Errors

interface ProviderRpcError extends Error {
  code: number
  message: string
  data?: unknown
}

try {
  await provider.request({ method: 'eth_sendTransaction', params: [tx] })
} catch (error) {
  if (error.code === 4001) return        // User cancelled
  if (error.code === 4100) return promptConnect()
  throw error
}