import { ReelSymbol } from './ReelSymbol.js';
/**
 * A {@link ReelSymbol} that renders nothing and never animates.
 *
 * Register it for an id that needs to occupy a grid slot without producing
 * any visual - the blank rest state of a {@link HoldAndWinBoard} cell, a
 * cascade "hole", a dry-run symbol-set placeholder. The {@link HoldAndWinBuilder}
 * auto-registers one under its `emptyId` so callers never have to.
 */
export declare class EmptySymbol extends ReelSymbol {
    protected onActivate(_symbolId: string): void;
    protected onDeactivate(): void;
    playWin(): Promise<void>;
    stopAnimation(): void;
    resize(_width: number, _height: number): void;
}
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