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Having used both extensively, TS is simply the better choice. Flow has multiple large bugs and issues, which many would consider critical, open and unsolved on their GitHub repo for more than a year(!) [1][2][3].

[1] https://github.com/facebook/flow/issues/245 [2] https://github.com/facebook/flow/issues/869 [3] https://github.com/facebook/flow/issues/1528

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I struggled with multiple blind spots in Flow in the past, but recently tried porting the same code to Flow and Typescript and I was surprised that Flow took less work than TypeScript. Flow 0.43.1 has become very fast and seems to need less type annotations compared to TypeScript with noImplicitAny enabled. I wonder whether Flow’s happily infers any without complaining or whether its program flow analysis remains more sophisticated.

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