/**
 * Image dimensions and encoding details parsed from a file header.
 */
export interface ImageDimensions {
    /**
     * Image width in pixels.
     */
    width: number;
    /**
     * Image height in pixels.
     */
    height: number;
    /**
     * Whether the image is interlaced (progressive JPEG or Adam7 PNG).
     *
     * Interlaced images cannot be decoded with shrink-on-load, so the full
     * image must be buffered in memory at once. This matters for deciding
     * whether an image is safe to process client-side within the wasm-vips
     * memory cap.
     */
    interlaced: boolean;
}
/**
 * Reads an image's dimensions and interlacing from its header bytes.
 *
 * Only the leading bytes of the file are read, so this is cheap even for very
 * large images and never fully decodes the pixel data. Currently supports JPEG
 * and PNG, the formats most commonly affected by client-side memory limits;
 * other formats return null (treated as unknown).
 *
 * @param file The image file to inspect.
 * @return The parsed dimensions, or null if they could not be determined.
 */
export declare function getImageDimensions(file: File): Promise<ImageDimensions | null>;
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