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* Only bind module.exports if no local definition exists Note that this uses `lookupSymbolForNameWorker`, which is really a best-effort check since it only knows about symbols that it has already encountered. As a side-effect, even when `module` is bound as part of a `module.exports` reference, it only declares it once instead of one declaration per reference. * Only type module.exports inside module files It is an error inside script files, but the binder sometimes creates a ModuleExports symbol because we doesn't know whether we have a commonjs module until after binding is done. * Only bind module.exports in a commonjs module Note that this, too, is a best-effort check since evidence of commonjs-ness may be found after a *reference* to module.exports. (A reference to module.exports alone is not enough evidence that a file is commonjs. It has to have an assignment to it.)