export interface PromptUsage {
    count: number;
    lastUsedAt: string;
}
/**
 * Tracks how often each prompt is inserted, keyed by slug, in a single JSON
 * file (`profiles/<name>/prompt-usage.json`). Kept SEPARATE from the prompt
 * entries so usage can be recorded for read-only builtin prompts without
 * copy-on-writing them into the user layer. Surfaces "recent / most-used"
 * views and a gentle search-ranking boost.
 */
export declare class PromptUsageStore {
    private readonly file;
    private cachedUsage;
    private cachedSignature;
    private readonly pendingRecords;
    private drainScheduled;
    private draining;
    constructor(file: string);
    load(): Promise<Record<string, PromptUsage>>;
    private loadInternal;
    record(slug: string, at?: string): Promise<PromptUsage>;
    get(slug: string): Promise<PromptUsage | undefined>;
    /** Slugs ordered by most-recently-used (then by count), capped at `limit`. */
    recent(limit?: number): Promise<{
        slug: string;
        usage: PromptUsage;
    }[]>;
    /** Slugs ordered by usage count (then recency), capped at `limit`. */
    top(limit?: number): Promise<{
        slug: string;
        usage: PromptUsage;
    }[]>;
    private scheduleDrain;
    private drainPending;
    private fileSignature;
}
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