import type { IImageOptions } from "docx";
import type { IPlugin, Optional } from "@m2d/core";
/**
 * A function that resolves an image source into a `docx`-compatible image options object.
 *
 * @param src - Image source, either a base64-encoded string or URL.
 * @param options - Plugin options used during image resolution.
 * @returns Promise resolving to image options used in DOCX generation.
 */
export type ImageResolver = (src: string, options: IDefaultImagePluginOptions, isPlaceholder?: boolean) => Promise<IImageOptions>;
/**
 * Configuration options for the image plugin.
 */
export interface IDefaultImagePluginOptions {
    /**
     * Scaling factor applied to base64 images to simulate resolution.
     *
     * @default 3
     */
    scale: number;
    /**
     * Fallback image format for unsupported or unrecognized types.
     *
     * @default "png"
     */
    fallbackImageType: "png" | "jpg" | "bmp" | "gif";
    /**
     * Custom function to resolve image sources into DOCX image options.
     */
    imageResolver: ImageResolver;
    /**
     * Maximum allowed image width in inches.
     */
    maxW: number;
    /**
     * Maximum allowed image height in inches.
     */
    maxH: number;
    /**
     * Placeholder Image Src
     */
    placeholder?: string;
    /**
     * Target DPI (dots per inch) to calculate dimensions from pixels.
     */
    dpi: number;
}
/**
 * Optional configuration input for the plugin constructor.
 * The `dpi` field is managed internally and excluded.
 */
type IImagePluginOptions = Optional<Omit<IDefaultImagePluginOptions, "dpi">>;
/**
 * 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;
/**
 * Image plugin for processing inline image nodes in the Markdown AST.
 * Resolves both base64 and URL-based images for inclusion in DOCX.
 *
 * @param options - Optional image plugin configuration.
 * @returns Plugin implementation for use in the `@m2d/core` pipeline.
 */
export declare const imagePlugin: (options?: IImagePluginOptions) => IPlugin;
export {};