/**
 * Just enough PNG to know how big an image is.
 *
 * Hand-written rather than pulled from an image library, and the distinction is
 * the one the repository's conventions draw: decoding a PNG is somebody else's
 * solved problem, and reading the eight bytes of its header is not decoding. The
 * alternative here is `sharp`, which is libvips — a native binary, a peer
 * dependency and a hundred megabytes — to answer a question the file states in
 * its first twenty-four bytes.
 *
 * It refuses anything that is not a PNG rather than guessing, because that
 * refusal is itself one of the rules (`pngOnly`).
 */
export interface PngSize {
    width: number;
    height: number;
}
/**
 * The dimensions of a PNG, or `null` if the bytes are not one.
 *
 * `null` rather than a throw: the caller is validating a whole pass and wants
 * every problem at once, not the first one.
 */
export declare function readPngSize(bytes: Uint8Array): PngSize | null;
//# sourceMappingURL=png.d.ts.map