Method mount

packages/query-core/src/queryClient.ts:104–120

* Called by a framework adapter's `QueryClientProvider`-equivalent when it mounts, to start * listening for focus/online events and resume paused mutations. Ref-counted via an internal * mount count, so nested or multiple providers sharing the same `QueryClient` don't tear down * the shared

()

   * the shared listeners until the last one unmounts.
   */
  mount(): void {
    this.#mountCount++
    if (this.#mountCount !== 1) return

    this.#unsubscribeFocus = focusManager.subscribe(async (focused) => {
      if (focused) {
        await this.resumePausedMutations()
        this.#queryCache.onFocus()
      }
    })
    this.#unsubscribeOnline = onlineManager.subscribe(async (online) => {
      if (online) {
        await this.resumePausedMutations()
        this.#queryCache.onOnline()
      }
    })
  }

  /**
   * The inverse of {@link QueryClient#mount} — called by a framework adapter's