nshop-front-m/src/lib/ApolloErrorHandler.ts

import {
  CombinedGraphQLErrors,
  CombinedProtocolErrors,
  LocalStateError,
  ServerError,
  ServerParseError,
  UnconventionalError,
} from "@apollo/client/errors";

// about apollo client error handle https://www.apollographql.com/docs/react/data/error-handling
// Comprehensive error handling example.
function handleError(error: unknown) {
  if (CombinedGraphQLErrors.is(error)) {
    // Handle GraphQL errors
  } else if (CombinedProtocolErrors.is(error)) {
    // Handle multipart subscription protocol errors
  } else if (LocalStateError.is(error)) {
    // Handle errors thrown by the `LocalState` class
  } else if (ServerError.is(error)) {
    // Handle server HTTP errors
  } else if (ServerParseError.is(error)) {
    // Handle JSON parse errors
  } else if (UnconventionalError.is(error)) {
    // Handle errors thrown by irregular types
  } else {
    // Handle other errors
  }
}