export type XlsxImageFormat = 'png' | 'jpeg' | 'gif' | 'bmp' | 'webp' | 'tiff' | 'svg' | 'emf' | 'wmf';
/**
 * Map from image format to the Content-Types Default extension that Excel uses
 * in `[Content_Types].xml`. SVG / EMF / WMF use the same extension as the
 * format string; PNG/JPEG/GIF/BMP do too. WebP and TIFF use their canonical
 * short names.
 */
export declare const IMAGE_FORMAT_EXTENSION: Readonly<Record<XlsxImageFormat, string>>;
/** Map from image format to its IANA `image/*` MIME type. */
export declare const IMAGE_FORMAT_MIME: Readonly<Record<XlsxImageFormat, string>>;
export interface XlsxImage {
    bytes: Uint8Array;
    format: XlsxImageFormat;
    /** Pixel width. Zero when dimensions can't be determined for the format. */
    width: number;
    /** Pixel height. Zero when dimensions can't be determined for the format. */
    height: number;
    /** ZIP archive path, e.g. `xl/media/image3.png`. Set by the writer. */
    path?: string;
    /** rels-resolved id used by `<a:blip r:embed="...">`. Set by the loader. */
    rId?: string;
}
export declare function detectImageFormat(bytes: Uint8Array): XlsxImageFormat | undefined;
interface Dimensions {
    width: number;
    height: number;
}
export declare function detectImageDimensions(bytes: Uint8Array, format: XlsxImageFormat): Dimensions;
/**
 * Build an `XlsxImage` from raw bytes. Detects the format and dimensions
 * automatically. Caller may pass an explicit `format` to override detection
 * (e.g. when bytes were read from a `data:` URL with a known MIME type) or
 * `width`/`height` to skip the parser.
 */
export declare function loadImage(bytes: Uint8Array, opts?: {
    format?: XlsxImageFormat;
    width?: number;
    height?: number;
}): XlsxImage;
export {};