Return UNDEFINED if type neither string nor function in ReactElement plugin #4360
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Summary
Fixes #3823
The same “tag name” for anonymous function and undefined type seems confusing, therefore:
<Unknown>
if type is anonymous function as it has been<UNDEFINED>
if type is neither string nor functionWe think it seems easier to see and solve the problem if tests make it obvious (assuming that people review snapshots before committing :) than if the plugin throws an error.
Test plan
Updated the existing test for this case