/**
 * Class {@link UIUtil} encapsulates the utility methods related to User Interface.
 */
export default abstract class UIUtil {
    /**
     * Returns a class string consisting of the given class names. Ignores falsy values.
     * Example: classNames('foo', 0, 'bar', null, 'baz') => 'foo bar baz'
     *
     * @function
     * @param {...any} classes The class names to be combined.
     * @returns {string} The combined class string.
     */
    static classNames(...classes: any): string;
    /**
     * Generates a flat array from a tree structured data.
     *
     * @param {any[]} treeData - The tree structured data to be flattened.
     * @param {boolean} [isChild=false] - Whether the current element is a child or not.
     * @param {string} [suffix=''] - The suffix to be used for the parent id.
     * @returns {any[]} - The flattened array.
     */
    static generateFlatArrayFromTree(treeData: any[], isChild?: boolean, suffix?: string): any;
    /**
     * Converts a file to a base64 string. If onlyBinary is true, the method will return only the binary part of the base64 string.
     * @param file the file to convert
     * @param onlyBinary if true, the method will return only the binary part of the base64 string
     * @returns a promise resolved with the base64 string
     */
    static convertToBase64(file: any, onlyBinary?: boolean): Promise<unknown>;
    /**
     * Converts a base64 string to a blob.
     * @param {string} base64File The base64 string to convert.
     * @returns {Blob} The blob from the base64 string.
     */
    static convertBase64ToBlob(base64File: string, options?: any): Blob;
    static copyToClipboard(text: any): Promise<boolean>;
}