Correct check for undefined variable

[mathiasrw]

The code was comparing the result of typeof with a variable named undefined.

As typeof returns a string it should compare to 'undefined'

[etpinard]

Thanks for PR! Good 👀

Looks like this line has the same typo in it.

Do you know, if these typos cause any bugs?

These lines look like artefacts my eyes. Maybe we could simply remove them?

[mathiasrw]

I fixed the line you linked to too.

The bug is that typeof x === undefined will never be true and typeof x !== undefined is never true.

I am not sure how to invoke the code in plotly where the bug was located...

[etpinard]

I am not sure how to invoke the code in plotly where the bug was located...

Ok. Fair enough. Like I said, the two lines modified are probably artefacts.

In any case, your PR does fix to their intended behaviour, so let's merge this in.

Thanks for your PR 🍻