/**
 * Read an image's pixel dimensions from its header bytes.
 *
 * Needed because the hotspot/crop model is resolution-independent but not *aspect*-independent:
 * fitting a 16:9 frame inside a crop requires knowing the source's real proportions, and a
 * normalised crop rectangle alone cannot supply them.
 *
 * Header parsing rather than a decoder: dimensions live in the first few dozen bytes of every
 * format here, so there is nothing to gain from decoding pixels and a native dependency to avoid.
 * `sharp` and `image-size`'s native paths are both ruled out by the zero-native-dependency rule,
 * and this runs identically in Node and on Workers.
 *
 * Returns `null` for anything it does not recognise — an unknown format is not an error, it just
 * means the crop editor falls back to the browser's own idea of the aspect ratio.
 */
export interface ImageDimensions {
    width: number;
    height: number;
}
export declare function readImageDimensions(bytes: Uint8Array): ImageDimensions | null;