.eslintrc.json

{
  "extends": ["eslint:recommended", "plugin:import/recommended", "plugin:jest/recommended"],
  "plugins": ["import"],
  "rules": {
    "no-undef": "off",
    "no-unused-vars": [
      "off",
      {
        "ignoreRestSiblings": true
      }
    ],
    "import/no-duplicates": [
      "error",
      {
        "considerQueryString": true
      }
    ],
    "import/named": "off",
    "import/first": "error",
    "import/no-namespace": "error",
    "import/extensions": [
      "error",
      "always",
      {
        "js": "never",
        "jsx": "never",
        "ts": "never",
        "tsx": "never"
      }
    ],
    "import/order": [
      "error",
      {
        "groups": [
          ["internal", "external", "builtin"],
          ["parent", "sibling", "index"]
        ],
        "alphabetize": {
          "order": "asc",
          "caseInsensitive": true
        }
      }
    ],
    "import/newline-after-import": "error",
    "import/no-anonymous-default-export": "error",
    "import/no-dynamic-require": "error",
    "import/no-self-import": "error",
    "import/no-useless-path-segments": [
      "error",
      {
        "noUselessIndex": true
      }
    ],
    "import/no-relative-packages": "error",
    "import/no-unused-modules": "error",
    "import/no-deprecated": "error",
    "import/no-commonjs": "error",
    "import/no-amd": "error",
    "import/no-mutable-exports": "error",
    "import/no-unassigned-import": "error",
    "jest/expect-expect": "off"
  },
  "settings": {
    "import/external-module-folders": ["node_modules", "node_modules/@types"],
    "import/parsers": {
      "@typescript-eslint/parser": [".ts", ".tsx"]
    },
    "import/resolver": {
      "typescript": {
        "alwaysTryTypes": true,
        "project": "<root>/tsconfig.json"
      },
      "node": true
    }
  },
  "overrides": [
    {
      "files": ["src/**/*.ts", "src/**/*.tsx"],
      "extends": [
        "eslint:recommended",
        "plugin:@typescript-eslint/eslint-recommended",
        "plugin:@typescript-eslint/recommended",
        "plugin:import/recommended",
        "plugin:jest/recommended"
      ],
      "plugins": ["import", "@typescript-eslint"],
      "rules": {
        "@typescript-eslint/explicit-module-boundary-types": "off",
        "@typescript-eslint/no-unused-vars": [
          "error",
          {
            "ignoreRestSiblings": true
          }
        ],
        "@typescript-eslint/switch-exhaustiveness-check": "error",
        "@typescript-eslint/no-empty-function": "off"
      },
      "parserOptions": {
        "parser": "@typescript-eslint/parser",
        "ecmaVersion": 2018,
        "sourceType": "module",
        "project": "./tsconfig.json"
      }
    }
  ]
}