docs: function SyntheticEvent(dispatchConfig, targetInst, nativeEvent, nativeEventTarget) {
    if ("development" !== 'production') {
      // these have a getter/setter for warnings
      delete this.nativeEvent;
      delete this.preventDefault;
      delete this.stopPropagation;
    }
  
    this.dispatchConfig = dispatchConfig;
    this._targetInst = targetInst;
    this.nativeEvent = nativeEvent;
  
    var Interface = this.constructor.Interface;
    for (var propName in Interface) {
      if (!Interface.hasOwnProperty(propName)) {
        continue;
      }
      if ("development" !== 'production') {
        delete this[propName]; // this has a getter/setter for warnings
      }
      var normalize = Interface[propName];
      if (normalize) {
        this[propName] = normalize(nativeEvent);
      } else {
        if (propName === 'target') {
          this.target = nativeEventTarget;
        } else {
          this[propName] = nativeEvent[propName];
        }
      }
    }
  
    var defaultPrevented = nativeEvent.defaultPrevented != null ? nativeEvent.defaultPrevented : nativeEvent.returnValue === false;
    if (defaultPrevented) {
      this.isDefaultPrevented = emptyFunction.thatReturnsTrue;
    } else {
      this.isDefaultPrevented = emptyFunction.thatReturnsFalse;
    }
    this.isPropagationStopped = emptyFunction.thatReturnsFalse;
    return this;
  }