Summary:
At present, there's no uniform way of determining whether you've received an Animated value node which can be attached to an animated prop.
You can attempt to use `instanceof Animated.Value`, but this fails for interpolated values. You can use `instanceof Animated.Interpolation`, but this fails for the values that are returned from the math functions (e.g., `Animated.Add`).
This commit exposes the base type from which all of these value nodes derive. As such, it is now possible to do the following:
```js
import React, { Component, PropTypes } from 'react';
import { Animated } from 'react-native';
class Widget extends Component {
static propTypes = {
progress: PropTypes.instanceOf(Animated.Node).isRequired,
}
// ...
}
```
Unnecessary for cosmetic change.
Closes https://github.com/facebook/react-native/pull/14688
Differential Revision: D5581539
Pulled By: shergin
fbshipit-source-id: 98f40e63a463241c7f91c72391c26c3b4153e4cd
James Reggio
8d757e5ad7