One level of a row grouping: a property path ("region"), a function (o => o.date.getFullYear()) or the full form RowGroupFieldIf.
"region"
o => o.date.getFullYear()
the row type
const groupBy: RowGroupField<Sale>[] = ["region", s => s.produkt.toUpperCase()]; Copy
const groupBy: RowGroupField<Sale>[] = ["region", s => s.produkt.toUpperCase()];
1.1.94
One level of a row grouping: a property path (
"region"), a function (o => o.date.getFullYear()) or the full form RowGroupFieldIf.