fineui-custum-tree-demo/node_modules/rxjs/_esm2015/internal/observable/using.js

import { Observable } from '../Observable';
import { from } from './from';
import { EMPTY } from './empty';
export function using(resourceFactory, observableFactory) {
    return new Observable(subscriber => {
        let resource;
        try {
            resource = resourceFactory();
        }
        catch (err) {
            subscriber.error(err);
            return undefined;
        }
        let result;
        try {
            result = observableFactory(resource);
        }
        catch (err) {
            subscriber.error(err);
            return undefined;
        }
        const source = result ? from(result) : EMPTY;
        const subscription = source.subscribe(subscriber);
        return () => {
            subscription.unsubscribe();
            if (resource) {
                resource.unsubscribe();
            }
        };
    });
}
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