caching ci

Author: “Kirti

.github/workflows/cache-ci.yml

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+name: CI with Caching
+
+on:
+  push:
+    branches: [ master, feature/github-actions-practice ]
+  pull_request:
+    branches: [ master ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    
+    - name: Setup Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '22'
+        cache: 'npm'  # ✨ Built-in npm caching!
+    
+    - name: Cache node_modules
+      uses: actions/cache@v4
+      with:
+        path: ~/.npm
+        key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-node-
+    
+    - name: Install dependencies
+      run: npm ci
+    
+    - name: Run tests
+      run: npm test -- --passWithNoTests --watchAll=false --coverage
+    
+    - name: Build project
+      run: npm run build
+    
+    - name: Upload coverage report
+      uses: actions/upload-artifact@v4
+      with:
+        name: coverage-report
+        path: coverage/
+        retention-days: 7

Caching Dependencies.md

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+Next, we'll learn how to cache node_modules to make builds much faster!

Matric.md

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 Example 2: Matrix Build - Test on Multiple Node Versions
 - Run tests on Node 18, 20, and 22 simultaneously
 - See 3 jobs running in parallel
-- Understand matrix strategy
+- Understand matrix strategy
+
+# Matrix Strategy creates multiple jobs from one definition:
+
+- node-version: [18, 20, 22] → Creates 3 jobs
+- All run in parallel (at the same time)
+- Uses ${{ matrix.node-version }} to reference the current value
+
+Real-world use cases:
+
+- Test on multiple Node versions (like we just did)
+- Test on multiple OS (Ubuntu, Windows, macOS)
+- Test with different dependency versions
+- Test different configurations
+