def build_concrete_syntax_wasm()

in playground/tree-sitter/build.py [0:0]

• 30 lines of code
• 6 McCabe index (conditional complexity)

def build_concrete_syntax_wasm(repo_root: Path) -> Path:
    """Build WASM files for concrete-syntax crate."""
    concrete_syntax_dir = repo_root / "crates" / "concrete-syntax"
    pkg_web_dir = concrete_syntax_dir / "pkg-web"
    
    print("Building concrete syntax WASM package...")
    
    # Check if WASM files need to be built (simple existence check)
    wasm_files = [
        pkg_web_dir / "concrete_syntax.js",
        pkg_web_dir / "concrete_syntax_bg.wasm"
    ]
    
    if all(f.exists() for f in wasm_files):
        print("✓ Concrete syntax WASM files already exist, skipping build...")
    else:
        print("Building WASM package for web target...")
        
        # Build the WASM target first
        run_command([
            "cargo", "build", 
            "--target", "wasm32-unknown-unknown",
            "--no-default-features", 
            "--features", "wasm"
        ], cwd=concrete_syntax_dir)
        
        # Generate WASM bindings
        run_command([
            "wasm-pack", "build",
            "--target", "web",
            "--out-dir", "pkg-web", 
            "--no-default-features",
            "--features", "wasm"
        ], cwd=concrete_syntax_dir)
        
        print("✅ WASM package built successfully")
    
    # Verify files exist
    for wasm_file in wasm_files:
        if not wasm_file.exists():
            raise FileNotFoundError(f"Required WASM file not found: {wasm_file}")
    
    return pkg_web_dir