Add web front-end and fix API issues

node_modules/rxjs/dist/esm5/internal/operators/expand.js

@@ -0,0 +1,10 @@
+import { operate } from '../util/lift';
+import { mergeInternals } from './mergeInternals';
+export function expand(project, concurrent, scheduler) {
+    if (concurrent === void 0) { concurrent = Infinity; }
+    concurrent = (concurrent || 0) < 1 ? Infinity : concurrent;
+    return operate(function (source, subscriber) {
+        return mergeInternals(source, subscriber, project, concurrent, undefined, true, scheduler);
+    });
+}
+//# sourceMappingURL=expand.js.map