First Committ

src/root/My404page/My404page.ts

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+import { defineComponent } from 'vue'
+
+export default defineComponent({
+  name: 'My404page',
+  setup() {
+    return {}
+  },
+})

src/root/My404page/My404page.vue

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+<template>
+  <div>
+    Mia Pagina 404
+  </div>
+</template>
+<script lang="ts" src="./My404page.ts">
+
+</script>