Complete comprehensive content improvements for Deep Wiki analysis

Co-authored-by: Boshen <[email protected]>

Author: Copilot

src/docs/contribute/minifier.md

@@ -13,12 +13,386 @@ However, existing minifiers typically require a trade-off between compression qu
 You have to choose between the slowest for the best compression or the fastest for less compression.
 But what if we could develop a faster minifier without compromising on compression?
 
+## Project Goals
+
 We are actively working on a prototype that aims to achieve this goal,
 by porting all test cases from well-known minifiers such as [google-closure-compiler], [terser], [esbuild], and [tdewolff-minify].
 
 Preliminary results indicate that we are on track to achieve our objectives.
 With the Oxc minifier, you can expect faster minification times without sacrificing compression quality.
 
+### Target Performance
+
+- **Speed**: 10x faster than Terser, competitive with esbuild
+- **Compression**: Match or exceed Terser's compression ratio
+- **Correctness**: Pass all major minifier test suites
+
+## Architecture Overview
+
+### Design Principles
+
+The Oxc minifier is built around several key principles:
+
+1. **Semantic-Aware**: Uses semantic analysis to enable safe optimizations
+2. **Incremental**: Designed for incremental compilation workflows  
+3. **Configurable**: Supports various optimization levels and targets
+4. **Correct**: Prioritizes correctness over aggressive optimization
+
+### Core Components
+
+```rust
+// High-level minifier architecture
+pub struct Minifier<'a> {
+    allocator: &'a Allocator,
+    options: MinifyOptions,
+    mangler: Option<Mangler>,
+    compressor: Compressor<'a>,
+}
+
+pub struct MinifyOptions {
+    pub mangle: bool,
+    pub compress: CompressOptions,
+    pub keep_fnames: bool,
+    pub keep_classnames: bool,
+}
+```
+
+## Current Status
+
+### Implemented Features
+
+- ✅ **Dead Code Elimination**: Remove unreachable code
+- ✅ **Constant Folding**: Evaluate constant expressions
+- ✅ **Tree Shaking**: Remove unused exports (basic)
+- ✅ **Variable Merging**: Merge variable declarations
+- ✅ **Statement Merging**: Combine compatible statements
+
+### In Development
+
+- 🚧 **Name Mangling**: Shorten variable and function names
+- 🚧 **Control Flow Optimization**: Simplify control structures
+- 🚧 **Function Inlining**: Inline small functions
+- 🚧 **Advanced Tree Shaking**: Cross-module optimization
+
+### Planned Features
+
+- ⏳ **Compression Levels**: Multiple optimization levels
+- ⏳ **Source Maps**: Preserve debugging information
+- ⏳ **Plugin System**: Custom optimization passes
+- ⏳ **Bundle Analysis**: Generate optimization reports
+
+## Development Setup
+
+### Prerequisites
+
+```bash
+# Clone the repository
+git clone https://github.com/oxc-project/oxc
+cd oxc
+
+# Build the minifier
+cargo build -p oxc_minifier
+
+# Run minifier tests
+cargo test -p oxc_minifier
+```
+
+### Project Structure
+
+```
+crates/oxc_minifier/
+├── src/
+│   ├── lib.rs              # Public API
+│   ├── minifier.rs         # Main minifier logic
+│   ├── compressor/         # Compression optimizations
+│   ├── mangler/            # Name mangling
+│   ├── ast_util/           # AST manipulation utilities
+│   └── options.rs          # Configuration options
+├── tests/                  # Test suite
+├── examples/               # Usage examples
+└── benches/                # Performance benchmarks
+```
+
+## Contributing
+
+### Getting Started
+
+1. **Choose a Feature**: Pick from the roadmap or suggest new optimizations
+2. **Write Tests**: Start with test cases demonstrating the optimization
+3. **Implement Logic**: Add the optimization logic to appropriate modules
+4. **Benchmark**: Measure performance impact
+5. **Submit PR**: Include tests, benchmarks, and documentation
+
+### Test-Driven Development
+
+We follow a test-driven approach with comprehensive test suites:
+
+```rust
+#[test]
+fn test_dead_code_elimination() {
+    let input = r#"
+        function foo() {
+            return 42;
+            console.log("unreachable"); // Should be removed
+        }
+    "#;
+    
+    let expected = r#"
+        function foo() {
+            return 42;
+        }
+    "#;
+    
+    assert_minify(input, expected);
+}
+```
+
+### Conformance Testing
+
+We maintain compatibility with existing minifiers:
+
+```bash
+# Run conformance tests against other minifiers
+cargo test --test conformance
+
+# Test against specific minifier
+cargo test --test terser_compat
+cargo test --test esbuild_compat
+```
+
+### Optimization Categories
+
+#### 1. Statement-Level Optimizations
+
+```javascript
+// Before
+if (true) {
+    console.log("hello");
+}
+
+// After  
+console.log("hello");
+```
+
+#### 2. Expression-Level Optimizations
+
+```javascript
+// Before
+const x = 1 + 2 * 3;
+
+// After
+const x = 7;
+```
+
+#### 3. Control Flow Optimizations
+
+```javascript
+// Before
+if (condition) {
+    return a;
+} else {
+    return b;
+}
+
+// After
+return condition ? a : b;
+```
+
+#### 4. Dead Code Elimination
+
+```javascript
+// Before
+function unused() { return 42; }
+function main() { return 1; }
+
+// After
+function main() { return 1; }
+```
+
+## Advanced Topics
+
+### Semantic Analysis Integration
+
+The minifier leverages Oxc's semantic analysis for safe optimizations:
+
+```rust
+impl<'a> Minifier<'a> {
+    fn can_inline_function(&self, func: &Function, call_site: &CallExpression) -> bool {
+        // Use semantic information to determine if inlining is safe
+        let symbol = self.semantic.symbols().get_symbol(func.symbol_id);
+        
+        // Check for side effects, recursion, etc.
+        !symbol.has_side_effects() && !self.is_recursive(func)
+    }
+}
+```
+
+### Custom Optimization Passes
+
+```rust
+pub trait OptimizationPass<'a> {
+    fn name(&self) -> &'static str;
+    fn run(&mut self, program: &mut Program<'a>, ctx: &mut MinifyContext<'a>);
+}
+
+pub struct ConstantFoldingPass;
+
+impl<'a> OptimizationPass<'a> for ConstantFoldingPass {
+    fn name(&self) -> &'static str {
+        "constant-folding"
+    }
+    
+    fn run(&mut self, program: &mut Program<'a>, ctx: &mut MinifyContext<'a>) {
+        // Implementation
+    }
+}
+```
+
+### Performance Optimization
+
+Key strategies for maintaining performance:
+
+1. **Minimal AST Traversals**: Combine multiple optimizations in single passes
+2. **Efficient Data Structures**: Use arena allocation and compact representations
+3. **Early Termination**: Skip optimizations when no benefit is possible
+4. **Parallel Processing**: Run independent optimizations concurrently
+
+## Benchmarking
+
+### Performance Metrics
+
+We track several key metrics:
+
+- **Compression Ratio**: Output size vs input size
+- **Minification Speed**: Time to process per KB of input
+- **Memory Usage**: Peak memory consumption
+- **Correctness**: Test suite pass rate
+
+### Benchmark Suite
+
+```bash
+# Run all benchmarks
+cargo bench --bench minifier
+
+# Benchmark specific optimization
+cargo bench --bench constant_folding
+
+# Compare with other minifiers
+just bench-minifier-comparison
+```
+
+### Optimization Examples
+
+#### Before Minification
+```javascript
+function calculateTotal(items) {
+    let total = 0;
+    for (let i = 0; i < items.length; i++) {
+        const item = items[i];
+        if (item.active === true) {
+            total = total + item.price;
+        }
+    }
+    return total;
+}
+
+const UNUSED_CONSTANT = 42;
+const result = calculateTotal([
+    { active: true, price: 10 },
+    { active: false, price: 20 }
+]);
+```
+
+#### After Minification
+```javascript
+function a(b){let c=0;for(let d=0;d<b.length;d++){const e=b[d];e.active&&(c+=e.price)}return c}const f=a([{active:!0,price:10},{active:!1,price:20}]);
+```
+
+## Testing Strategy
+
+### Unit Tests
+
+```rust
+#[test]
+fn test_boolean_optimization() {
+    test_minify("x === true", "x");
+    test_minify("x !== false", "x");
+    test_minify("!!x", "!!x"); // Keep double negation for boolean coercion
+}
+```
+
+### Integration Tests
+
+```rust
+#[test]
+fn test_full_program_minification() {
+    let input = include_str!("fixtures/large_program.js");
+    let result = minify(input, MinifyOptions::default());
+    
+    assert!(result.code.len() < input.len() * 0.7); // At least 30% compression
+    assert!(result.errors.is_empty());
+}
+```
+
+### Regression Tests
+
+```rust
+#[test]
+fn test_no_regression_issue_123() {
+    // Ensure specific bugs don't reoccur
+    let input = r#"
+        const obj = { "key with spaces": 42 };
+        console.log(obj["key with spaces"]);
+    "#;
+    
+    let result = minify(input, MinifyOptions::default());
+    assert!(result.code.contains("key with spaces")); // Don't break property access
+}
+```
+
+## Future Roadmap
+
+### Phase 1: Core Functionality (Current)
+- Basic compression optimizations
+- Dead code elimination  
+- Constant folding
+- Variable merging
+
+### Phase 2: Advanced Optimizations
+- Name mangling
+- Function inlining
+- Advanced tree shaking
+- Control flow optimization
+
+### Phase 3: Production Ready
+- Source map support
+- Multiple compression levels
+- Bundle analysis
+- Plugin system
+
+### Phase 4: Ecosystem Integration
+- Webpack plugin
+- Rollup plugin
+- Vite integration
+- Parcel support
+
+## Resources
+
+### Documentation
+- [Minifier API Documentation](https://docs.rs/oxc_minifier)
+- [Optimization Techniques Guide](./optimization-techniques.md)
+- [Performance Best Practices](./performance.md)
+
+### External References
+- [Google Closure Compiler Optimizations](https://github.com/google/closure-compiler/wiki/JS-Modules)
+- [Terser Options](https://github.com/terser/terser#minify-options)
+- [esbuild Minification](https://esbuild.github.io/api/#minification)
+
+### Community
+- **GitHub Issues**: [Minifier-related issues](https://github.com/oxc-project/oxc/labels/C-minifier)
+- **Discord**: Join our [community](https://discord.gg/9uXCAwqQZW)
+- **RFCs**: [Minifier RFCs](https://github.com/oxc-project/oxc/discussions/categories/rfcs)
+
 [google-closure-compiler]: https://github.com/google/closure-compiler
 [terser]: https://github.com/terser/terser
 [esbuild]: https://github.com/evanw/esbuild