1 files changed, 40 insertions, 0 deletions

diff --git a/client/src/app/helpers/zone.ts b/client/src/app/helpers/zone.ts
new file mode 100644
index 000000000..74eed7032
--- /dev/null
+++ b/client/src/app/helpers/zone.ts
@@ -0,0 +1,40 @@
+import { SchedulerLike, Subscription } from 'rxjs'
+import { NgZone } from '@angular/core'
+
+class LeaveZoneScheduler implements SchedulerLike {
+  constructor (private zone: NgZone, private scheduler: SchedulerLike) {
+  }
+
+  schedule (...args: any[]): Subscription {
+    return this.zone.runOutsideAngular(() =>
+      this.scheduler.schedule.apply(this.scheduler, args)
+    )
+  }
+
+  now (): number {
+    return this.scheduler.now()
+  }
+}
+
+class EnterZoneScheduler implements SchedulerLike {
+  constructor (private zone: NgZone, private scheduler: SchedulerLike) {
+  }
+
+  schedule (...args: any[]): Subscription {
+    return this.zone.run(() =>
+      this.scheduler.schedule.apply(this.scheduler, args)
+    )
+  }
+
+  now (): number {
+    return this.scheduler.now()
+  }
+}
+
+export function leaveZone (zone: NgZone, scheduler: SchedulerLike): SchedulerLike {
+  return new LeaveZoneScheduler(zone, scheduler)
+}
+
+export function enterZone (zone: NgZone, scheduler: SchedulerLike): SchedulerLike {
+  return new EnterZoneScheduler(zone, scheduler)
+}