CI/CD for Angular

2.1 Key Definitions

• **Continuous Integration (CI)**: The practice of automatically testing and integrating code changes into a shared repository several times a day.
• **Continuous Delivery (CD)**: The practice of ensuring that the software can be reliably released at any time.
• **Continuous Deployment**: A step beyond continuous delivery where every change that passes automated tests is automatically deployed to production.

3.1 Prerequisites

• Node.js installed on your machine.
• An Angular application created using Angular CLI.
• A version control system (e.g., Git).
• A CI/CD service (e.g., GitHub Actions, GitLab CI, CircleCI).

3.2 Step-by-Step Setup

1. Configure Version Control: Ensure your Angular app is in a Git repository.
2. Create a CI/CD Configuration File: Depending on your CI/CD service, create a file (e.g., `.github/workflows/main.yml` for GitHub Actions).

   name: CI/CD Pipeline
   on:
     push:
       branches:
         - main
   jobs:
     build:
       runs-on: ubuntu-latest
       steps:
         - name: Checkout code
           uses: actions/checkout@v2
         - name: Install Node.js
           uses: actions/setup-node@v2
           with:
             node-version: '14'
         - name: Install dependencies
           run: npm install
         - name: Run tests
           run: npm test
         - name: Build the project
           run: npm run build
         - name: Deploy
           run: npm run deploy
   

3. Implement Testing: Use Angular's built-in testing capabilities. Ensure your tests are passing in your CI pipeline.
4. Deploy Automatically: Configure your CI/CD tool to deploy your application after successful builds.

4.1 CI/CD Best Practices

• Run tests on every commit to catch issues early.
• Ensure your pipeline is fast. Optimize build times.
• Use environment variables to manage configuration.
• Implement rollback strategies in case of failed deployments.
• Monitor your application after deployment for errors and performance issues.