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.

var inst = this;
  ReactDOMTextarea.postMountWrapper(inst);
}
function optionPostMount() {
  var inst = this;
  ReactDOMOption.postMountWrapper(inst);
}
var setAndValidateContentChildDev = emptyFunction;
if (__DEV__) {
  setAndValidateContentChildDev = function(content) {
    var hasExistingContent = this._contentDebugID != null;
    var debugID = this._debugID;
    
    var contentDebugID = -debugID;
    if (content == null) {
      if (hasExistingContent) {
        ReactInstrumentation.debugTool.onUnmountComponent(this._contentDebugID);
      }
      this._contentDebugID = null;
      return;
    }
    validateDOMNesting(null, String(content), this, this._ancestorInfo);
    this._contentDebugID = contentDebugID;
    if (hasExistingContent) {
      ReactInstrumentation.debugTool.onBeforeUpdateComponent(contentDebugID, content);
      ReactInstrumentation.debugTool.onUpdateComponent(contentDebugID);
    } else {
      ReactInstrumentation.debugTool.onBeforeMountComponent(contentDebugID, content, debugID);
      ReactInstrumentation.debugTool.onMountComponent(contentDebugID);