export interface CheckoutChangeDetail {
    pointsUsed: number;
    pointsDiscount: number;
    couponId: number | null;
    couponDiscount: number;
    totalDiscount: number;
    finalAmount: number;
}
/** UI SDK 事件映射表 */
export interface UiEventMap {
    'checkout:discountChanged': CheckoutChangeDetail;
    'coupon:claimed': {
        couponId: number;
    };
    'checkin:completed': {
        pointsEarned: number;
        streak: number;
    };
    'exchange:redeemed': {
        orderId: number;
        productId: number;
    };
    'auth:signedIn': {
        method: string;
    };
    'auth:signedOut': void;
    'module:opened': {
        module: string;
    };
    'module:closed': {
        module: string;
    };
}
type UiEventHandler<K extends keyof UiEventMap> = (payload: UiEventMap[K]) => void;
declare class UiEventBus {
    private handlers;
    on<K extends keyof UiEventMap & string>(event: K, handler: UiEventHandler<K>): () => void;
    once<K extends keyof UiEventMap & string>(event: K, handler: UiEventHandler<K>): () => void;
    off<K extends keyof UiEventMap & string>(event: K, handler: UiEventHandler<K>): void;
    emit<K extends keyof UiEventMap & string>(event: K, ...args: UiEventMap[K] extends void ? [] : [payload: UiEventMap[K]]): void;
}
export type { UiEventHandler };
export declare const uiEvents: UiEventBus;
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