Updated the files.

my-app/node_modules/rxjs/dist/esm5/internal/observable/timer.js

@@ -0,0 +1,36 @@
+import { Observable } from '../Observable';
+import { async as asyncScheduler } from '../scheduler/async';
+import { isScheduler } from '../util/isScheduler';
+import { isValidDate } from '../util/isDate';
+export function timer(dueTime, intervalOrScheduler, scheduler) {
+    if (dueTime === void 0) { dueTime = 0; }
+    if (scheduler === void 0) { scheduler = asyncScheduler; }
+    var intervalDuration = -1;
+    if (intervalOrScheduler != null) {
+        if (isScheduler(intervalOrScheduler)) {
+            scheduler = intervalOrScheduler;
+        }
+        else {
+            intervalDuration = intervalOrScheduler;
+        }
+    }
+    return new Observable(function (subscriber) {
+        var due = isValidDate(dueTime) ? +dueTime - scheduler.now() : dueTime;
+        if (due < 0) {
+            due = 0;
+        }
+        var n = 0;
+        return scheduler.schedule(function () {
+            if (!subscriber.closed) {
+                subscriber.next(n++);
+                if (0 <= intervalDuration) {
+                    this.schedule(undefined, intervalDuration);
+                }
+                else {
+                    subscriber.complete();
+                }
+            }
+        }, due);
+    });
+}
+//# sourceMappingURL=timer.js.map