I'm using ES6 and the Flow type checker in a project.
Suppose I've got two type aliases, defined only in terms of what methods are expected of them (like a Java interface):
type Airplane = {
takeOff: (() => void);
land: (() => void);
};
type Car = {
drive: ((speed: number) => void);
};
How would I define a class FlyingCar
to demonstrate to the type checker that it is both a Car
and an Airplane
? I'm using ECMAScript 6 classes.
For a type I suspect it would look something like:
type FlyingCar = (Airplane & Car);
I can't seem to reconcile what I want with the class syntax, though, since it seems to be tied into ES6's class syntax.
You don't have to demonstrate it to flow. Flow implements structural type system, so you simply need to implement both type in your class.
This doesn't type check:
this does: