import type { ExtractPngChunksOptions, ReplacePngChunksOptions, TextChunk } from './specs/png-utils.nitro';
/**
 *
 * @param pngData base64 encoded PNG data
 * @returns contents of tEXt chunk
 */
export declare function extractPngTextChunk(pngData: string, options?: ExtractPngChunksOptions): import("./specs/png-utils.nitro").TextChunkResult[];
/**
 *
 * @param fileData base64 encoded PNG data
 * @param newData new tEXt chunk data
 * @returns base64 encoded PNG with tEXt chunk replaced
 */
export declare function replacePngTextChunk(fileData: string, newData: TextChunk[], options?: ReplacePngChunksOptions): string;
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