feat: Add extension storage (#2069)

demos/src/Experiments/ExtensionStorage/Vue/index.vue

@@ -0,0 +1,56 @@
+<template>
+  reactive storage: {{ editor?.storage.custom.foo }}
+  <editor-content :editor="editor" />
+</template>
+
+<script>
+import { Editor, EditorContent } from '@tiptap/vue-3'
+import Document from '@tiptap/extension-document'
+import Paragraph from '@tiptap/extension-paragraph'
+import Text from '@tiptap/extension-text'
+import { CustomExtension } from './CustomExtension'
+
+export default {
+  components: {
+    EditorContent,
+  },
+
+  data() {
+    return {
+      editor: null,
+    }
+  },
+
+  mounted() {
+    this.editor = new Editor({
+      extensions: [
+        Document,
+        Paragraph,
+        Text,
+        CustomExtension,
+      ],
+      content: `
+        <p>
+          This is a radically reduced version of tiptap. It has support for a document, with paragraphs and text. That’s it. It’s probably too much for real minimalists though.
+        </p>
+        <p>
+          The paragraph extension is not really required, but you need at least one node. Sure, that node can be something different.
+        </p>
+      `,
+    })
+  },
+
+  beforeUnmount() {
+    this.editor.destroy()
+  },
+}
+</script>
+
+<style lang="scss">
+/* Basic editor styles */
+.ProseMirror {
+  > * + * {
+    margin-top: 0.75em;
+  }
+}
+</style>