vanillajs-browser-helpers/addClass.mjs

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, classNames) {
    if (!Array.isArray(classNames)) {
        classNames = [classNames];
    }
    elm.classList.add(...classNames);
    return elm;
}