GuillaumeLeon

class ClassWatcher {

    constructor(targetNode, classToWatch, classAddedCallback, classRemovedCallback) {
        this.targetNode = targetNode
        this.classToWatch = classToWatch
        this.classAddedCallback = classAddedCallback
        this.classRemovedCallback = classRemovedCallback
        this.observer = null
        this.lastClassState = targetNode.classList.contains(this.classToWatch)