eslint-config

Flat config is ESLint's modern configuration format. Set up an eslint.config.js file with TypeScript parser options and recommended rules for your project, replacing legacy .eslintrc formats with a flatter, more maintainable structure.

Yes, flat config supports file-specific rule overrides. You can scope rules to test directories, script folders, or other file patterns within a single configuration, applying stricter or relaxed rules where appropriate.

Integrate TypeScript by configuring the ESLint TypeScript parser, enabling language service features, and applying TypeScript-specific recommended rules in your flat config. Project references can be used to optimize type checking across your codebase.

Migration to flat config is recommended for modern projects. Flat config offers cleaner syntax, better scoping, and improved maintainability. The migration process involves converting your existing .eslintrc or config files to eslint.config.js format.

Use flat config to define naming-convention rules and custom lint policies that apply project-wide or to specific scopes. Run lint tasks to enforce these policies consistently during initial setup and ongoing development.

Flat config handles project references effectively, but complex monorepo setups may require careful scoping. Be aware that overrides must be explicit per file pattern, and large rulesets can impact linting performance.