.eslintrc.js

module.exports = {
  root: true,
  env: {
    node: true,
    es6: true,
    jest: true,
  },
  parserOptions: {
    ecmaVersion: 8,
    project: "./tsconfig.json",
    tsconfigRootDir: "./",
  }, // to enable features such as async/await
  ignorePatterns: ["node_modules/*", ".next/*", ".out/*", "!.prettierrc.js"], // We don't want to lint generated files nor node_modules, but we want to lint .prettierrc.js (ignored by default by eslint)
  extends: ["eslint:recommended"],
  overrides: [
    // This configuration will apply only to TypeScript files
    {
      plugins: ["@typescript-eslint", "import"],
      files: ["**/*.ts", "**/*.tsx", "**/*.mdx"],
      parser: "@typescript-eslint/parser",
      settings: {
        react: { version: "detect" },
        "import/parsers": {
          "@typescript-eslint/parser": [".ts", ".tsx"],
        },
        "import/resolver": {
          typescript: {
            alwaysTryTypes: true,
          },
        },
      },
      env: {
        browser: true,
        node: true,
        es6: true,
      },
      extends: [
        "eslint:recommended",
        "plugin:@typescript-eslint/recommended", // TypeScript rules
        "plugin:@typescript-eslint/recommended-requiring-type-checking",
        "plugin:react/recommended", // React rules
        "plugin:react-hooks/recommended", // React hooks rules
        "plugin:jsx-a11y/recommended", // Accessibility rules
        "plugin:prettier/recommended", // Prettier recommended rules
      ],
      rules: {
        // We will use TypeScript's types for component props instead
        "react/prop-types": "off",

        // No need to import React when using Next.js
        "react/react-in-jsx-scope": "off",

        // This rule is not compatible with Next.js's <Link /> components
        "jsx-a11y/anchor-is-valid": "off",

        // Why would you want unused vars?
        "@typescript-eslint/no-unused-vars": ["error"],

        // I suggest this setting for requiring return types on functions only where useful
        "@typescript-eslint/explicit-function-return-type": [
          "warn",
          {
            allowExpressions: true,
            allowConciseArrowFunctionExpressionsStartingWithVoid: true,
          },
        ],
        "prettier/prettier": ["error", {}, { usePrettierrc: true }], // Includes .prettierrc.js rules
        "import/no-unresolved": "error",
      },
    },
  ],
};