Improve error message when a map passed by mistake as a child to fragment #555
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... or to ErrorBoundary (which uses comp/fragment).
Without this change, we assume the map is props, and end up getting a warning like "Warning: Invalid prop
some-prop...
supplied toReact.Fragment
. React.Fragment can only havekey
andchildren
props."With this change, we get a proper error about trying to render the wrong type, and in which component.
WHY: The warning makes it harder to understand what the actual problem is.