Zero to linting and formatting

Start by installing ESLint:

npm install -D eslint @eslint/js typescript typescript-eslint

Optionally install prettier for formatting:

npm install -D eslint-plugin-prettier eslint-config-prettier

Optionally install jiti for having the config file in TypeScript:

npm install -D jiti

Then configure them:

eslint.config.ts

import prettier from "eslint-plugin-prettier/recommended";
import eslint from "@eslint/js";
import tseslint from "typescript-eslint";

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

:::warn Unconfigured ESLint will run against all valid source files it can find.

You probably have a build folder or some files to ignore, to ignore files, add them to the flat config like:

export default tseslint.config(
    /* ..., */
    {
        ignores: ["node_modules", "dist"],
    }
)

:::

See Getting Started | typescript-eslint

See eslint-plugin-prettier - npm