A pluggable and configurable linter tool for identifying and reporting on patterns in JavaScript. Maintain your code quality with ease.

ESLint's platform is a popular linting tool for JavaScript, offering insights into code quality, code style conventions, and static code analysis. Through documentation, tutorials, and configuration guides, ESLint offers insights into identifying and fixing common errors and code smells in JavaScript codebases. Developers can learn about ESLint rules, plugins, and integrations to maintain clean and consistent code across projects.

ESLint

ESLint has partnered with Codemod to automate migrations between major ESLint versions. Official codemods are now available for v8-to-v9 and v9-to-v10 upgrades, hosted in the eslint/codemods GitHub repo and the Codemod Registry. The v8-to-v9 tooling covers config file migration (extracting eslintConfig from package.json, converting env to globals, handling rule option changes) and custom rule migration (updating deprecated context methods, converting function-style rules to object format). The v9-to-v10 recipe bundles four codemods covering config, custom rules, RuleTester, and Linter API changes. Some complex cases still require manual review, and TODO comments are left in migrated files to flag those spots.

Automating ESLint migrations with Codemod