Module 09: Package Management & Ecosystem

Learning Objectives

By the end of this module, you will:

• Understand the differences between pip and npm/yarn
• Know how to manage dependencies in JavaScript projects
• Compare virtual environments with node_modules
• Navigate the JavaScript package ecosystem
• Implement security best practices for dependency management

Package Managers: pip vs npm/yarn

Python: pip and Virtual Environments

In Python, you're familiar with:

Key Differences

Dependency Management

Semantic Versioning (SemVer)

Installing and Managing Packages

Project Structure & Configuration

Python vs JavaScript Project Structure

Package Ecosystems

Finding and Evaluating Packages

Security and Best Practices

Advanced Package Management

Monorepos and Workspaces

Publishing Packages

Practical Exercises

Exercise 1: Package Migration

Convert a Python project structure to JavaScript:

Exercise 2: Dependency Audit

Best Practices Summary

Package Management Best Practices

1. Use lock files for reproducible builds
2. Regular security audits with npm audit
3. Keep dependencies updated but test thoroughly
4. Use exact versions in production
5. Minimize dependencies - avoid unnecessary packages
6. Review package quality before adding dependencies

Ecosystem Navigation Tips

1. Check package popularity and maintenance status
2. Read documentation and examples
3. Check TypeScript support if using TypeScript
4. Consider bundle size for frontend packages
5. Evaluate alternatives before choosing packages
6. Use established, well-maintained packages

Next Steps

In the next module, we'll explore testing frameworks and debugging techniques, comparing Python's unittest/pytest with JavaScript's Jest and other testing tools.

Key topics we'll cover:

• Jest vs pytest comparison
• Unit testing patterns
• Mocking and stubbing
• Integration testing
• Debugging tools and techniques

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Continue to Module 10: Testing Frameworks & Debugging →