Add web front-end and fix API issues

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

@@ -0,0 +1,15 @@
+import { map } from './map';
+import { innerFrom } from '../observable/innerFrom';
+import { operate } from '../util/lift';
+import { mergeInternals } from './mergeInternals';
+import { isFunction } from '../util/isFunction';
+export function mergeMap(project, resultSelector, concurrent = Infinity) {
+    if (isFunction(resultSelector)) {
+        return mergeMap((a, i) => map((b, ii) => resultSelector(a, b, i, ii))(innerFrom(project(a, i))), concurrent);
+    }
+    else if (typeof resultSelector === 'number') {
+        concurrent = resultSelector;
+    }
+    return operate((source, subscriber) => mergeInternals(source, subscriber, project, concurrent));
+}
+//# sourceMappingURL=mergeMap.js.map