Yeah. I think typescript has better predicate functions, maybe a slightly worse behavior in most places, and Flow is much much faster. But all of those differen

Yeah. I think typescript has better predicate functions, maybe a slightly worse behavior in most places, and Flow is much much faster. But all of those differences get swamped by the "everyone is using it" effect. Typescript "won" in some vague narrative/consensus sense, so we standardise on it, and we get the ecosystem benefit of types existing for every NPM package.