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packages/frontend/src/directives/container.ts

@@ -0,0 +1,21 @@
+import { Directive } from 'vue';
+
+const map = new WeakMap<HTMLElement, ResizeObserver>();
+
+export default {
+	mounted(el: HTMLElement, binding, vn) {
+		const ro = new ResizeObserver((entries, observer) => {
+			el.style.setProperty('--containerHeight', el.offsetHeight + 'px');
+		});
+		ro.observe(el);
+		map.set(el, ro);
+	},
+
+	unmounted(el, binding, vn) {
+		const ro = map.get(el);
+		if (ro) {
+			ro.disconnect();
+			map.delete(el);
+		}
+	},
+} as Directive;