We missed this because Flow wasn't being run properly on Travis but now that it is, it's clear that #7716 introduced a bunch of new Flow failures. Most of these shouldn't be too bad and I like to say "you break it you buy it" so this one is for you @Aweary :)

There were a couple other pre-existing Flow issues that @vjeux is going to fix, so mostly this should just be the TestRenderer issues.

enqueuePutListener(this, propKey, propValue, transaction);
        }
      } else {
        if (propKey === STYLE) {
          if (propValue) {
            if (__DEV__) {
              
              this._previousStyle = propValue;
            }
            propValue = this._previousStyleCopy = Object.assign({}, props.style);
          }
          propValue = CSSPropertyOperations.createMarkupForStyles(propValue, this);
        }
        var markup = null;
        if (this._tag != null && isCustomComponent(this._tag, props)) {
          if (!RESERVED_PROPS.hasOwnProperty(propKey)) {
            markup = DOMPropertyOperations.createMarkupForCustomAttribute(propKey, propValue);
          }
        } else {
          markup = DOMPropertyOperations.createMarkupForProperty(propKey, propValue);
        }
        if (markup) {
          ret += ' ' + markup;
        }
      }
    }
    
    
    if (transaction.renderToStaticMarkup) {
      return ret;