Function createFetchNetworkErrorMessage

src/utils/http.ts:79–90

(error: unknown)

/** 将网络错误转为用户可读的中文消息，非网络错误返回 null */
export function createFetchNetworkErrorMessage(error: unknown): string | null {
  if (isFetchTimeoutError(error)) return '请求超时'
  if (!(error instanceof Error)) return null

  const code = getErrorCode(error)
  if (code === 'ENOTFOUND' || code === 'EAI_AGAIN') return '域名解析失败'
  if (code.startsWith('CERT_') || code.includes('SSL') || code.includes('TLS')) return '证书错误'
  if (code === 'ECONNREFUSED') return '连接被拒绝'
  if (code === 'ETIMEDOUT') return '请求超时'

  return null
}

function getErrorCode(error: unknown): string {
  const cause = error instanceof Error && 'cause' in error ? (error as { cause?: unknown }).cause : null