/**
 * S3 utility functions for async operations
 */
export declare function ensureBucketExists(bucketName: string): Promise<void>;
export declare function getDefaultBucket(): string;
export declare function uploadFileToS3Async(bucket: string, fileOrData: string | Buffer, s3Path: string): Promise<void>;
export declare function deleteFileFromS3Async(bucket: string, key: string): Promise<void>;
export declare function getFileFromS3Async(bucket: string, key: string): Promise<Buffer | null>;
export declare function downloadFileFromS3Async(bucket: string, s3Key: string, localPath: string): Promise<boolean>;
export interface S3Object {
    Key: string;
    Size?: number;
    LastModified?: Date;
}
export declare function listObjectsFromS3Async(bucket: string, prefix: string): Promise<S3Object[]>;
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