message: Typed NavigationHandler props
diff: import NavigationContext from './NavigationContext';
  +import { StateNavigator } from 'navigation';
  import * as React from 'react';
  -class NavigationHandler extends React.Component<any, any> {
  +class NavigationHandler extends React.Component<{ stateNavigator: StateNavigator }, any> {
  private onNavigate = () => {
  this.forceUpdate();
  }
  