/** One decoded TIFF image: 8-bit chunky samples plus an optional alpha plane. */
export interface DecodedTiff {
    readonly width: number;
    readonly height: number;
    /** Samples per pixel in {@link data} — 1 (grey), 3 (RGB) or 4 (CMYK). */
    readonly channels: 1 | 3 | 4;
    /** Row-major 8-bit samples, `width * height * channels` long. */
    readonly data: Uint8Array;
    /** One byte per pixel when the file carries an alpha channel. */
    readonly alpha?: Uint8Array;
}
/** Whether the bytes open with a TIFF header (§2: `II*\0` or `MM\0*`). */
export declare function isTiff(bytes: Uint8Array): boolean;
/**
 * Decode the first image of a baseline TIFF into 8-bit chunky samples.
 *
 * @throws Error when the file is malformed or uses a feature outside baseline
 * TIFF (planar separation, JPEG/fax compression, floating-point samples).
 */
export declare function decodeTiff(bytes: Uint8Array): DecodedTiff;