function ensureInjected() {
  ("production" !== process.env.NODE_ENV ? invariant(
    ReactUpdates.ReactReconcileTransaction && batchingStrategy,
    'ReactUpdates: must inject a reconcile transaction class and batching ' +
    'strategy'
  ) : invariant(ReactUpdates.ReactReconcileTransaction && batchingStrategy));
}
Array comparator for ReactComponents by owner depth

@param {ReactComponent} c1 first component you're comparing
@param {ReactComponent} c2 second component you're comparing
@return {number} Return value usable by Array.prototype.sort().