Evt.factorize(evt)

This is the identity function with special type annotations.
If you have a variable that is either an Evt that post A or an Evt that post B you have an event that post A or B.
In other words Evt<A> | Evt<B> is assignable to Evt<A | B >. This method implements this property.
import { Evt, VoidEvt, matchVoid } from "evt";
​
declare evt: Evt<string> | Evt<number> | VoidEvt = Evt.create<any>();
​
evt.attach(data=> { }); // TS ERROR
​
Evt.factorize(evt) // OK, return Evt<string | number | void>
    .attach(data=> { // data is string | number | void
​
        //To test if data is void
        if( matchVoid(data) ){
            return;
        }
​
        //Here data is string | number.
​
    })
    ;
See also FactorizeEvt<E>, helper type that this method levrage.

Evt.loosenType(evt)

Evt.asPostable(evt)

Last modified 26d ago