export type NotificationType = "info" | "warn" | "error";
export interface NotificationPayload {
    message: string;
    type?: NotificationType;
    icon?: string;
    time?: number;
    sound?: string;
}
export interface NotificationItem extends NotificationPayload {
    id: number;
    opacity: any;
    offset: any;
    layoutY: any;
    removing: boolean;
}
export declare class NotificationManager {
    stack: import('canvasengine').WritableArraySignal<NotificationItem[]>;
    private _counter;
    add(payload: NotificationPayload, engine?: {
        playSound?: (id: string) => void;
    }): void;
    remove(id: number): void;
}