/**
 * A minimal, self-contained progress overlay shown during `exportAsync` when
 * `showProgress` is enabled. It mounts into the grid host, needs no styles from
 * the grid stylesheet (inline styles only), and is removed when the export
 * finishes. Hidden by default — the manager only creates it on request.
 */
export declare class ProgressOverlay {
    private host;
    private root;
    private bar;
    private label;
    constructor(host: HTMLElement);
    show(): void;
    set(fraction: number): void;
    hide(): void;
}