export type UsageEntry = {
    count: number;
    lastUsed: string;
};
export type UsageData = Record<string, Record<string, UsageEntry>>;
export declare function sourceHashFor(source: string): string;
export declare class UsageStore {
    private readonly filePath;
    constructor(filePath: string);
    load(): Promise<UsageData>;
    save(data: UsageData): Promise<void>;
    record(sourceHash: string, toolName: string, now?: Date): Promise<void>;
}