CJS external facade doesn't account for the default export being a function

[jamesopstad]

Describe the bug

Some modules, such as node:stream export a function as the default export. When imported in an optimized dependency with the CJS external facade, require_stream should return a function with the named exports as its enumerable properties. This is the source of the error reported here - cloudflare/workers-sdk#9225.

Reproduction

https://github.com/alexanderniebuhr/cf-vite-jsonwebtoken

Steps to reproduce

Run pnpm i followed by pnpm dev.

System Info

System:
    OS: macOS 15.4.1
    CPU: (12) arm64 Apple M3 Pro
    Memory: 470.09 MB / 36.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.5.1 - ~/.nvm/versions/node/v22.5.1/bin/node
    Yarn: 1.22.22 - ~/.nvm/versions/node/v22.5.1/bin/yarn
    npm: 10.8.2 - ~/.nvm/versions/node/v22.5.1/bin/npm
    pnpm: 10.7.0 - ~/.nvm/versions/node/v22.5.1/bin/pnpm
  Browsers:
    Chrome: 136.0.7103.93
    Safari: 18.4

Used Package Manager

pnpm

Logs

TypeError: The "superCtor.prototype" property must be of type object. Received undefined

Validations

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• The provided reproduction is a minimal reproducible example of the bug.