Add web front-end and fix API issues

node_modules/rxjs/dist/esm/internal/operators/joinAllInternals.js

@@ -0,0 +1,9 @@
+import { identity } from '../util/identity';
+import { mapOneOrManyArgs } from '../util/mapOneOrManyArgs';
+import { pipe } from '../util/pipe';
+import { mergeMap } from './mergeMap';
+import { toArray } from './toArray';
+export function joinAllInternals(joinFn, project) {
+    return pipe(toArray(), mergeMap((sources) => joinFn(sources)), project ? mapOneOrManyArgs(project) : identity);
+}
+//# sourceMappingURL=joinAllInternals.js.map