/** Base64 of the raw MD5 digest — the Content-MD5 wire form. */
export declare function contentMd5Base64(body: Uint8Array): string;
export declare function isObjectLockChecksumRequiredBody(status: number, body: string): boolean;
export declare function isObjectLockChecksumRequiredError(err: unknown): boolean;
export declare class ObjectLockChecksumRequiredError extends Error {
    readonly key: string;
    readonly statusCode = 400;
    readonly retryable = false;
    constructor(key: string, detail?: string);
}
/**
 * Replay a signed checksum header as-is. If the presign did not sign any
 * checksum, attach unsigned Content-MD5 (not in files-presign SignedHeaders).
 */
export declare function headersForObjectLockPut(url: string, headers: Record<string, string> | undefined, body: Uint8Array): Record<string, string>;
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