generated code has incorrect type for error

[mcheng-brilliant]

The generated code collapses the different possible errors into a single error property in the response:

From the test spec:

graphql-codegen-apollo-next-ssr/test/index.spec.ts

Line 224 in 5370c8f

error: data?.error ?? data?.errors ?? null,

In that line of code:

• data?.error is of type: Apollo.ApolloError | undefined
• data?.errors is of type: ReadonlyArray<GraphQLError> | undefined
• and both are nullish coalesced into null

The resulting type should be a compound type of those possibilities. However, the generated code incorrectly types this as error?: Apollo.ApolloError:

graphql-codegen-apollo-next-ssr/test/index.spec.ts

Line 229 in 5370c8f

`export type PageFeedComp = React.FC<{data?: FeedQuery, error?: Apollo.ApolloError}>;`

Expected Behavior

• Generated code types error as Apollo.ApolloError | readonly GraphQLError[] | null.