/**
 * The eight bytes of a PNG that say how big it is.
 *
 * Separate from {@link foreignRaster}, which answers the same question by
 * decoding the whole image. That is the right cost when the pixels are wanted
 * anyway; it is the wrong one when the caller only needs to know whether two
 * captures are the same shape. A full-page route capture is nine thousand rows,
 * and a push reads twenty of them.
 */
/**
 * How large a PNG says it is, or nothing.
 *
 * `null` rather than zeroes, and rather than a throw: the caller is deciding
 * whether it can *say* something about an image, and a zero would be a claim
 * about a raster nobody read. Bytes that are not a PNG, or are too short to
 * carry a header, are not a picture of size zero — they are a picture this
 * cannot measure, and every caller has somewhere honest to put that.
 */
export declare function pngSize(bytes: Uint8Array): {
    readonly width: number;
    readonly height: number;
} | null;
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