export declare class DomDocumentHelper {
    static isAvailable(): boolean;
    static getBody(): HTMLElement;
    static getDocumentElement(): HTMLElement;
    static getDocument(): Document;
    static getCookie(): string;
    static setCookie(newCookie: string): void;
    static activeElementBlur(): Document;
    static createElement(tagName: string): HTMLElement;
    static getComputedStyle(elt: Element): CSSStyleDeclaration;
    static addEventListener(type: string, listener: (e?: any) => void): void;
    static removeEventListener(type: string, listener: (e?: any) => void): void;
}
export declare class CreatorStylesManager {
    private static SurveyJSCreatorStylesSheetId;
    static Enabled: boolean;
    static findSheet(styleSheetId: string): any;
    static createSheet(styleSheetId: string): any;
    static insertStylesRulesIntoDocument(rules: Array<{
        selector: string;
        styles: string;
    }>): any;
}