser: Validate TypeScript type member separators (#27222) (camc314) - b2793fa parser: Reject module syntax in script (#27220) (leaysgur) - 5914a24 parser: Report `TS1243` for abstract async methods (#27192) (camc314) - c6c6e5e parser: Report `TS1242` for interfaces with `abstract` modifier (#27191) (camc314) - dd0bbb9 parser: Avoid duplicate index signature modifier diagnostic (#27190) (camc314) - 8f61129 regex: Decode escaped capturing group names (#27156) (camc314) - da1fed2 minifier: Fold conditional expressions with long sequences (#27083) (Armano) - 0c601f4 isolated-declarations: Allow adding undefined to keyof parameter types (#27173) (Dunqing) - 4896287 isolated-declarations: Support readonly parameter types (#27009) (sama Pyb) - 72d62a1 transformer/explicit-resource-management: Transform classic for loop using declarations (#27148) (camc314) - 4cf9ae2 minifier: Preserve sibling declarations in arguments copy rewrite (#27140) (camc314) - 24b7015 transformer/explicit-resource-management: Lower using in catch and finally (#27142) (camc314) ### ⚡ Performance - 99e3c15 minifier: Small performance improvement when merging imports (#27238) (Armano) - d37d1db codegen: Pre-allocate sourcemap builder vectors (#27230) (codspeed) - 466ef10 minifier: Update expressions in place in `merge_import_export` (#27226) (Armano) - 028ffb8 minifier: Update nodes in place in `wrap_to_avoid_ambiguous_else` (#27194) (Armano) - 6fcd135 minifier: Avoid conversion from ident to str when for substitute symbols (#27209) (Armano) - 0b9799d minifier: Reduce usage of minimize_conditional (#26028) (Armano) - 3ca3ded minifier: Short-circuit IfStatement termination on alternate (#25198) (Armano) ### 📚 Documentation - 335ce79 agents: Scope verification for local and stacked work (#27299) (Dunqing)
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