Method _setProperty

packages/helpers/classes/mail.js:612–623

* Set a property with normal undefined and type-checks

(propertyName, value, propertyType)

   * Set a property with normal undefined and type-checks
   */
  _setProperty(propertyName, value, propertyType) {
    let propertyChecksPassed = this._checkProperty(
      propertyName,
      value,
      [this._checkUndefined, this._createTypeCheck(propertyType)]);

    if (propertyChecksPassed) {
      this[propertyName] = value;
    }

    return propertyChecksPassed;
  }

  /**
   * Fail if the value is undefined.