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Re:LightSpeed: Rewriting Messenger’s codebase for a faster, ... by Illniyar on Tuesday March 03, 2020 @12:31AM (#22472071)
As far as I know messenger was never written in a cross-platform way, neither RN or otherwise.

Is there anywhere that suggets it was ever non native?

Re:LightSpeed: Rewriting Messenger’s codebase for a faster, ... by danabramov on Tuesday March 03, 2020 @05:10AM (#22473216)
It was fully native.
Re:LightSpeed: Rewriting Messenger’s codebase for a faster, ... by vijaybritto on Tuesday March 03, 2020 @06:32AM (#22473562)
Not sure why people are downvoting an insider answer from an actual FB employee