import { IImageOptions } from "docx";
import { IDefaultImagePluginOptions } from ".";
/**
 * Determines the MIME type of an image buffer using file signature detection.
 *
 * @param buffer - Binary image data as a Buffer or ArrayBuffer.
 * @returns Detected MIME type, or `undefined` if unknown.
 */
export declare const getImageMimeType: (buffer: Buffer | ArrayBuffer) => "bmp" | "png" | "jpg" | "gif" | undefined;
/**
 * Generates and returns a placeholder image.
 * If a placeholder source is defined, attempts to resolve it; otherwise returns an empty fallback.
 *
 * @param options - Image plugin configuration.
 * @returns Image options for the placeholder.
 */
export declare const getPlaceHolderImage: (options: IDefaultImagePluginOptions) => Promise<IImageOptions>;