export interface UsageStatsDocument {
    usage: {
        [itemId: string]: number[];
    };
    pinned: string[];
}
export declare const readUsageStats: (storageNamespace?: string) => UsageStatsDocument;
export declare const writeUsageStats: (doc: UsageStatsDocument, storageNamespace?: string) => void;
export declare const clearSidekickMenuUsageStats: (storageNamespace?: string) => void;
export declare const recordUsageTimestamp: (doc: UsageStatsDocument, itemId: string, now?: number) => UsageStatsDocument;