function getCallbackSetter (funcName) {
  return function (...args) {
    const that = this; // New callback
    const callbackID = this.send(funcName, args, function () { /* empty fn */ }); // The callback (currently it's nothing, but will be set later)

    return function (newCallback) {
      that.callbacks[callbackID] = newCallback; // Set callback
    };
  };
}
@param {string} funcName
@returns {module:EmbeddedSVGEdit.CallbackSetGetter}