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Getting Started | typescript-eslint

This page is a quick-start for ESLint's new "flat" config format to go from zero to linting with our recommended rules on your TypeScript code as quickly as possible.

First, install the required packages for ESLint, TypeScript, and our tooling:

• npm
• Yarn
• pnpm

npm install --save-dev eslint @eslint/js typescript typescript-eslint

yarn add --dev eslint @eslint/js typescript typescript-eslint

pnpm add --save-dev eslint @eslint/js typescript typescript-eslint

Next, create an eslint.config.mjs config file in the root of your project, and populate it with the following:

eslint.config.mjs

import eslint from '@eslint/js';
import tseslint from 'typescript-eslint';

export default tseslint.config(
  eslint.configs.recommended,
  tseslint.configs.recommended,
);

This code will enable our recommended configuration for linting.

• tseslint.config(...) is an optional helper function — see typescript-eslint's config(...).
• '@eslint/js' / eslint.configs.recommended turns on eslint's recommended config.
• tseslint.configs.recommended turns on our recommended config.

ESLint also provides a defineConfig() helper similar to tseslint.config(). However, there is a types incompatibility issue that causes type errors to incorrectly be reported when mixing typescript-eslint's configs and defineConfig(). For now we recommend using tseslint.config() for use with typescript-eslint's configs.

See typescript-eslint#10899 for more details.

The .mjs extension makes the file use the ES modules (ESM) format. Node interprets .js files in the CommonJS (CJS) format by default, but if you have "type": "module" in your package.json, you can also use eslint.config.js.

Open a terminal to the root of your project and run the following command:

ESLint will lint all TypeScript compatible files within the current folder, and will output the results to your terminal.

If you're having problems getting this working, please have a look at our Troubleshooting & FAQs.

We recommend you consider enabling the following two configs:

• strict: a superset of recommended that includes more opinionated rules which may also catch bugs.
• stylistic: additional rules that enforce consistent styling without significantly catching bugs or changing logic.

eslint.config.mjs

export default tseslint.config(
  eslint.configs.recommended,
  tseslint.configs.recommended,
  tseslint.configs.strict,
  tseslint.configs.stylistic,
);

You can read more about these in our shared configurations docs.

We also provide a plethora of powerful rules that utilize the power of TypeScript's type information. Visit the next page for a typed rules setup guide.

• You can read more about configuring ESLint in their documentation on configuration.
• You can read more about the rules provided by ESLint in their documentation on their rules.
• You can read more about the rules provided by typescript-eslint in our rules documentation.

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