fix: disableExtensions

Author: YousefED

packages/core/src/editor/BlockNoteEditor.ts

@@ -474,6 +474,12 @@ export class BlockNoteEditor<
           return ext;
         }
 
+        if (!ext.plugin) {
+          throw new Error(
+            "Extension should either be a TipTap extension or a ProseMirror plugin in a plugin property"
+          );
+        }
+
         // "blocknote" extensions (prosemirror plugins)
         return Extension.create({
           name: key,

packages/core/src/editor/BlockNoteExtensions.ts

@@ -116,7 +116,7 @@ export const getBlockNoteExtensions = <
   ret["nodeSelectionKeyboard"] = new NodeSelectionKeyboardPlugin();
 
   const disableExtensions: string[] = opts.disableExtensions || [];
-  for (const ext of Object.keys(disableExtensions)) {
+  for (const ext of disableExtensions) {
     delete ret[ext];
   }