David Aurelio 517abba6bb Require fbjs/lib/invariant instead of invariant
Summary: `'invariant'` can only be resolved by chance if node modules have been installed with npm3 or yarn, as it is a transitive dependency of `babel-traverse`. This changes the import to the direct dependency `fbjs/lib/invariant`.

Reviewed By: jeanlauliac, astreet

Differential Revision: D4462471

fbshipit-source-id: 5c841845012ed22a7c6264d46326a47807948513
2017-01-25 10:43:55 -08:00
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