import { SpinningMode } from './SpinningMode.js';
/**
 * Cascade/tumble spinning mode.
 * Symbols fall from above with gravity-like acceleration,
 * used for tumble/avalanche mechanics.
 */
export declare class CascadeMode implements SpinningMode {
    readonly name = "cascade";
    private _gravity;
    /**
     * @param gravity - Gravity acceleration factor. Default: 1.5.
     */
    constructor(gravity?: number);
    computeDeltaY(symbolHeight: number, speed: number, deltaMs: number): number;
}
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