ESLint and TypeScript Configuration

ESLint catches bugs and enforces consistency in TypeScript projects. Here's how to set it up.

Best Practices#

Configuration:
✓ Use flat config for new projects
✓ Enable type-checked rules
✓ Integrate with Prettier
✓ Set up pre-commit hooks

Rules:
✓ Start with recommended, customize as needed
✓ Use consistent-type-imports
✓ Enable no-floating-promises
✓ Allow underscore for unused vars

Performance:
✓ Cache results in CI
✓ Use project references for monorepos
✓ Ignore generated files
✓ Run in parallel when possible

ESLint with TypeScript catches type-related bugs and enforces consistency. Use flat config for new projects, enable strict type checking, and integrate with Prettier for formatting. Pre-commit hooks ensure code quality before commits reach the repository.

ESLint and TypeScript Configuration

Basic Setup#

Flat Config (ESLint 9+)#

Legacy Config (.eslintrc)#

React Projects#

Essential Rules#

Custom Rule Configuration#

Disabling Rules#

Override Patterns#

Prettier Integration#

Import Sorting#

IDE Integration#

Package.json Scripts#

Pre-commit Hooks#

CI Configuration#

Monorepo Setup#

Debugging ESLint#

Best Practices#

Conclusion#

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