Synthetic Event breaks in IE11

[juanca]

Do you want to request a feature or report a bug?

Bug.

What is the current behavior?

SyntheticEvent.js breaks in IE11.

Object.assign is explicitly used to extend the prototype of SyntheticEvent.

react-tap-event-plugin/src/SyntheticEvent.js

Line 123 in f7ed5c5

Object.assign(SyntheticEvent.prototype, {

What is the expected behavior?

SyntheticEvent.js should work.

Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?

Broken in React 16 + IE11 + react-tap-event-plugin. It used to work in React 15 + IE11 + react-tap-event-plugin.

Is the recommended approach to use babel to polyfill Object.assign?

See facebook#11788

[adipascu]

I am having the same issue when running on Android 5.1.
Please consider avoiding Object.assign or build the dist bundle with babel.