interface TileDataSource {
    base64Image: string;
}
/**
 * Stitches individual tile images into a PNG buffer.
 * @param tiles - Array of objects containing base64 encoded PNG image data.
 * @param tileSize - The width/height of each square tile (e.g., 16).
 * @param columns - The number of columns in the spritesheet grid.
 * @returns A Promise resolving to the Buffer of the generated PNG spritesheet.
 */
export declare function stitchTileset(tiles: TileDataSource[], tileSize: number, columns: number): Promise<Buffer>;
export {};