switch to typescript

src/frontend/components/PreviewOverlay.vue

@@ -0,0 +1,27 @@
+<template>
+  <div class="overlay" @click="$emit('bgclick')">
+    <div class="preview">
+      <div class="img" :style="previewStyle"></div>
+    </div>
+  </div>
+</template>
+<script lang="ts">
+import { defineComponent } from 'vue'
+
+export default defineComponent({
+  name: 'preview-overlay',
+  props: {
+    img: String,
+  },
+  emits: {
+    bgclick: null,
+  },
+  computed: {
+    previewStyle (): object {
+      return {
+        backgroundImage: `url('${this.img}')`,
+      }
+    },
+  },
+})
+</script>