.eslintrc.json

{
  "parserOptions": {
    "ecmaVersion": 6,
    "sourceType": "script"
  },
  "extends": ["semistandard"],
  "env": {
    "node": true,
    "mocha": true
  },
  "rules": {
    "no-unused-expressions": "off",
    "chai-friendly/no-unused-expressions": "error",
    "require-jsdoc": ["error", {
      "require": {
          "FunctionDeclaration": true,
          "MethodDefinition": true,
          "ClassDeclaration": true,
          "ArrowFunctionExpression": true
      }
    }],
    "valid-jsdoc": ["error", {
      "prefer": {
        "returns": "return",
        "arg": "param",
        "argument": "param"
      },
      "preferType": {
        "Boolean": "boolean",
        "Number": "number",
        "object": "Object",
        "String": "string"
      }
    }]
  },
  "plugins": [
    "chai-friendly",
    "chai-expect"
  ]
}