Ag-grid: How to change define column headerName when using AggFunc?

For a given column definition, when using aggFunc the headerName appears in format func(string) - I just want the header to display the string I define. This behaviour does not exist when AggFunc is null.

const columnDef: any = {

headerName: 'Test',
field: date,
suppressMenu: true,
width: 80,
editable: true,
lockPosition: true,
type: 'numericColumn',
aggFunc: function(data) {

let sum = 0;
data.forEach( function(value) {
if (value) {
sum = sum + parseFloat(value);
}
} );
if (!sum) { return null; }

return sum.toFixed(2);
},
}


The headerName should say "test", but will instead show func(test).

https://i.sstatic.net/xHPMh.jpg

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