/**
 * @Author: Alex Sorafumo <alex.sorafumo>
 * @Date:   09/01/2017 12:18 PM
 * @Email:  alex@yuion.net
 * @Filename: Utility.ts
 * @Last modified by:   Alex Sorafumo
 * @Last modified time: 27/01/2017 1:32 PM
 */
export declare class Utility {
    /**
     * Replaces all instances of string in a string
     * @param str     String to replace contents
     * @param find    String to find within str
     * @param replace String to replace find in str
     * @return Returns string with all instances of find replaced with replace
     */
    static replaceAll(str: string, find: string, replace: string): string;
    /**
     * Escapes values the used to find elements
     * @param value String to escape
     * @return Returns escaped string
     */
    static escape(value: string): string;
    static contrastRatio(color1: string, color2: string): number;
    static luminanace(r: number, g: number, b: number): number;
    /**
     * Add CSS class to specified element
     * @return
     */
    static addClass(el: any, name: string): void;
    /**
     * Remove CSS class from specified element
     * @return
     */
    static removeClass(el: any, name: string): void;
    /**
     * Swaps the first CSS class for the second CSS class if it exists on the element
     * @return
     */
    static swapClass(el: any, first: string, second: string): void;
    static isIE(): boolean;
}