bazel-build-optimization

# Bazel Build Optimization Production patterns for Bazel in large-scale monorepos. ## When to Use This Skill - Setting up Bazel for monorepos - Configuring remote caching/execution - Optimizing build times - Writing custom Bazel rules - Debugging build issues - Migrating to Bazel ## Core Concepts ### 1. Bazel Architecture ``` workspace/ ├── WORKSPACE.bazel # External dependencies ├── .bazelrc # Build configurations ├── .bazelversion # Bazel version ├── BUILD.bazel # Root build file ├── apps/ │ └── web/ │ └── BUILD.bazel ├── libs/ │ └── utils/ │ └── BUILD.bazel └── tools/ └── bazel/ └── rules/ ``` ### 2. Key Concepts | Concept | Description | | ----------- | -------------------------------------- | | **Target** | Buildable unit (library, binary, test) | | **Package** | Directory with BUILD file | | **Label** | Target identifier `//path/to:target` | | **Rule** | Defines how to build a target | | **Aspect** | Cross-cutting build behavior | ## Templates and detailed worked examples Full template library and detailed worked examples live in `references/details.md`. Read that file when you need the concrete templates. ## Best Practices ### Do's - **Use fine-grained targets** - Better caching - **Pin dependencies** - Reproducible builds - **Enable remote caching** - Share build artifacts - **Use visibility wisely** - Enforce architecture - **Write BUILD files per directory** - Standard convention ### Don'ts - **Don't use glob for deps** - Explicit is better - **Don't commit bazel-\* dirs** - Add to .gitignore - **Don't skip WORKSPACE setup** - Foundation of build - **Don't ignore build warnings** - Technical debt