Added demo using setup and lang="ts"

src/AppSetupSyntax.vue

@@ -0,0 +1,92 @@
+<template>
+  <div>
+    <l-map :maxBoundsViscosity="1.0" :worldCopyJump="true" style="width: 100%; height: 100%" ref="map" v-model="zoom"
+      v-model:zoom="zoom" :center="[47.41322, -1.219482]" @move="log('move')">
+      <l-tile-layer url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"></l-tile-layer>
+      <l-control-layers />
+      <l-marker :lat-lng="[0, 0]" draggable @moveend="log('moveend')">
+        <l-tooltip>
+          lol
+        </l-tooltip>
+      </l-marker>
+
+      <l-marker :lat-lng="[47.41322, -1.219482]">
+        <l-icon :icon-url="iconUrl" :icon-size="iconSize" />
+      </l-marker>
+
+      <l-marker :lat-lng="[50, 50]" draggable @moveend="log('moveend')">
+        <l-popup>
+          lol
+        </l-popup>
+      </l-marker>
+
+      <l-polyline :lat-lngs="[
+        [47.334852, -1.509485],
+        [47.342596, -1.328731],
+        [47.241487, -1.190568],
+        [47.234787, -1.358337],
+      ]" color="green"></l-polyline>
+      <l-polygon :lat-lngs="[
+        [46.334852, -1.509485],
+        [46.342596, -1.328731],
+        [46.241487, -1.190568],
+        [46.234787, -1.358337],
+      ]" color="#41b782" :fill="true" :fillOpacity="0.5" fillColor="#41b782" />
+      <l-rectangle :lat-lngs="[
+        [46.334852, -1.509485],
+        [46.342596, -1.328731],
+        [46.241487, -1.190568],
+        [46.234787, -1.358337],
+      ]" :fill="true" color="#35495d" />
+      <l-rectangle :bounds="[
+        [46.334852, -1.190568],
+        [46.241487, -1.090357],
+      ]">
+        <l-popup>
+          lol
+        </l-popup>
+      </l-rectangle>
+    </l-map>
+    <button @click="changeIcon">New kitten icon</button>
+  </div>
+</template>
+<script setup lang="ts">
+import {
+  LMap,
+  LIcon,
+  LTileLayer,
+  LMarker,
+  LControlLayers,
+  LTooltip,
+  LPopup,
+  LPolyline,
+  LPolygon,
+  LRectangle,
+} from "@vue-leaflet/vue-leaflet";
+import "leaflet/dist/leaflet.css";
+import { computed, ref } from "vue";
+
+const zoom = ref(2);
+const iconWidth = ref(25);
+const iconHeight = ref(40);
+
+const iconUrl = computed(() => {
+  return `https://placekitten.com/${iconWidth.value}/${iconHeight.value}`;
+});
+
+const iconSize = computed(() => {
+  return [iconWidth.value, iconHeight.value];
+});
+
+const log = (a) => {
+  console.log(a);
+};
+
+const changeIcon = () => {
+  iconWidth.value += 2;
+  if (iconWidth.value > iconHeight.value) {
+    iconWidth.value = Math.floor(iconHeight.value / 2);
+  }
+};
+
+</script>