eslint-9
ESLint 9 Flat Config Patterns
Overview
ESLint 9 uses flat config (eslint.config.js) as the default. The legacy .eslintrc.* format is deprecated.
Key differences from .eslintrc:
- Single config file, explicit imports — no magic
extendsstrings. - Config is an exported array of config objects, applied in order.
- Plugins are imported directly, not referenced by string name.
- Glob patterns in
filesreplace the oldoverridessystem.
Basic Setup
JavaScript
// eslint.config.js
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