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### 💥 BREAKING CHANGES -cf8296fecmascript: [**BREAKING**] Fold surrogate strings with JSStr constants (#27098) (Dunqing) ### 🚀 Features -dd6cb2bminifier: Fold out-of-bounds string indices to `void 0` (#28004) (Dunqing) ### 🐛 Bug Fixes -f4dac9esemantic: Separate hoisted vars from block type bindings (#27936) (limadog9) - 9ec6617 minifier: Keep brackets on negative and non-finite numeric keys (#27855) (Yunus Ozen) -520a26eminifier: Keep the default in shorthand assignment targets (#28183) (waltu) -def47b8react-compiler: Keep manual memoization as written when its dependencies can't be honoured (#28101) (Dunqing) -704d8cftransformer_plugins: Keep the bare inject when references to it remain (#26965) (Bharadwaj Pendyala) -6d7b372minifier: Handle sequence exprs when folding if to expr statement (#27939) (Armano) -e3eca41runtime: Align async iterator throw with Babel (#28059) (camc314) -af0258dparser: Parse source imports named type (#28062) (camc314) -83633a7parser: Parse escaped class field names after initializers (#28061) (camc314) -90c58acparser: Parse postfix updates of sloppy `let` identifiers (#28060) (camc314) -0e2934fcodegen: Preserve default import names in source maps (#28058) (camc314) -09bdb80minifier: Allow argument rewrite with with leading var assignments (#28056) (Armano) -ebcdcd9minifier: Preserve rest destructuring side effects (#27981) (camc314) -5c84098semantic,linter: Report names with lone surrogates in enum and lint checks (#27991) (Dunqing) -bd70a9becmascript: Use ECMAScript whitespace when folding `parseFloat`/`parseInt`/`trim` (#27719) (Dunqing) -4c0fa90minifier,linter: Keep `delete` of constant members and later JSX keys (#27990) (Dunqing) ### ⚡ Performance -3493ce3minifier: Reuse is_error_constructor and simplify substitute_global_new_expression (#28149) (Armano) -a22c9f2parser: Move annotation comment handling out of hot paths (#28139) (camc314) -1ed93afdata_structures: Copy short strings without a memcpy call (#27953) (leaysgur) ### 🛡️ Security -b93e169deps: Bump .node-version to 26.12.1 (#28090) (leaysgur) Co-authored-by: Dunqing <29533304+Dunqing@users.noreply.github.com>
Oxc Data Structures
Common data structures and utilities used across oxc crates.
Overview
This crate provides specialized data structures and utilities that are used throughout the oxc toolchain. These structures are optimized for the specific needs of compiler and tooling workloads.
Key Features
- Stacks: Efficient stack types, optimized for fast
push,pop, andlast - Code buffer: Efficient string building with segment tracking
- Inline strings: Memory-efficient string storage for short strings
- Slice iterators: Enhanced iteration capabilities for slices
- Rope data structure: Efficient text manipulation for large documents
- Box macros: Macros for creating boxed arrays / slices (similar to
vec!macro) - Fieldless enums macro: Macro for creating enums with a
VARIANTSconstant listing all variants - Non-null pointers:
NonNullConst<T>andNonNullMut<T>- non-null pointer types with explicit const/mut permissions - Branch prediction hints:
likelyandunlikelyfunctions to hint to the compiler whether a branch is likely to be taken (also re-exportsstd::hint::cold_path) StringExttrait: Add methods toStringto push without capacity checks- String utilities:
const-compatible string helpers (e.g.const_str_eqfor comparing strings in aconstcontext) - Type utilities:
implements!macro to determine if a type implements a trait
Architecture
These data structures are designed with specific compiler requirements in mind:
- Performance: Optimized for common patterns in parsing and code generation
- Memory efficiency: Minimize allocations and memory overhead
- Safety: Provide safe abstractions over potentially unsafe operations
- Ergonomics: Easy to use APIs that integrate well with other oxc components
The structures complement Rust's standard library with domain-specific optimizations for JavaScript/TypeScript tooling.