# ESLint
Confidence: high
Last verified: 2026-05-22
Generation: human_only


## TL;DR

ESLint is a static analysis tool for JavaScript/TypeScript that identifies problematic patterns and enforces coding standards. Created by Nicholas Zakas (2013), it is the most popular JS linter. ESLint 9 (2024) introduced flat config (`eslint.config.mjs`), replacing `.eslintrc`.

## Core Explanation

Rules can be: off (0), warn (1), error (2). Plugins extend rules (eslint-plugin-react, @typescript-eslint). Prettier handles formatting (complementary, not competing — use eslint-config-prettier to disable conflicting rules). Autofix: `eslint --fix` automatically corrects fixable issues (indentation, semicolons, unused imports).

## Further Reading

- [ESLint Documentation](https://eslint.org/docs/)