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oxc-guard
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### 💥 BREAKING CHANGES -a31567aallocator: [**BREAKING**] Make `Allocator::cursor_ptr` and `data_end_ptr` private (#26081) (overlookmotel) ### 🚀 Features -784e9faminifier: Invert `!0` and `!1` in place for boolean context to `1` and `0` (#26050) (Armano) -1e902ccminifier: Expand fold leading assignments into the var decl (#26142) (Armano) -3ed4f6aminifier: Expand de morgan's optimization to allow move of `!` (#25930) (Armano) -5672585parser: Attach all comments to nodes (#25944) (camc314) ### 🐛 Bug Fixes -4adfb4csemantic: Validate chained continue labels (#26157) (camc314) -b874f48ecmascript: `Math.round` only exact half ties (#26150) (camc314) -a625378minifier: Coerce omitted `indexOf` search argument (#26149) (camc314) -dc7398becmascript: Trim trailing whitespace in string to number (#26148) (camc314) -243b685transformer/object-rest: Lower multiple declarators correctly (#26147) (camc314) -dc09a3aparser: Avoid panic on escaped string export names (#26146) (camc314) -e412cf2linter: Clamp invalid JS plugin locations (#26144) (camc314) -c3dedc9semantic: Skip function body bindings in parameters (#26099) (Dunqing) -e74de61transform-react: Match Babel diagnostic reporting (#26128) (Boshen) -d5163d0parser: Correctly classify unapplied pure annotations (#26084) (camc314) -8531b9blinter/plugins: Alter method for obtaining mutable `Program` when sending AST to JS plugins (#26077) (overlookmotel) -9b51658regular_expression: Allow oversized decimal escape for Annex B (#26070) (leaysgur) -c8de4dfregular_expression: Reject oversized backreferences (#26055) (camc314) ### ⚡ Performance -ac4785adiagnostics: Use fixed ANSI styles (#26130) (Boshen) -07a0793packages/codegen: Flatten output in chunks (#26109) (overlookmotel) -487427apackages/codegen: Faster string flattening (#26108) (overlookmotel) -7785583packages/codegen: Ensure indent strings are flattened (#26107) (overlookmotel) -0dd4db3packages/codegen: Store mapping positions in an `Int32Array` (#26085) (overlookmotel)
Oxc Parser
High-performance JavaScript and TypeScript parser with comprehensive language support.
Overview
This crate provides a fast, spec-compliant parser for JavaScript and TypeScript that produces a complete Abstract Syntax Tree (AST). It supports all modern language features including JSX, TSX, and the latest ECMAScript proposals.
Key Features
- Complete language support: JavaScript, TypeScript, JSX, and TSX
- Latest ECMAScript: All stable ECMAScript features plus stage 3+ proposals
- High performance: Significantly faster than traditional parsers
- Error recovery: Continues parsing after errors to provide complete AST
- Comprehensive AST: Detailed node information with accurate source positions
Architecture
Parser Design
- Recursive descent: Traditional recursive descent parser architecture
- Error recovery: Sophisticated error recovery for IDE-friendly parsing
- Memory efficient: Uses arena allocation for optimal performance
- Streaming: Processes source text in a single pass
Language Support
- JavaScript: Full ECMAScript 2024+ support
- TypeScript: Complete TypeScript syntax including decorators
- JSX/TSX: React JSX and TypeScript JSX syntax
- Proposals: Stage 3 decorators and other advancing proposals
AST Structure
The parser produces an AST that closely follows ECMAScript specifications:
- Accurate positions: Every node has precise source location information
- Complete information: Preserves all syntactic details including trivia
- Type-safe: Leverages Rust's type system for correctness
- Visitor-friendly: Designed for easy traversal and transformation
The parser is designed as the foundation for all other oxc tools, providing the high-quality AST needed for analysis, transformation, and code generation.