Abstract Syntax Tree definitions for JavaScript, TypeScript, and JSX.
This crate provides comprehensive AST (Abstract Syntax Tree) node definitions that support the full spectrum of JavaScript and TypeScript syntax, including JSX. The AST closely follows ECMAScript specifications while providing ergonomic APIs for manipulation.
- Complete language support: JavaScript, TypeScript, JSX, and TSX
- ECMAScript compliant: AST structure follows official specifications
- Memory efficient: Designed to work with
oxc_allocatorfor fast allocation - Visitor patterns: Integrates with
oxc_ast_visitfor traversal - Type-safe: Leverages Rust's type system for correctness
The AST design differs from estree in several important ways:
- Explicit identifiers: Uses specific types like
BindingIdentifier,IdentifierReference, andIdentifierNameinstead of genericIdentifier - Precise assignment targets:
AssignmentExpression.leftusesAssignmentTargetinstead of genericPattern - Literal specialization: Replaces generic
LiteralwithBooleanLiteral,NumericLiteral,StringLiteral, etc. - Evaluation order: Field order follows ECMAScript evaluation order for consistency
The AST is designed for:
- Parse: Efficient construction during parsing
- Transform: Easy manipulation during transpilation
- Visit: Systematic traversal for analysis
- Codegen: Clean conversion back to source code
All AST nodes are allocated in an arena (oxc_allocator) for optimal performance.