import fs from 'fs';
import { ClientOption } from '../../types';
/**
 * Class for compiling information about image
 */
export declare class ImageAssets {
    /**
     * Image base URL of mihoyo
     */
    private static readonly IMAGE_BASE_URL_MIHOYO;
    /**
     * Image types
     */
    private static readonly imageTypes;
    /**
     * Fetch option
     */
    private static fetchOption;
    /**
     * Image base URL by regex
     */
    private static imageBaseURLByRegex;
    /**
     * Default image base URL
     */
    private static defaultImageBaseURL;
    /**
     * Whether to cache the image
     */
    private static autoCacheImage;
    /**
     * Image folder path
     */
    private static imageFolderPath;
    /**
     * Image name
     */
    readonly name: string;
    /**
     * Image base URL
     */
    readonly imageBaseURL: string;
    /**
     * Image URL
     */
    readonly url: string;
    /**
     * Image type
     */
    readonly imageType: string | null;
    /**
     * Image URL of mihoyo
     */
    readonly mihoyoURL: string;
    /**
     * Classes for handling images
     * @param name Image name
     * @param url Image URL(Basically, no need to specify)
     */
    constructor(name: string, url?: string);
    /**
     * Create a ImageAssets instance from the image URL
     * @param url Image URL
     * @returns ImageAssets instance
     */
    static fromURL(url: string): ImageAssets;
    /**
     * Classes for handling images
     * @param option Client option
     */
    static deploy(option: ClientOption): void;
    /**
     * Fetch image buffer
     * @returns Image buffer
     */
    fetchBuffer(): Promise<Buffer>;
    /**
     * Fetch image stream
     * @param highWaterMark HighWaterMark
     * @returns Image stream
     */
    fetchStream(highWaterMark?: number): Promise<fs.ReadStream>;
    /**
     * Check if the PNG file is corrupted
     * @warning This function is not perfect, so it may not be able to detect all corrupted files. because it only checks the PNG signature and IEnd chunk.
     * @param filePath File path
     * @returns is PNG file corrupted
     */
    private isPNGCorrupted;
}