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node_modules/rxjs/_esm5/internal/observable/using.js

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+/** PURE_IMPORTS_START _Observable,_from,_empty PURE_IMPORTS_END */
+import { Observable } from '../Observable';
+import { from } from './from';
+import { EMPTY } from './empty';
+export function using(resourceFactory, observableFactory) {
+    return new Observable(function (subscriber) {
+        var resource;
+        try {
+            resource = resourceFactory();
+        }
+        catch (err) {
+            subscriber.error(err);
+            return undefined;
+        }
+        var result;
+        try {
+            result = observableFactory(resource);
+        }
+        catch (err) {
+            subscriber.error(err);
+            return undefined;
+        }
+        var source = result ? from(result) : EMPTY;
+        var subscription = source.subscribe(subscriber);
+        return function () {
+            subscription.unsubscribe();
+            if (resource) {
+                resource.unsubscribe();
+            }
+        };
+    });
+}
+//# sourceMappingURL=using.js.map