ESLint and Prettier: Code Quality and Formatting

What you'll learn

• Explain what ESLint and Prettier each do and how they differ.
• Write an ESLint flat config and a Prettier configuration.
• Integrate the two tools without rule conflicts, with editor support.
• Enforce checks with Husky, lint-staged and CI.
• Share configs, lint TypeScript and migrate from legacy .eslintrc files.

Syllabus

Module 1: Getting Started

1. Introduction to Code Quality Tools

Module 2: Foundation & Setup

1. Installation & Project Setup
2. ESLint Flat Config Basics
3. Prettier Configuration
4. Integrating ESLint and Prettier

Module 3: Core Concepts

1. Understanding ESLint Rules
2. Popular ESLint Plugins

Module 4: Configuration Deep Dive

1. Targeting Files, Globals & Overrides
2. Prettier Advanced Options

Module 5: Code Quality & Best Practices

1. Common Code Quality Issues
2. Formatting Standards & Team Consistency

Module 6: Practical Applications

1. Fixing Issues Automatically
2. Integration with Editor / IDE

Module 7: Advanced Quality Control

1. Pre-commit Hooks & Husky
2. Custom ESLint Rules

Module 8: Integration & CI/CD

1. CI/CD Pipeline Integration
2. Team Setup & Shared Configurations
3. Reporting & Performance
4. Linting TypeScript with typescript-eslint
5. Alternatives: Biome and oxlint

Module 9: Advanced Topics

1. Migrating Between ESLint Versions
2. Debugging Linting Issues

Module 10: Final Review & Mastery

1. Best Practices & Anti-patterns
2. Real-world Project Examples
3. Interview Questions & Cheat Sheet
4. Troubleshooting & Common Gotchas
5. Summary & Next Steps