.eslintrc.json

{
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": 2018,
    "project": [
      "./tsconfig.json"
    ]
  },
  "plugins": [
    "@typescript-eslint",
    "eslint-comments",
    "import",
    "promise"
  ],
  "extends": [
    "plugin:@typescript-eslint/eslint-recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:eslint-comments/recommended",
    "plugin:import/errors",
    "plugin:import/warnings",
    "plugin:import/typescript",
    "plugin:promise/recommended"
  ],
  "rules": {
    // Turn off for performance, TS provides same checks
    // https://github.com/typescript-eslint/typescript-eslint/blob/master/docs/getting-started/linting/FAQ.md#eslint-plugin-import
    "import/named": "off",
    "import/namespace": "off",
    "import/default": "off",
    "import/no-named-as-default-member": "off",
    "import/no-anonymous-default-export": "warn",
    "no-prototype-builtins": "off",
    "@typescript-eslint/no-inferrable-types": [
      "error",
      {
        "ignoreParameters": true
      }
    ],
    "@typescript-eslint/no-misused-promises": "error",
    "@typescript-eslint/no-unnecessary-condition": "error",
    "@typescript-eslint/no-unused-vars": [
      "error",
      {
        "ignoreRestSiblings": true
      }
    ],
    "@typescript-eslint/prefer-readonly": "warn",
    "no-console": "error",
    "@typescript-eslint/prefer-reduce-type-parameter": "warn",
    "@typescript-eslint/array-type": [
      "error",
      {
        "default": "array"
      }
    ]
  },
  "overrides": [
    {
      "parserOptions": {
        "ecmaVersion": 2018,
        "project": [
          "./tsconfig.test.json"
        ]
      },
      "files": [
        "*.spec.ts"
      ],
      "rules": {
        "@typescript-eslint/no-explicit-any": "off"
      }
    }
  ]
}