Date Range filter question

[Sanideth]

Hello,

I've got weird problem here on date range filter type:

{ accessorFn: (originalRow) => { const dateString = originalRow.activationDate; return dateString ? new Date(dateString) : new Date(0); }, id: 'activationDate', header: 'Activation Date', filterVariant: 'date-range', Cell: ({ cell }) => cell.getValue<Date>() ? cell.getValue<Date>().toLocaleString() : undefined, },

my activationDate maybe null sometimes and I tried fallbacking to undefined, null and empty string (which typescript doesn't permit) in accessorFn here, but filtering gets broken then.
It needs only supports date type so I could make it work only using epoch time but is there any other way to implement the logic here, if the provided date is null or undefined?