zts

A high-performance JavaScript/TypeScript transpiler written in Zig.

Status: Early development (Phase 1 - Lexer)

Goals

• Fast: SIMD-accelerated lexer, arena-based memory, cache-friendly AST
• Correct: Validated against Test262 test suite
• Compatible: Handles all TypeScript syntax (type stripping + code transforms)
• Small: Minimal binary size, WASM-friendly

Build

# Prerequisites: Zig 0.14.0 (use mise for version management)
mise install

# Build
zig build

# Run
zig build run -- src/index.ts

# Test
zig build test

Roadmap

See ROADMAP.md for detailed implementation plan.

Architecture

See CLAUDE.md for architecture decisions and references.

Design Decisions

See DECISIONS.md for pending and resolved decisions.

References

• Bun JS Parser (Zig, MIT)
• oxc (Rust, MIT)
• SWC (Rust, Apache-2.0)
• esbuild (Go, MIT)
• Test262

License

MIT