Next.js, Javascript and ESLint configuration.

Install ESLint

npm i eslint  prettier eslint-plugin-react eslint-plugin-react-hooks eslint-config-prettier eslint-plugin-prettier eslint-plugin-jsx-a11y eslint-plugin-simple-import-sort

// eslintrc.js
module.exports = {
  root: true, //
  parserOptions: {
    ecmaVersion: 2020,
    sourceType: "module",
    ecmaFeatures: {
      jsx: true,
    },
  },
  settings: {
    react: {
      version: "detect",
    },
  },
  env: {
    browser: true,
    amd: true,
    node: true,
  },
  extends: [
    "eslint:recommended",
    "plugin:react/recommended",
    "plugin:react-hooks/recommended",
    "plugin:jsx-a11y/recommended",
    "plugin:prettier/recommended",
  ],
  plugins: ["simple-import-sort"],
  rules: {
    "prettier/prettier": ["error", {}, { usePrettierrc: true }],
    "react/react-in-jsx-scope": "off",
    "react/prop-types": "off",
    "simple-import-sort/imports": "error",
    "simple-import-sort/exports": "error",
    "jsx-a11y/anchor-is-valid": [
      "error",
      {
        components: ["Link"],
        specialLink: ["hrefLeft", "hrefRight"],
        aspects: ["invalidHref", "preferButton"],
      },
    ],
  },
};

// .prettierrc
{
  "semi": true,
  "tabWidth": 2,
  "printWidth": 100,
  "singleQuote": false,
  "trailingComma": "all",
  "jsxBracketSameLine": true,
  "endOfLine": "auto"
}

// package.json

  "scripts": {
    "dev": "next dev",
    "build": "next build",
    "start": "next start",
    "lint": "eslint --fix .",
    "format": "prettier --write './**/*.{js,jsx,ts,tsx,css,md,json}' --config ./.prettierrc"
  },