If Facebook would agree on using standard Typescript, instead of their own thing, that would be amazing.
That would save everybody time. Imagine google, facebook and microsoft agreeing on that, and i think it wouldn't take more than 6 months to see it working in chrome, internet explorer and all the other major browsers would follow.
With the new microsoft, and now facebook and google talking to each others, this is the first time something like this could actually become a reality.
There are things Flow gets right compared to TypeScript. For instance requiring to check the nullness when using the question mark type e.g. `SomeType?`.