import { PdfFilter } from './types.js';
/**
 * Creates a pass-through filter that performs no transformation.
 * Returns data unchanged, useful for testing or as a placeholder filter.
 *
 * @returns A PdfFilter object with encode and decode methods that return data unchanged.
 *
 * @example
 * ```typescript
 * const filter = passthroughFilter()
 * const result = filter.encode(data) // Returns data unchanged
 * ```
 */
export declare function passthroughFilter(): PdfFilter;