interface S3Config {
    region: string;
    bucketName: string;
    expirationSeconds: number;
    endpoint?: string;
    credentials?: {
        accessKeyId: string;
        secretAccessKey: string;
    };
    forcePathStyle?: boolean;
}
interface UploadResult {
    success: boolean;
    url?: string;
    key?: string;
    error?: string;
}
/**
 * Uploads a file to S3 and returns a private, time-limited URL to access it
 * @param filePath - Absolute or relative path to the file to upload
 * @param config - S3 configuration parameters
 * @returns Promise containing the result with URL if successful
 */
export declare function upload(id: string, filePath: string, config: S3Config, progressCb?: Function | null): Promise<UploadResult>;
export type { UploadResult, S3Config };