Fix #15540: Throw error when importing @types#15866

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mhegazy merged 2 commits intomicrosoft:masterfrom nowy:FIX-15540

May 19, 2017

Commits on May 15, 2017

Fix microsoft#15540 : Throw error when importing @types
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Commits on May 16, 2017

FIX-15540: Review changes
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