/FromFactor.ts(2,15): error TS2304: Cannot find name 'StringKeyOf'.


==== /Helpers.ts (0 errors) ====
    export type StringKeyOf<TObj> = Extract<string, keyof TObj>;
    
==== /FromFactor.ts (1 errors) ====
    export type RowToColumns<TColumns> = {
        [TName in StringKeyOf<TColumns>]: any;
                  ~~~~~~~~~~~
!!! error TS2304: Cannot find name 'StringKeyOf'.
    }