import { EventEmitter } from '@angular/core';
import { SortHeaderDirective } from './sort-header.directive';
import { SortState } from './tables.types';
export declare class SortDirective {
    readonly sortChange: EventEmitter<SortState>;
    headers: Map<string, SortHeaderDirective>;
    register(sortHeader: SortHeaderDirective): void;
    deregister(sortHeader: SortHeaderDirective): void;
    onSort(state: {
        column: string;
        direction: 'asc' | 'desc' | '';
    }): void;
}