diff --git a/tsconfig.json b/tsconfig.json
index 6c285dd..b1c1077 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -14,6 +14,19 @@
     "types": ["vite/client", "node"],
     "baseUrl": ".",
     "paths": {
+      // Our own node_modules holds a uniform @tiptap/* set (3.32.2). The shared
+      // @k6n/cms-editor sources below resolve tiptap from the backoffice tree,
+      // which mixes core 3.30.2 with a nested markdown 3.32.2 whose Extension
+      // type is no longer assignable to the older core's `Extensions` - that
+      // version drift broke `tsc --noEmit` (first step of `npm run build`).
+      // Pin the check to our uniform set. Vite does not read tsconfig paths
+      // (it aliases @k6n/cms-editor manually), so bundling is untouched.
+      "@tiptap/core": ["./node_modules/@tiptap/core"],
+      "@tiptap/pm": ["./node_modules/@tiptap/pm"],
+      "@tiptap/pm/*": ["./node_modules/@tiptap/pm/*"],
+      "@tiptap/starter-kit": ["./node_modules/@tiptap/starter-kit"],
+      "@tiptap/extension-image": ["./node_modules/@tiptap/extension-image"],
+      "@tiptap/markdown": ["./node_modules/@tiptap/markdown"],
       "@k6n/cms-editor": [
         "../backoffice/web/packages/cms-editor/src/index.ts",
         "../ecommerce/backoffice/web/packages/cms-editor/src/index.ts",