node_modules/rxjs/dist/esm5/internal/observable/using.js

import { Observable } from '../Observable';
import { innerFrom } from './innerFrom';
import { EMPTY } from './empty';
export function using(resourceFactory, observableFactory) {
    return new Observable(function (subscriber) {
        var resource = resourceFactory();
        var result = observableFactory(resource);
        var source = result ? innerFrom(result) : EMPTY;
        source.subscribe(subscriber);
        return function () {
            if (resource) {
                resource.unsubscribe();
            }
        };
    });
}
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