ReactTestUtils.Simulate logs unexpected console error

[harboecp]

To reproduce, open http://jsfiddle.net/0jjnaghw/
Error is logged to browser dev tools (in Chrome & Firefox, somehow not in Safari).

Happens on v15.0.0-rc.2 and on latest master version.

The assignment of additional event data to the newly created SyntheticEvent triggers a console error:

react/src/test/ReactTestUtils.js

Line 502 in 3a4e1db

assign(event, eventData);

"Warning: This synthetic event is reused for performance reasons."

[zpao]

Thanks for reporting. We'll get this fixed.

[gaearon]

Are we not checking for unexpected warnings in tests? Should we? Curious how this crept in unnoticed.

[zpao]

node doesn't support Proxies so none of that code is actually getting tested :/ Even running with --harmony flag (which we do at least with grunt test) doesn't enable it since it's "in progress". We could probably run with --harmony_proxies to force it on.