Add web front-end and fix API issues

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

@@ -0,0 +1,21 @@
+import { asyncScheduler } from '../scheduler/async';
+import { operate } from '../util/lift';
+import { createOperatorSubscriber } from './OperatorSubscriber';
+export function timeInterval(scheduler = asyncScheduler) {
+    return operate((source, subscriber) => {
+        let last = scheduler.now();
+        source.subscribe(createOperatorSubscriber(subscriber, (value) => {
+            const now = scheduler.now();
+            const interval = now - last;
+            last = now;
+            subscriber.next(new TimeInterval(value, interval));
+        }));
+    });
+}
+export class TimeInterval {
+    constructor(value, interval) {
+        this.value = value;
+        this.interval = interval;
+    }
+}
+//# sourceMappingURL=timeInterval.js.map