.eslintrc

{
  "root": true,
  "env": {
    "browser": true,
    "es6": true,
    "node": true,
    "jest": true
  },
  "settings": {
    "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": [
    "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",
    "plugin:testing-library/react",
    "plugin:jest-dom/recommended",
    "prettier"
  ],
  "rules": {
    "indent": ["error", 2],
    "quotes": ["error", "single", { "allowTemplateLiterals": true }],
    "semi": ["error", "never"],
    "func-style": 0,
    "max-len": 0,
    "no-magic-numbers": 0,
    "max-lines-per-function": 0,
    "space-before-function-paren": [
      "error",
      {
        "anonymous": "never",
        "named": "never",
        "asyncArrow": "always"
      }
    ],
    "function-call-argument-newline": 0,
    "padded-blocks": 0,
    "padding-line-between-statements": [
      "error",
      { "blankLine": "always", "prev": "*", "next": "return" },
      { "blankLine": "always", "prev": ["const", "let", "var"], "next": "*" },
      {
        "blankLine": "any",
        "prev": ["const", "let", "var"],
        "next": ["const", "let", "var"]
      }
    ],
    "object-curly-spacing": ["error", "always"],
    "one-var": ["error", "never"],
    "quote-props": 0,
    "@typescript-eslint/no-unsafe-assignment": "off",
    "@typescript-eslint/no-misused-promises": [
      2,
      {
        "checksVoidReturn": {
          "attributes": false
        }
      }
    ]
  }
}