Dev Tools evolved a lot the last months.

Last version doesn't display well functions in props, it leaves an empty field so hard to see if the prop is really passed and if there's really and function passes in the props of the component.

For example  i dont' know if the prop `onChange` really exists as a prop of the component `TokenInput`.
Don't know also which props are undefined.

Could be also great to use the propTypes to show the types of the props.

![image](https://user-images.githubusercontent.com/25119847/71781247-b5e8fb00-2fcc-11ea-9a08-86f7b772a138.png)


![image](https://user-images.githubusercontent.com/25119847/71781235-8c2fd400-2fcc-11ea-8c3f-fb0afe3ab8fc.png)

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow
 */
import typeof ReactTestRenderer from 'react-test-renderer';
import type {
  CopyInspectedElementPath,
  GetInspectedElementPath,
  StoreAsGlobal,
} from 'react-devtools-shared/src/devtools/views/Components/InspectedElementContext';
import type {FrontendBridge} from 'react-devtools-shared/src/bridge';
import type Store from 'react-devtools-shared/src/devtools/store';
describe('InspectedElementContext', () => {
  let React;
  let ReactDOM;
  let PropTypes;
  let TestRenderer: ReactTestRenderer;
  let bridge: FrontendBridge;
  let store: Store;