vue-wp/vue-theme/src/utils/intersection.js

class IntersectionHandler {
    constructor() {
        this.el = null
        this.observer = null
    }
    setEl(el) {
        this.el = el
    }
    setObserver(onIntersect) {
        this.observer = new IntersectionObserver(onIntersect, {
            threshold: 0.80
        })
    }
    start() {
        this.observer.observe(this.el)
    }
}

const intersectionHandler = new IntersectionHandler()

export { intersectionHandler }