message: [typings] Update MutationConfig
diff: @@ -134,9 +134,11 @@ declare module "react-relay/modern" {
  variables: Variables
  onCompleted?: ((response: T, errors: RelayNetworkTypes.PayloadError[] | null) => void) | null
  onError?: ((error: Error) => void) | null
  - optimisticResponse?: (() => Object) | null
  + // FIXME This appears to be incorrect, because Relay complains about it being a function.
  + // optimisticResponse?: (() => Object) | null
  + optimisticResponse?: Object | null
  optimisticUpdater?: ((store: RecordSourceSelectorProxy) => void) | null
  - updater?: ((store: RecordSourceSelectorProxy) => void) | null
  + updater?: ((store: RecordSourceSelectorProxy, data: T) => void) | null
  configs?: RelayMutationConfig[]
  }
  export type RecordSourceSelectorProxy = any // Todo: add proper types
  