Method once

packages/db/src/event-emitter.ts:37–46

* Subscribe to an event once (automatically unsubscribes after first emission) * @param event - Event name to listen for * @param callback - Function to call when event is emitted * @returns Unsubscribe function

(
    event: T,
    callback: (event: TEvents[T]) => void,
  )

   * @returns Unsubscribe function
   */
  once<T extends keyof TEvents>(
    event: T,
    callback: (event: TEvents[T]) => void,
  ): () => void {
    const unsubscribe = this.on(event, (eventPayload) => {
      callback(eventPayload)
      unsubscribe()
    })
    return unsubscribe
  }

  /**
   * Unsubscribe from an event