[lib] Add missing import
[lib] Add missing import

Summary: The import was missing. I need to investigate my git hooks, so that it won't happen again. I'm really sorry!

Test Plan: Flow

Reviewers: ashoat

Reviewed By: ashoat

Subscribers: KatPo, Adrian, atul

Differential Revision: https://phabricator.ashoat.com/D987

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