Initial

resources/app/common/prosemirror/paste-transformer.mjs

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+import ProseMirrorPlugin from "./plugin.mjs";
+import { Plugin } from "prosemirror-state";
+import { randomID } from "../utils/helpers.mjs";
+import { transformSlice } from "./util.mjs";
+
+/**
+ * A class responsible for applying transformations to content pasted inside the editor.
+ */
+export default class ProseMirrorPasteTransformer extends ProseMirrorPlugin {
+  /** @override */
+  static build(schema, options={}) {
+    const plugin = new ProseMirrorPasteTransformer(schema);
+    return new Plugin({
+      props: {
+        transformPasted: plugin._onPaste.bind(plugin)
+      }
+    });
+  }
+
+  /* -------------------------------------------- */
+
+  /**
+   * Transform content before it is injected into the ProseMirror document.
+   * @param {Slice} slice      The content slice.
+   * @param {EditorView} view  The ProseMirror editor view.
+   * @returns {Slice}          The transformed content.
+   */
+  _onPaste(slice, view) {
+    // Give pasted secret blocks new IDs.
+    const secret = view.state.schema.nodes.secret;
+    return transformSlice(slice, node => {
+      if ( node.type === secret ) {
+        return secret.create({ ...node.attrs, id: `secret-${randomID()}` }, node.content, node.marks);
+      }
+    });
+  }
+}