Oxc Minifier

Next-generation JavaScript/TypeScript minifier achieving best-in-class compression.

Inspiration

• Closure Compiler: Advanced size optimizations
• Terser/UglifyJS: Comprehensive battle-tested transforms
• esbuild: Efficient algorithms and architecture
• SWC: Modern Rust performance

Key Features

• Maximum compression through exhaustive optimizations
• 100% correctness with comprehensive testing
• Fixed-point iteration for optimal size
• Arena allocation for performance

Current Performance

See tasks/minsize for compression benchmarks.

• Matching/beating esbuild on many libraries
• Full test262, Babel, TypeScript conformance

Usage

use oxc_minifier::{Minifier, MinifierOptions};

let options = MinifierOptions::default();
let minifier = Minifier::new(options);
let result = minifier.minify(&mut program);

Testing Infrastructure

• just minsize - Track compression benchmarks
• cargo coverage - Conformance tests (test262, Babel, TypeScript)
• tasks/e2e - Real-world E2E testing

Development

• just test - Run all tests
• cargo run -p oxc_minifier --example minifier - Try the minifier

Key Dependencies

• oxc_ecmascript - ECMAScript operations and constant evaluation
• oxc_semantic - Scope and symbol analysis
• oxc_mangler - Variable renaming

Documentation

• Architecture - Design and components
• Optimizations - Complete optimization catalog
• Assumptions - Code assumptions for optimization
• Correctness - Testing and validation
• Roadmap - Development plan
• Claude Guide - AI assistant reference