...
export enum PropheticErrorCode {
  NotAProphetError = 'NOT_A_PROPHET',
  ProphetNotFoundWithId = "CAN_NOT_FIND_PROPHET"
}
...
export const errorHere = (error: ApolloError | GraphQLError | undefined ) => { ... }
export const isThis = (error: ApolloError | GraphQLError | undefined) => { ... }