import { EventEmitter, OnChanges, SimpleChanges } from '@angular/core';
import * as i0 from "@angular/core";
export interface SortDescriptor {
    column: string | null;
    direction: 'ascending' | 'descending';
}
export declare class TableSortDirective implements OnChanges {
    sortDescriptor: SortDescriptor;
    sortChange: EventEmitter<SortDescriptor>;
    private isControlled;
    ngOnChanges(changes: SimpleChanges): void;
    setSortDescriptor(sortDescriptor: SortDescriptor): void;
    constructor();
    static ɵfac: i0.ɵɵFactoryDeclaration<TableSortDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<TableSortDirective, "sp-table[spTableSort]", never, { "sortDescriptor": "spTableSort"; }, { "sortChange": "spTableSortChange"; }, never, never, false, never>;
}