.eslintrc.json

{
  "root": true,
  "env": {
    "browser": true,
    "es6": true,
    "node": true
  },
  "settings": {
    // to support @/ path
    "import/resolver": {
      "typescript": {} // this loads <rootdir>/tsconfig.json to eslint
    },
    "react": {
      "version": "detect"
    }
  },
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "project": "./tsconfig.json", // tells parser relative path of tsconfig.json
    "ecmaFeatures": {
      "jsx": true
    },
    "ecmaVersion": 12,
    "sourceType": "module"
  },
  // all plugins (eslint-plugin-xxx) go here:
  "plugins": [
    "@typescript-eslint",
    "@next/eslint-plugin-next" // https://github.com/vercel/next.js/blob/canary/packages/eslint-plugin-next/lib/index.js
  ],

  // all configs (eslint-config-xxx) go here:
  "extends": [
    "plugin:import/typescript",
    "eslint:recommended",
    "plugin:react/recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:@typescript-eslint/recommended-requiring-type-checking", // contains rules that specifically require type information
    "plugin:@next/next/recommended",
    "next", // https://github.com/vercel/next.js/blob/canary/packages/eslint-config-next/package.json
    "next/core-web-vitals",
    "prettier"
  ],
  "rules": {
    "no-unused-vars": "off",
    "@typescript-eslint/no-unused-vars": ["error"],
    "@typescript-eslint/no-misused-promises": "off",
    "@typescript-eslint/no-floating-promises": "off",
    "jsx-a11y/alt-text": "error"
  }
}