Add web front-end and fix API issues

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

@@ -0,0 +1,10 @@
+import { __read, __spreadArray } from "tslib";
+import { merge } from './merge';
+export function mergeWith() {
+    var otherSources = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        otherSources[_i] = arguments[_i];
+    }
+    return merge.apply(void 0, __spreadArray([], __read(otherSources)));
+}
+//# sourceMappingURL=mergeWith.js.map