f350c7a58e
Summary: In Flow version 0.134, [types-first](https://flow.org/en/docs/lang/types-first/) will become the default mode for Flow. Given that this mode might introduce some errors due to missing annotations, we're pinning the previously default mode, to avoid introducing new errors. Note that in Jan 2021 we will be removing support for Flow classic mode. * Documentation for properly upgrading to types-first: https://flow.org/en/docs/cli/annotate-exports/ * Announcement post: https://medium.com/flow-type/types-first-a-scalable-new-architecture-for-flow-3d8c7ba1d4eb Reviewed By: mroch Differential Revision: D23606450 fbshipit-source-id: f849275269974e17c0ebe00885e387ccd9956b6d