import { NativeElement } from '@nonoun/native-core';
/**
 * Column header cell with optional sort toggle.
 * @attr {string} sort - Current sort state: "none" | "asc" | "desc"
 * @attr {boolean} sortable - Enables click-to-sort behavior
 * @fires native:sort - Fired on sort toggle with `{ column }` detail
 */
export declare class NTableHeader extends NativeElement {
    #private;
    static observedAttributes: string[];
    constructor();
    get column(): string;
    get sortable(): boolean;
    get sort(): string;
    set sort(val: string);
    attributeChangedCallback(name: string, old: string | null, val: string | null): void;
    setup(): void;
    teardown(): void;
}
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