refactor(minifier): change AST in-place instead of returning Option<Expression>

Author: Boshen

AGENTS.md

@@ -1,11 +1,13 @@
 # AGENTS.md - AI Assistant Guide for Oxc
 
 Oxc is a high-performance JavaScript/TypeScript toolchain written in Rust containing:
+
 - Parser (JS/TS with AST), Linter (oxlint), Formatter, Transformer, Minifier
 
 ## Repository Structure
 
 Rust workspace with key directories:
+
 - `crates/` - Core functionality (start here when exploring)
 - `apps/` - Application binaries (oxlint)
 - `napi/` - Node.js bindings
@@ -16,8 +18,9 @@ Rust workspace with key directories:
 Avoid editing `generated` subdirectories.
 
 ### Core Crates
+
 - `oxc_parser` - JS/TS parser
-- `oxc_ast` - AST definitions/utilities  
+- `oxc_ast` - AST definitions/utilities
 - `oxc_linter` - Linting engine/rules
 - `oxc_semantic` - Semantic analysis/symbols
 - `oxc_transformer` - Code transformation
@@ -32,11 +35,13 @@ Avoid editing `generated` subdirectories.
 Prerequisites: Rust (MSRV: 1.87.0), Node.js, pnpm, just
 
 **Setup Notes:**
+
 - `just init` has already been run, all tools (`cargo-insta`, `typos-cli`, `cargo-shear`, `dprint`) are already installed, do not run `just init`.
 - Rust and `cargo` components `clippy`, `rust-docs` and `rustfmt` has already been installed, do not install them.
 - Always run `just ready` as the last step after code has been committed to the repository.
 
 Key commands (tools already installed):
+
 ```bash
 just ready     # Run all checks (use after commits)
 just fmt       # Format code (run after modifications)
@@ -53,26 +58,30 @@ pnpm test      # Node.js tests
 ## Examples
 
 Most crates have examples in their `examples/` directories:
+
 ```bash
 cargo run -p <crate_name> --example <example_name> [filename]
 ```
 
 Key examples:
+
 - `oxc_parser --example parser` - Basic parsing/AST
-- `oxc_linter --example linter` - Linting demo  
+- `oxc_linter --example linter` - Linting demo
 - `oxc_semantic --example semantic` - Semantic analysis
 - `oxc_transformer --example transformer` - Code transformation
 - `oxc --example compiler --features="full"` - Full pipeline
 
 ## Code Navigation
 
 ### Key Locations
+
 - AST: Start with `oxc_ast`, use `oxc_ast_visit` for traversal
 - Linting rules: `crates/oxc_linter/src/rules/` (visitor pattern)
 - Parser: `crates/oxc_parser/src/lib.rs`, lexer in `src/lexer/`
 - Tests: Co-located with source, integration in `tests/`, uses `insta` for snapshots
 
 ### Conventions
+
 - Use `oxc_allocator` for memory management
 - Follow rustfmt config in `.rustfmt.toml`
 - Use `oxc_diagnostics` for errors with source locations
@@ -81,28 +90,33 @@ Key examples:
 ## Common Tasks
 
 ### Adding Linting Rule
+
 1. Create module in `crates/oxc_linter/src/rules/`
 2. Implement using visitor pattern
 3. Add tests in same module
 4. Register in appropriate category
 
 ### Parser Changes
+
 1. Research and test grammar changes thoroughly
 2. Update AST definitions in `oxc_ast` if needed
 3. Ensure existing tests pass
 4. Add tests for new features
 
 ### Working with Transformations
+
 1. Understand AST structure first
 2. Use visitor pattern for traversal
 3. Handle node ownership/allocator carefully
 4. Test with various input patterns
 
 ## Notes
+
 - Rapidly evolving project - APIs may change
 - Performance is critical for all changes
 - Maintain JS/TS standard compatibility
 - Breaking changes need documentation and discussion
 
 ---
+
 For human contributors see `CONTRIBUTING.md` and [oxc.rs](https://oxc.rs)