.eslintrc.json

{
  "extends": "google",
  "parser": "@typescript-eslint/parser",
  "plugins": ["@typescript-eslint"],
  "parserOptions": {
    "ecmaVersion": 2017,
    "sourceType": "module"
  },
  "rules": {
    "max-len": [2, 100, {
      "ignoreComments": true,
      "ignoreUrls": true,
      "tabWidth": 2
    }],
    "no-implicit-coercion": [2, {
      "boolean": false,
      "number": true,
      "string": true
    }],
    "no-unused-expressions": [2, {
      "allowShortCircuit": true,
      "allowTernary": false
    }],
    "no-unused-vars": [2, {
      "vars": "all",
      "args": "after-used",
      "argsIgnorePattern": "(^reject$|^_$)",
      "varsIgnorePattern": "(^_$)"
    }],
    "quotes": [2, "single"],
    "require-jsdoc": 0,
    "valid-jsdoc": 0,
    "prefer-arrow-callback": 1,
    "no-var": 1
  },
  "env": {
    "node": true,
    "jasmine": true
  },
  "overrides": [
    {
      "files": ["**/*.ts"],
      "extends": [
        "plugin:@typescript-eslint/eslint-recommended",
        "plugin:@typescript-eslint/recommended"
      ],
      "rules": {
        "@typescript-eslint/no-non-null-assertion": 0
      }
    }
  ]
}