# Build & Test Workflow Optimization Guide

**Date**: 2025-01-27
**Purpose**: Guide for optimizing build and test workflows
**Status**: Complete

---

## Overview

This guide provides strategies and best practices for optimizing build and test workflows across the integrated workspace.

---

## Optimization Strategies

### 1. Build Caching

#### Turborepo Caching

**Configuration**: `turbo.json`

```json
{
  "pipeline": {
    "build": {
      "dependsOn": ["^build"],
      "outputs": ["dist/**", ".next/**", "build/**"],
      "cache": true
    }
  }
}
```

**Benefits**:
- Faster builds (skip unchanged packages)
- Reduced CI/CD time
- Lower resource usage

#### Docker Layer Caching

```dockerfile
# Cache dependencies
COPY package.json pnpm-lock.yaml ./
RUN pnpm install --frozen-lockfile

# Copy source (changes more frequently)
COPY src ./src
RUN pnpm build
```

### 2. Parallel Execution

#### Turborepo Parallel Tasks

```json
{
  "pipeline": {
    "build": {
      "dependsOn": ["^build"]
    },
    "test": {
      "dependsOn": ["build"]
    }
  }
}
```

**Benefits**:
- Build packages in parallel
- Run tests concurrently
- Faster overall execution

### 3. Incremental Builds

#### TypeScript Incremental Compilation

```json
{
  "compilerOptions": {
    "incremental": true,
    "tsBuildInfoFile": ".tsbuildinfo"
  }
}
```

**Benefits**:
- Only rebuild changed files
- Faster compilation
- Better IDE performance

### 4. Test Optimization

#### Test Filtering

```bash
# Run only changed tests
pnpm test --changed

# Run tests in parallel
pnpm test --parallel

# Use test cache
pnpm test --cache
```

#### Test Sharding

```bash
# Split tests across workers
pnpm test --shard=1/4
pnpm test --shard=2/4
pnpm test --shard=3/4
pnpm test --shard=4/4
```

---

## CI/CD Optimization

### 1. Conditional Execution

```yaml
# Only run if relevant files changed
jobs:
  test:
    if: contains(github.event.head_commit.modified, 'src/')
```

### 2. Matrix Strategy

```yaml
strategy:
  matrix:
    node-version: [18, 20]
    os: [ubuntu-latest, windows-latest]
```

### 3. Artifact Caching

```yaml
- uses: actions/cache@v3
  with:
    path: |
      node_modules
      .next/cache
    key: ${{ runner.os }}-${{ hashFiles('**/pnpm-lock.yaml') }}
```

---

## Monitoring & Metrics

### Build Metrics

Track:
- Build duration
- Cache hit rate
- Test execution time
- Resource usage

### Optimization Targets

- **Build time**: < 5 minutes (incremental)
- **Test time**: < 10 minutes (full suite)
- **Cache hit rate**: > 80%
- **Parallel efficiency**: > 70%

---

## Best Practices

### Build Optimization
- Use build caching
- Enable incremental builds
- Parallelize where possible
- Minimize dependencies

### Test Optimization
- Run tests in parallel
- Use test filtering
- Cache test results
- Optimize test setup

### CI/CD Optimization
- Conditional execution
- Artifact caching
- Parallel jobs
- Fast feedback

---

**Last Updated**: 2025-01-27