import { PdfFilter } from './types.js';
/**
 * Creates an ASCII85 filter for encoding and decoding PDF stream data.
 * ASCII85 (also known as Base85) encodes binary data into ASCII characters,
 * resulting in a 25% expansion compared to the original data.
 *
 * @returns A PdfFilter object with encode and decode methods.
 *
 * @example
 * ```typescript
 * const filter = ascii85()
 * const encoded = filter.encode(binaryData)
 * const decoded = filter.decode(encoded)
 * ```
 */
export declare function ascii85(): PdfFilter;