import type { APIAttachment, APIMessage, Awaitable } from 'discord.js';
/**
 * Callback used to save an image attachment.
 * The returned string is the URL that will be used in the transcript.
 *
 * `undefined` indicates to use the original attachment URL.
 * `null` indicates to not include the attachment in the transcript.
 * `string` indicates to use the returned URL as the attachment URL (base64 or remote image).
 */
export type ResolveImageCallback = (attachment: APIAttachment, message: APIMessage) => Awaitable<string | null | undefined>;
/**
 * Builder to build an image saving callback with optimization.
 */
export declare class TranscriptImageDownloader {
    private static log;
    private log;
    private maxFileSize?;
    private maxDimensions?;
    private compression?;
    private sharpModule;
    /**
     * Sets the maximum file size for *each* individual image.
     * Images larger than this will be skipped (not downloaded).
     * @param size The maximum file size in kilobytes
     */
    withMaxSize(size: number): this;
    /**
     * Sets the maximum dimensions for images. Images larger than this
     * will be resized while maintaining aspect ratio.
     * Requires `sharp` to be installed.
     * @param width Maximum width in pixels
     * @param height Maximum height in pixels
     */
    withMaxDimensions(width: number, height: number): this;
    /**
     * Sets the compression quality for each image.
     * Requires `sharp` to be installed. If sharp is not available,
     * images will be saved without compression.
     * @param quality The quality of the image (1 lowest - 100 highest)
     * @param convertToWebP Whether to convert the image to WebP format
     */
    withCompression(quality?: number, convertToWebP?: boolean): this;
    /**
     * Tries to load sharp. Returns the module or null if not available.
     */
    private loadSharp;
    /**
     * Builds the image saving callback.
     */
    build(): ResolveImageCallback;
}