Allow returning non-serializable values from waitFor
#732
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Closes #633.
Previously, using
waitFor
only would return values if they were serializable. (The new test would fail,waitFor
would returnundefined
). This is because our implementation ofwaitFor
defers to Testing Library's in-browser implementation (uses MutationObserver + timers to watch for changes). Previously the return value got passed to the browser and back.In this PR, I changed the return value from the callback to never go to the browser and back, it just stays in node, so we don't have to worry about serialization or deserialization.