ESLint Best Practices

Provides guidance for configuring ESLint using the modern flat config format (eslint.config.js), selecting and tuning rules, managing plugins, and integrating linting into CI/CD workflows.

Core Concepts

• Flat config (eslint.config.js) is the current standard. The legacy .eslintrc.* format is deprecated as of ESLint v9.
• Configuration objects are merged in order — later objects override earlier ones for the same rule.
• Rule severities: "off" (0) | "warn" (1) | "error" (2).
• Plugins extend ESLint with additional rules, processors, and languages. Reference as pluginName/ruleName.

Setup

Quick initialization (recommended)

npm init @eslint/config@latest