Preloaded JS function "is not defined"

Mobile
1

I have a mobile app that is telling me that is cannot find my JS.

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To be clear, it is actually working just fine in the IDE, despite the fact that the linter is giving the same error in the editor:

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Here is the definition:

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2

If I prefix window. to the function, it works and the linter is also happy. So in Mobile this seems to be a requirement.