.eslintrc.json

{
    "extends": ["plugin:@typescript-eslint/recommended"],
    "parser": "babel-eslint",
    "overrides": [{
      "files": ["**/*.ts"],
      "parser": "@typescript-eslint/parser",
      "plugins": ["@typescript-eslint"],
      "rules": {
        "no-unused-vars": "off",
        "@typescript-eslint/no-unused-vars": "warn",
        "no-useless-constructor": "off",
        "@typescript-eslint/no-useless-constructor": "error"
      }
    }],
    "settings": {
      // The following settings seem to be necessary in order for the import
      // plugin to work correctly with @typescript-eslint/parser.
      // https://medium.com/@myylow/how-to-keep-the-airbnb-eslint-config-when-moving-to-typescript-1abb26adb5c6
      "import/extensions": [".js", ".ts"],
      "import/parsers": {
        "@typescript-eslint/parser": [".ts"]
      },
      "import/resolver": {
        "node": {
          "extensions": [".js", ".ts"]
        }
      }
    },
    "rules": {
        "max-len": ["error", { "code": 102 }],
        "semi": ["error", "always"],
        "quotes": ["error", "single"],
        "camelcase": "off",
        "import/extensions": "off",
        "no-multiple-empty-lines": ["error", { "max": 3, "maxEOF": 1 }],
        "prefer-promise-reject-errors": "off",
        "comma-dangle": "off",
        "no-console": "off",
        "no-new-object": "error",
        "no-plusplus": "off",
        "object-shorthand": ["error", "never"],
        "no-shadow": ["error", {"allow": ["error"]}],
        "no-use-before-define": [2, {"functions": false, "classes": true}],
        "prefer-template": "off",
        "prefer-destructuring": "off",
        "object-curly-spacing": "off",
        "dot-notation": "off",
        "lines-between-class-members": "off",
        "no-param-reassign": "off",
        "no-await-in-loop": "off",
        "no-restricted-globals": "off",
        "no-underscore-dangle": "off",
        "operator-linebreak": ["error", "after"],
        "no-constant-condition": ["error", { "checkLoops": false }],
        "no-restricted-syntax": ["error", {
          "selector": "ForInStatement",
          "message": "for..in loops iterate over the entire prototype chain, which is virtually never what you want. Use Object.{keys,values,entries}, and iterate over the resulting array."
        }, {
          "selector": "LabeledStatement",
          "message": "Labels are a form of GOTO; using them makes code confusing and hard to maintain and understand."
        }, {
          "selector": "WithStatement",
          "message": "`with` is disallowed in strict mode because it makes code impossible to predict and optimize."
        }]
    }
  }