.eslintrc.json

{
  "root": true,
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": 2018,
    "sourceType": "module",
    "optionalChaining": true
  },
  "plugins": ["@typescript-eslint", "import", "prettier"],
  "extends": [
    "plugin:@typescript-eslint/recommended",
    "plugin:import/typescript",
    "plugin:prettier/recommended"
  ],
  "rules": {
    "prettier/prettier": "error",
    "@typescript-eslint/explicit-module-boundary-types": "off",
    "@typescript-eslint/semi": "warn",
    "no-undef": "error",
    "curly": "warn",
    "eqeqeq": "warn",
    "no-throw-literal": "warn",
    "semi": "off",
    "newline-before-return": "error",
    "lines-between-class-members": ["error", "always"],
    "import/order": [
      "error",
      {
        "newlines-between": "always",
        "groups": [
          ["builtin", "external"],
          ["internal", "sibling", "parent", "index"],
          "unknown"
        ]
      }
    ],
    "padding-line-between-statements": [
      "error",
      {
        "blankLine": "always",
        "prev": ["const", "let", "var"],
        "next": "*"
      },
      {
        "blankLine": "any",
        "prev": ["const", "let", "var"],
        "next": ["const", "let", "var"]
      },
      {
        "blankLine": "always",
        "prev": "*",
        "next": ["class", "return", "export"]
      }
    ]
  },
  "env": {
    "browser": true,
    "node": true,
    "mocha": true,
    "es6": true
  },
  "settings": {
    "parser": "typescript-eslint-parser",
    "rules": {
      "import/no-unresolved": "error"
    },
    "import/resolver": {
      "typescript": {}
    },
    "import/parsers": {
      "@typescript-eslint/parser": [".ts"]
    },
    "import/extensions": [".js", ".ts"]
  }
}