Evt.asPostable(evt)

Cast the passed event as portable.

Evt.asNonPostable() is the identity function with special type annotation

Use this method only onEvt you instantiated yourself. Not as a hack to trigger events on Evt that have been exposed as non-postable by an API.

To invoke post() on a NonPostableEvt or a StatefullReadonlyEvt.

Usecase:

Without this method this would be the way for a class to expose Evt that are posted internally and exposed to be listened.

import { Evt } from "evt";
class Socket2 {
private readonly _evtIsConnected= Evt.create(false);
private readonly _evtMessage= Evt.create<Uint8Array>();
readonly evtIsConnected= Evt.asNonPostable(this._evtIsConnected);
readonly evtMessage= Evt.asNonPostable(this._evtMessage);
/*
OR, more explicit but require to repeat the types and to
import type { StatefulReadonlyEvt, NonPostableEvt } from "evt";
readonly evtIsConnected: StatefulReadonlyEvt<boolean>= this._evtIsConnected;
readonly evtMessage: NonPostableEvt<Uint8Array> = this._evtMessage;
*/
constructor(){
this._evtIsConnected.state = true;
this._evtMessage.post(new Uint8Array(111));
}
}

Now it can be frustrating to have to store a private property only to call post on a object that we know is postable. Here is were this method come in handy:

class Socket {
readonly evtIsConnected= Evt.asNonPostable(Evt.create(false));
readonly evtMessage= Evt.asNonPostable(Evt.create<Uint8Array>());
constructor(){
Evt.asPostable(this.evtIsConnected).state = true;
Evt.asPostable(this.evtMessage).post(new Uint8Array(111));
}
}