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

Type safe replacement for node's EventEmitter

import type { 
    NonPostableEvtLike, 
    StatefulReadonlyEvtLike, 
    StatefulEvt, 
    Evt,
} from "../interfaces";


type ToPostableEvtBase<E extends NonPostableEvtLike<any>> =
        E extends StatefulReadonlyEvtLike<infer U> ? StatefulEvt<U> :
        E extends NonPostableEvtLike<infer U> ? Evt<U> : never
    ;

type ToPostableEvtRecord<R extends { [key: string]: any; }> = {
    [P in keyof R]: R[P] extends NonPostableEvtLike<any> ? ToPostableEvtBase<R[P]> : R[P];
};

/** https://docs.evt.land/api/helpertypes#topostableevt-less-than-e-greater-than */
export type ToPostableEvt<E extends ({ [key: string]: any; } | NonPostableEvtLike<any>)> =
    E extends NonPostableEvtLike<any> ? ToPostableEvtBase<E> :
    ToPostableEvtRecord<E>
    ;