/**
 * utils.ts — Byte manipulation, MIME sniffing, and encoding helpers
 */
export declare function textEncode(str: string): Uint8Array;
export declare function textDecode(bytes: Uint8Array): string;
export declare function concatBytes(...arrays: Uint8Array[]): Uint8Array;
/** Write a 64-bit unsigned integer as 8 bytes little-endian */
export declare function writeUint64LE(value: number): Uint8Array;
/** Read a 64-bit unsigned integer from 8 bytes little-endian */
export declare function readUint64LE(bytes: Uint8Array, offset: number): number;
/** Write a 32-bit unsigned integer as 4 bytes big-endian */
export declare function writeUint32BE(value: number): Uint8Array;
/** Read a 32-bit unsigned integer from 4 bytes big-endian */
export declare function readUint32BE(bytes: Uint8Array, offset: number): number;
/** Write a 32-bit unsigned integer as 4 bytes little-endian */
export declare function writeUint32LE(value: number): Uint8Array;
/** Read a 32-bit unsigned integer from 4 bytes little-endian */
export declare function readUint32LE(bytes: Uint8Array, offset: number): number;
export declare function blobToBytes(blob: Blob): Promise<Uint8Array>;
export declare function bytesToBlob(bytes: Uint8Array, mimeType: string): Blob;
/**
 * Detect MIME type from magic bytes.
 * Falls back to the blob's declared type, then "application/octet-stream".
 */
export declare function detectMimeType(bytes: Uint8Array, blobType?: string): string;
/**
 * Append a Tier-2 trailer to arbitrary bytes.
 * Layout: [original][payload_utf8][payload_length: 8 bytes LE][magic: 8 bytes]
 */
export declare function appendTrailer(original: Uint8Array, signatureJson: string): Uint8Array;
/**
 * Detect and extract a Tier-2 trailer.
 * Returns the signature JSON and the original bytes (without trailer), or null.
 */
export declare function extractTrailer(bytes: Uint8Array): {
    signatureJson: string;
    original: Uint8Array;
} | null;
export declare function bufferEqual(a: Uint8Array, b: Uint8Array): boolean;
export declare function crc32(data: Uint8Array): number;
export declare function toZippable(files: Record<string, Uint8Array>): Record<string, [Uint8Array<ArrayBufferLike>, {
    mtime: Date;
}]>;