Only transform 'this'->'undefined' and inject 'use strict' if module statements are present #6280
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This is a step toward #6242 that I think we can all agree on no matter what. This brings Babel more in line with "unambiguous" behavior, which ideally will change to just checking
sourceType
pending the issue above.This at least makes it so we don't 100% break CommonJS modules if Babel is run on them.