Guard polyfills against window possibly being undefined #7205
+3 −2
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jxom requested review from Timer, amyrlam, bugzpodder, gaearon, ianschmitz, iansu, mrmckeb and petetnt as code owners 
ianschmitz suggested changes Aug 9, 2019
ianschmitz reviewed Aug 9, 2019
ianschmitz approved these changes Sep 24, 2019
ianschmitz changed the title 
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Hello!
This PR is just a small one, and ensures that window is not undefined before it invokes the polyfill.