.eslintrc.json

{
  "extends": ["plugin:@typescript-eslint/recommended", "prettier", "plugin:prettier/recommended"],
  "parserOptions": {
    "sourceType": "module",
    "ecmaVersion": 2018
  },
  "env": {
    "jest": true
  },
  "globals": {
    "browser": true,
    "page": true
  },
  "plugins": ["jest"],
  "rules": {
    "array-bracket-newline": ["error", { "multiline": true }],
    "strict": ["error", "safe"],
    "block-scoped-var": "error",
    "complexity": "warn",
    "default-case": "error",
    "dot-notation": "warn",
    "eqeqeq": "error",
    "guard-for-in": "warn",
    "linebreak-style": ["warn", "unix"],
    "no-alert": "error",
    "no-case-declarations": "error",
    "no-constant-condition": "error",
    "no-div-regex": "error",
    "no-empty": "warn",
    "no-empty-pattern": "error",
    "no-implicit-coercion": "error",
    "prefer-arrow-callback": "warn",
    "no-labels": "error",
    "no-loop-func": "error",
    "no-nested-ternary": "warn",
    "no-script-url": "error",
    "no-warning-comments": "warn",
    "quote-props": ["error", "as-needed"],
    "require-yield": "error",
    "max-nested-callbacks": ["error", 4],
    "max-depth": ["error", 4],
    "require-await": "error",
    "@typescript-eslint/no-non-null-assertion": "off",
    "space-before-function-paren": [
      "error",
      {
        "anonymous": "never",
        "named": "never",
        "asyncArrow": "always"
      }
    ],
    "padding-line-between-statements": [
      "error",
      { "blankLine": "always", "prev": "*", "next": "if" },
      { "blankLine": "always", "prev": "*", "next": "function" },
      { "blankLine": "always", "prev": "*", "next": "return" }
    ],
    "no-useless-constructor": "off",
    "no-dupe-class-members": "off",
    "no-unused-expressions": "off",
    "curly": ["error", "multi-line"],
    "object-curly-spacing": ["error", "always"],
    "comma-dangle": ["error", "always-multiline"],
    "@typescript-eslint/no-useless-constructor": "error",
    "@typescript-eslint/no-unused-expressions": "error",
    "@typescript-eslint/member-delimiter-style": [
      "error",
      {
        "multiline": {
          "delimiter": "none",
          "requireLast": true
        },
        "singleline": {
          "delimiter": "semi",
          "requireLast": false
        }
      }
    ]
  },
  "overrides": [
    {
      "files": ["*.spec.ts"],
      "rules": {
        // '@typescript-eslint/ban-ts-ignore': 'off',
        "max-nested-callbacks": ["error", 10] // allow describe/it nesting
      }
    }
  ]
}