Validate Build

Validate that the project builds successfully. Run BEFORE commits to catch build failures early.

Phase 1: Detect Build System

Identify the project's build system:

# Check for common build configurations
ls package.json Makefile setup.py pyproject.toml go.mod Cargo.toml CMakeLists.txt 2>/dev/null

Phase 2: Run Build Commands

Based on detected system:

Node.js/TypeScript

npm run build 2>&1 || yarn build 2>&1 || pnpm build 2>&1 || bun run build 2>&1

Python

python -m py_compile **/*.py
# or for packages:
pip install -e . --dry-run

Go

go build ./...

Rust

cargo build

Phase 3: Verify Build Artifacts

Check that expected outputs exist:

• dist/ or build/ directory for JS/TS
• Compiled binaries for Go/Rust
• No missing dependencies

# Example for Node.js
ls -la dist/ build/ 2>/dev/null

Phase 4: Check for Warnings

Parse build output for:

• Deprecation warnings
• Unused variables/imports
• Performance warnings
• Type coercion warnings

Output Format

## Build Validation: [PASS/FAIL]

### Build Command
[command used]

### Result
- Exit code: [0/non-zero]
- Duration: [time if available]

### Artifacts
- [x] Output directory created
- [x] Expected files present
- [ ] Source maps generated (if applicable)

### Warnings
- [List any build warnings]

### Errors (if failed)
- [Parse and list specific errors]
- [Suggested fixes for each]

Auto-Fix Suggestions

If build fails, suggest:

1. Missing dependency installation commands
2. Type errors with file:line locations
3. Syntax errors with context
4. Configuration issues

Usage

Copy to your project:

cp templates/subagents/validate-build.md .claude/commands/

Invoke with: /project:validate-build