import { UsageMetrics } from '../types/index.js';
export interface StorageProvider {
    save(metrics: UsageMetrics): Promise<void>;
    getAll(): Promise<UsageMetrics[]>;
}
export declare class JSONStorage implements StorageProvider {
    private filePath;
    constructor(filePath?: string);
    private ensureFile;
    save(metrics: UsageMetrics): Promise<void>;
    getAll(): Promise<UsageMetrics[]>;
}
//# sourceMappingURL=index.d.ts.map