I am about to pick Flow for some off-time play; and I want to understand form the learned in the community; would PropTypes still have a role to play, if we move to a static type checking solution like Flow, or TypeScript?

And has anyone of you been on this path?

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Flow-typed props are superior in almost every way to the built PropTypes.
The only drawback that you might have is that FlowType is still not well known, so people reading your code might be confused by some FlowType notations.