Global declarations

[patrikholcak]

I was just curious if there’s any possibility of having support for declarations declared in the [libs] field of .flowconfig.

It would make this possible:

// should work without import type {…}

class App extends React.Component {
  static defaultProps = {};
  props: {
    dispatch: Dispatcher<Action>
  }

  doAction(ev: SyntheticEvent) {
    …
  }
}

where SyntheticEvent is global declaration in flow’s react module declarations and Dispatcher and Action are loaded from .flowconfig libs. This already works with flow check command.

Stumbled upon this when I was setting up a new project with flow. Running flow check did not report any errors but when I started a webpack server, I got a Dispatcher is not defined error.

[phpnode]

Absolutely yes, in v4 we parse the flow config to extract that kind of info, and then go and build our own model of those types. This will result in much better flow compatibility, but it's not close to release yet

[patrikholcak]

Awesome! And thanks for the quick reply. Is there any timeline on v4?

[phpnode]

With luck a couple of weeks, free time allowing

[patrikholcak]

Splendid! Thanks! 🍻