TypeError: Cannot read properties of undefined (reading 'prototype') when using Next.js 16 + Turbopack

[YaronRosh]

Description

I am encountering a TypeError immediately upon starting my Next.js application when twilio is imported. This issue appears to be related to how the library is bundled by Turbopack (Next.js bundler) in a dev environment.

The error disappears if I add twilio to serverExternalPackages in next.config.mjs, forcing it to be excluded from the bundle.

Steps to Reproduce

1. Initialize a Next.js 16 project.
2. Install twilio.
3. Import twilio in a server-side file (e.g., a service or API route).
4. Run the dev server with Turbopack: next dev --turbo.

Code Snippet

import twilio from 'twilio';

// The error happens immediately on import, before any code runs.
const client = twilio(accountSid, authToken);### Exception/Log

Exception/Log

TypeError: Cannot read properties of undefined (reading 'prototype')
   at <unknown> (src/server/services/chat/providers/twilio/twilio.provider.ts:1:1)
   at module evaluation (.next/dev/server/chunks/src_server_services_....js:1847:30)
> 1 | import tw*   **Twilio:** v5.10.6

• OS: macOS Darwin 25.1.0 (arm64)
• Bundler: Turbopack (--turbo)

Workaround

Adding twilio to serverExternalPackages in next.config.mjs solves the issue:

// next.config.mjs
const config = {
  serverExternalPackages: ['twilio'],
  // ...
};

Environment

• Node.js: v20.19.5
• Next.js: v16.0.1
• Twilio: v5.10.6
• OS: macOS Darwin 25.1.0 (arm64)
• Bundler: Turbopack (--turbo)

[AlonMiz]

We suffer from this issue as well...