vanillajs-browser-helpers/addClass.d.ts

Collection of convenience code snippets (helpers) that aims to make it a little easier to work with vanilla JS in the browser

/**
 * Adds one or multiple class names to a DOM element
 *
 * @param elm - HTML ELement to add class names to
 * @param classNames - Class name(s) to add
 * @return The given `elm`
 */
export default function addClass(elm: Element, classNames: string | string[]): Element;