ElementQuery.vue

<script>
    /**
     * @link https://jsfiddle.net/adamwathan/2juusxqo/
     */
    const erd = elementResizeDetectorMaker({ strategy: 'scroll' });

    export default {
        data() {
            return {
                width: null,
                height: null,
            };
        },

        mounted() {
            erd.listenTo(this.$el, (el) => {
                this.width = el.offsetWidth;
                this.height = el.offsetHeight;
            });
        },

        render() {
            return this.$scopedSlots.default({
                width: this.width,
                height: this.height,
            });
        }
    };
</script>