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I ran into an issue where I had an event handler that called setState by passing in a function and accessing e.target.value inside that function. It seems that Reacts synthetic events are "garbage collected" after the event handler has finished executing, which gave me an error when I tried to access value of undefined (since all properties were removed from the event object).
This is fine, and easy to fix by destructuring the event as in the argument (({target: {value}}) => this.setState(...) instead of e => this.setState(...)), but it should probably be documented.
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