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by zefei 3146 days ago
Both flow and typescript are great tools. Typescript has much better tooling and great IDE integration, using typescript is a no-brainer for new projects. Flow's soundness does shine though once your codebase (and your team) becomes very big, as any unsafe cast can be reliably treated as error. I use flow at work, and so far my experience is that unsafe cast in flow always indicates a bad design or actual bug.