export interface LogQLHistoryItem {
    query: string;
    usageCount: number;
    lastUsedAt: number;
}
export declare function readHistory(historyKey: string | undefined): LogQLHistoryItem[];
export declare function saveHistory(historyKey: string | undefined, query: string, now?: number): LogQLHistoryItem[];
export declare function getHistoryCompletionItems(historyKey: string | undefined): LogQLHistoryItem[];