Method onSubscribe

src/queryCore/core/queryObserver.ts:107–117

()

  }

  protected onSubscribe(): void {
    if (this.listeners.length === 1) {
      this.currentQuery.addObserver(this)

      if (shouldFetchOnMount(this.currentQuery, this.options)) {
        this.executeFetch()
      }

      this.updateTimers()
    }
  }

  protected onUnsubscribe(): void {
    if (!this.listeners.length) {