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Why not just think unresolved JavaScript variable an error?

I am from Java and cannot figure out that. Is it because JavaScript have some unresolved JavaScript variable that even IDE cannot know?

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Here is a scenario: webstorm cannot predict what variables will be available globally. For example check jQuery's $ sign.

A related question: Webstorm says console is an unresolved variable

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Other reasons: variable is only known in runtime, because it is a property of json received through ajax call, for example; or, property is constructed dynamically while executing the program can thus can't be resolved during static analysis. This is a consequence of JavaScript dynamic nature: as we can't tell for sure if this unresolved variable a user error that needs to be fixed, we show it as a warning rather than error

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