Method _doArrayCheck

packages/helpers/classes/mail.js:668–673

* Check that a value isn't undefined and is an array.

(propertyName, value)

   * Check that a value isn't undefined and is an array.
   */
  _doArrayCheck(propertyName, value) {
    return this._checkProperty(
      propertyName,
      value,
      [this._checkUndefined, this._createCheckThatThrows(Array.isArray, 'Array expected for`' + propertyName + '`')]);
  }

  /**
   * Set the replyToList from email body