/**
 * Manages stickers
 */
export declare class StickerManager {
    static readonly STICKERS_JSON: string;
    static readonly STICKER_CODE_REGEXP: RegExp;
    static stickers: {
        [code: string]: string;
    };
    constructor();
    /**
     * Load stickers from storage
     */
    static loadStickers(): void;
    /**
     * Add a sticker
     * @param code
     * @param url
     */
    static registerSticker(code: string, url: string): void;
    /**
     * Whether a sticker code is defined
     * @param code
     * @returns
     */
    static stickerExists(code: string): boolean;
    /**
     * Delete a sticker
     * @param code
     */
    static unregisterSticker(code: string): void;
    /**
     * Get a sticker URL
     * @param code
     * @returns
     */
    static getStickerUrl(code: string): string;
    /**
     * Save current sticker list to storage
     */
    static saveStickers(): void;
}