TS QueryResponseInitial sourceMap optional

[dvnrsn]

This happens on useQuery's initial

const {data, loading} = useQuery<HomePage>(
    QUERY,
    undefined,
    {initial},
);

Property 'sourceMap' is optional in type 'JsonifyObject<QueryResponseInitial<HomePage>>' 
but required in type 'QueryResponseInitial<HomePage>'

export declare interface QueryResponseInitial<QueryResponseResult> {
  data: QueryResponseResult
  sourceMap: ContentSourceMap | undefined

I believe this is because JsonifyObject cannot accept undefined. If I remove undefined, TS is satisfied