Use gluing modules for external module support #63
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In this PR I changed the way we support external modules to what is described in angular/tsickle#1041.
Previously, what we did is described in readme: https://github.com/theseanl/tscc/tree/b0f656e773bc4b43dba6876aa68340f2b5d71dd8#detailed-description-of-external-modules-handling
In addition to that, we used some wild hacks that required patching tsickle in order to prevent generation of
goog.requireType()
for external modules.The way described in the above linked issue requires is simpler and make us free of such hacks. I also vaguely think that this will provide a more correct behavior in case of accessing an external module's global name having side effects.