evt/src/lib/types/helper/ToNonPostableEvt.ts

Type safe replacement for node's EventEmitter

import type {  StatefulReadonlyEvtLike, NonPostableEvtLike, NonPostableEvt, StatefulReadonlyEvt } from "../interfaces";

type ToNonPostableEvtBase<E extends NonPostableEvt<any>> =
    E extends StatefulReadonlyEvtLike<infer U> ? StatefulReadonlyEvt<U> :
    E extends NonPostableEvtLike<infer U> ? NonPostableEvt<U> : never
    ;

type ToNonPostableEvtRecord<R extends { [key: string]: any; }> = {
    [P in keyof R]: R[P] extends NonPostableEvt<any> ? ToNonPostableEvtBase<R[P]> : R[P];
};

/** https://docs.evt.land/api/helpertypes#tononpostableevt-less-than-e-greater-than */
export type ToNonPostableEvt<E extends ({ [key: string]: any; } | NonPostableEvt<any>)> =
    E extends NonPostableEvt<any> ? ToNonPostableEvtBase<E> :
    ToNonPostableEvtRecord<E>
    ;