Updated the files.

my-app/node_modules/rxjs/dist/cjs/internal/observable/using.js

@@ -0,0 +1,21 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.using = void 0;
+var Observable_1 = require("../Observable");
+var innerFrom_1 = require("./innerFrom");
+var empty_1 = require("./empty");
+function using(resourceFactory, observableFactory) {
+    return new Observable_1.Observable(function (subscriber) {
+        var resource = resourceFactory();
+        var result = observableFactory(resource);
+        var source = result ? innerFrom_1.innerFrom(result) : empty_1.EMPTY;
+        source.subscribe(subscriber);
+        return function () {
+            if (resource) {
+                resource.unsubscribe();
+            }
+        };
+    });
+}
+exports.using = using;
+//# sourceMappingURL=using.js.map