Задача Добавить прогресс загрузки в apollo-client

Предварительный вариант:

 
type FetchWithProgress = (
  input: RequestInfo | URL,
  init?: RequestInit & { onUploadProgress?: (percent: number) => void },
) => Promise<Response>

const fetchWithUploadProgress: FetchWithProgress = (input, init) => {
  const onProgress = init?.onUploadProgress

  if (typeof window === 'undefined' || !onProgress || !init?.body) {
    return fetch(input, init)
  }

  return new Promise<Response>((resolve, reject) => {
    const xhr = new XMLHttpRequest()
    xhr.open(init.method || 'POST', input.toString())

    if (init.headers) {
      const headers = init.headers as Record<string, string>
      Object.entries(headers).forEach(([key, value]) => {
        xhr.setRequestHeader(key, value)
      })
    }

    xhr.upload.onprogress = (event) => {
      if (event.lengthComputable) {
        const percent = Math.round((event.loaded / event.total) * 100)
        onProgress(percent)
      }
    }

    xhr.onload = () => {
      resolve(
        new Response(xhr.responseText, {
          status: xhr.status,
          statusText: xhr.statusText,
        }),
      )
    }

    xhr.onerror = () => reject(new Error('Network error'))
    xhr.onabort = () => reject(new DOMException('Aborted', 'AbortError'))

    if (init.signal) {
      init.signal.addEventListener('abort', () => xhr.abort())
    }

    xhr.send(init.body as XMLHttpRequestBodyInit)
  })
}