mst-effect/dist/esm/effect/doll-effect.js

Designed to be used with MobX-State-Tree to create asynchronous actions using RxJS.

import { Subject } from 'rxjs';
import { take } from 'rxjs/operators';
import { addDisposer } from 'mobx-state-tree';
import { subscribe } from './utils';
export function dollEffect(self, factory) {
    const payloadSource = new Subject();
    const signalSource = new Subject();
    const effect$ = factory(payloadSource.asObservable(), (value) => signalSource.next(value));
    const subscription = subscribe(self, factory, effect$);
    addDisposer(self, () => {
        payloadSource.complete();
        signalSource.complete();
        subscription.unsubscribe();
    });
    return (payload, handler) => {
        const promise = (typeof handler === 'function' ? handler(signalSource.asObservable()) : signalSource)
            .pipe(take(1))
            .toPromise();
        payloadSource.next(payload);
        return promise;
    };
}