in sample/frontend/agr-lib/src/lib/grid/agr-engine.ts [366:375]
resetFilters() {
for (const filterValue of [...this.filterColumnsData.values()]) {
const columnDefArr = Array.isArray(filterValue)?filterValue:[filterValue];
for (const columnDef of columnDefArr){
columnDef.filter = null;
}
}
this.filterColumnsData.clear();
this.filter();
}