Method once

src/web-ui/src/tools/git/services/GitEventService.ts:55–60

(
    eventType: T, 
    listener: GitEventListener<T>
  )

  }

  once<T extends GitEventType>(
    eventType: T, 
    listener: GitEventListener<T>
  ): () => void {
    return this.on(eventType, listener, { once: true });
  }

  off<T extends GitEventType>(
    eventType: T,