.eslintrc.json

{
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": 12,
    "sourceType": "module",
    "project": "./tsconfig.json"
  },
  "ignorePatterns": ["node_modules", "__tests__"],
  "plugins": ["@typescript-eslint", "import", "unused-imports"],
  "extends": [
    "next/core-web-vitals",
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:@typescript-eslint/recommended-requiring-type-checking",
    "prettier"
  ],
  "rules": {
    // @typescript-eslint
    "@typescript-eslint/explicit-function-return-type": "warn",
    "@typescript-eslint/no-explicit-any": "error",
    "@typescript-eslint/no-non-null-assertion": "error",
    "@typescript-eslint/no-unused-vars": [
      "error",
      { "argsIgnorePattern": "^_" }
    ],
    "@typescript-eslint/typedef": "error",

    // import
    "import/extensions": ["error", { "extensions": [".ts", ".tsx"] }],
    "import/no-extraneous-dependencies": [
      "error",
      {
        "devDependencies": true,
        "optionalDependencies": false,
        "peerDependencies": false
      }
    ],

    // unused-imports
    "unused-imports/no-unused-imports": "error",

    // eslint
    "camelcase": "warn",
    "dot-notation": "warn",
    "eol-last": "warn",
    "max-len": [
      "warn",
      {
        "code": 120,
        "tabWidth": 2,
        "comments": 120,
        "ignoreComments": false,
        "ignoreTrailingComments": true,
        "ignoreUrls": true,
        "ignoreStrings": true,
        "ignoreTemplateLiterals": true,
        "ignoreRegExpLiterals": true
      }
    ],
    "no-var": "warn",
    "no-await-in-loop": "error",
    "no-return-await": "off",
    "no-console": "warn",
    "no-unused-vars": ["error", { "argsIgnorePattern": "^_" }],
    "prefer-const": "warn",
    "require-await": "warn",
    "sort-imports": "off",
    "sort-keys": "off",
    "spaced-comment": "warn"
  }
}