/**
 * WASM compression functions for browser usage.
 *
 * Provides xzAsync, xz (callback), and xzSync (throws in browser)
 * matching the Node.js API signatures.
 */
import type { CompressionCallback, LZMAOptions } from '../types.js';
/**
 * Compress a buffer to XZ format (async, Promise-based).
 *
 * @param buffer - Data to compress (Uint8Array, ArrayBuffer, or string)
 * @param opts - Compression options (preset, check)
 * @returns Compressed XZ data
 */
export declare function xzAsync(buffer: Uint8Array | ArrayBuffer | string, opts?: LZMAOptions): Promise<Uint8Array>;
/**
 * Compress a buffer to XZ format (callback-based).
 *
 * @param buffer - Data to compress
 * @param optsOrCallback - Options or callback
 * @param callback - Callback (if opts provided)
 */
export declare function xz(buffer: Uint8Array | ArrayBuffer | string, callback: CompressionCallback): void;
export declare function xz(buffer: Uint8Array | ArrayBuffer | string, opts: LZMAOptions, callback: CompressionCallback): void;
/**
 * Synchronous XZ compression — **throws in browser**.
 *
 * Sync operations are not supported in WASM because they would block
 * the main thread. Use xzAsync() instead.
 */
export declare function xzSync(_buffer: Uint8Array | ArrayBuffer | string, _opts?: LZMAOptions): never;
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