Error in Ai module in blocknote, not work with nextjs and ai-sdk

[ruimarcosjoao]

Describe the bug

When trying to use @blocknote/xl-ai in a Next.js 15.5.5 project (React 19 + Turbopack), the build fails with the following error:

Export default doesn't exist in target module

./node_modules/.pnpm/@ai-sdk+react@2.0.70_react@19.1.0_zod@4.1.12/node_modules/@ai-sdk/react/dist/index.mjs:338:1
Export default doesn't exist in target module
  336 | } from "ai";
  337 | import { useCallback as useCallback3, useId as useId2, useRef as useRef3, useState as useState2 } from "react";
> 338 | import useSWR2 from "swr";
      | ^^^^^^^^^^^^^^^^^^^^^^^^^^

The error continues with:

The export default was not found in module node_modules/swr/dist/index/react-server.mjs [app-rsc].
Did you mean to import unstable_serialize?

This breaks the build and prevents using the @blocknote/xl-ai module.

It seems that @ai-sdk/react (a dependency of @blocknote/xl-ai) is still importing SWR as a default export:

import useSWR from "swr";

but in swr@2.3.6 (and later), there is no default export, only named exports.
This causes the build to fail under ESM + Turbopack (Next.js 15).

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To Reproduce

1. Create a new Next.js 15 project (React 19, Turbopack enabled).

2. Install dependencies:

   pnpm add @blocknote/core @blocknote/mantine @blocknote/react @blocknote/xl-ai ai

3. Use the following code in app/editor/page.tsx:
   (your provided code here)

4. Run pnpm run build or next build.

Result:
Build fails with:

Export default doesn't exist in target module (swr)

---

Misc

• Node version: 22
• Package manager: pnpm
• Browser: Firefox and Edge

---

Notes / Possible Fix

• Likely cause: @ai-sdk/react imports useSWR as a default export, but swr@2.x only provides named exports.

• Possible workaround: lock SWR to version ^1.3.0.

• A long-term fix would be updating @ai-sdk/react to use:

  import { useSWR } from "swr";

• The problem only appears with Next.js 15 + React 19 + Turbopack (ESM) builds.

---

[YousefED]

Seems related to vercel/ai#8644. You could file a PR there and we'll make sure it lands to BlockNote

[sahilpohare]

What could be a workaround for now?

[nperez0111]

@sahilpohare I don't believe there is one, it is a problem with the AI SDK, perhaps you could open a PR to them to fix it?