When we use a GraphQL API there are two kinds of errors we may encounter: Network Errors and GraphQL
Errors from the API. Since it's common to encounter either of them, there's a
CombinedError class that can hold and abstract either.
We may encounter a
CombinedError when using
urql wherever an
error may be returned, typically
in results from the API. The
CombinedError can have one of two properties that describe what went
networkErrorproperty will contain any error that stopped
urqlfrom making a network request.
graphQLErrorsproperty may be an array that contains normalized
GraphQLErrors as they were returned in the
errorsarray from a GraphQL API.
message of the error will be generated and combined from the errors for
It's worth noting that an
error can coexist and be returned in a successful request alongside
data. This is because in GraphQL a query can have partially failed but still contain some data.
In that case
CombinedError will be passed to us with
data may still be