Even though I'm a huge TypeScript fan, I'm grateful for the existence of Flow.
Their focus on soundness has shown the TypeScript team that they should give a lot more priority to getting the typesystem in a better shape over the years. If Flow didn't exist, I doubt we'd be seeing many of the features in TypeScript's --strict mode.
Plus, they were the first to develop some features like intersection types, or even some of the advanced type transformations. Shame it was (at least historically) a bit difficult to find them in the docs.
I'm hoping Flow can push TS to close up the remaining soundness gaps, and fix up some of their features (sealed vs open types is much better than the strange object literal checks in TS)
Their focus on soundness has shown the TypeScript team that they should give a lot more priority to getting the typesystem in a better shape over the years. If Flow didn't exist, I doubt we'd be seeing many of the features in TypeScript's --strict mode.
Plus, they were the first to develop some features like intersection types, or even some of the advanced type transformations. Shame it was (at least historically) a bit difficult to find them in the docs.
I'm hoping Flow can push TS to close up the remaining soundness gaps, and fix up some of their features (sealed vs open types is much better than the strange object literal checks in TS)