message: Created SceneProxy props type
diff: import * as React from 'react';
  import * as ReactDOM from 'react-dom';
  +type SceneProxyProps = {crumb: number, app: React.ComponentClass<{crumb: number}>};
  -class SceneProxy extends React.Component<{crumb: number, app: React.ComponentClass<{crumb: number}>}> {
  +class SceneProxy extends React.Component<SceneProxyProps> {
  private sceneEl: React.RefObject<HTMLDivElement>;
  constructor(props) {
  super(props);
  