Web workers do not work when runtime is edge

### Link to the code that reproduces this issue https://github.com/jauniusmentimeter/reproduction-app ### To Reproduce 1. Start the application with next dev command 2. Open the page http://localhost:3000 3. The error "document is not defined is returned from the server" 4. Open `app/page.tsx` and change runtime to `nodejs` instead of `edge`. The error is not returned anymore. ### Current vs. Expected behavior Web workers do not work when runtime is set to edge. They should work in the same way as on nodejs runtime, since they are running on the client. ### Provide environment information ```bash Operating System: Platform: darwin Arch: arm64 Version: Darwin Kernel Version 23.5.0: Wed May 1 20:14:38 PDT 2024; root:xnu-10063.121.3~5/RELEASE_ARM64_T6020 Available memory (MB): 16384 Available CPU cores: 10 Binaries: Node: 20.11.0 npm: 9.5.1 Yarn: 1.22.21 pnpm: 9.5.0 Relevant Packages: next: 15.0.0-canary.72 // Latest available version is detected (15.0.0-canary.72). eslint-config-next: N/A react: 19.0.0-rc.0 react-dom: 19.0.0-rc.0 typescript: 5.3.3 Next.js Config: output: N/A ``` ### Which area(s) are affected? (Select all that apply) Runtime, Webpack ### Which stage(s) are affected? (Select all that apply) next dev (local), next build (local), next start (local), Vercel (Deployed) ### Additional context For some reason document is trying to be accessed on server environment when web worker code exist: <img width="1021" alt="image" src="https://github.com/user-attachments/assets/1f2f4d0d-b642-4308-a6ff-47c05894370f"> here is the place in `.next/server/edge-runtime-webpack.js` that is failing: <img width="704" alt="image" src="https://github.com/user-attachments/assets/8312efc0-6373-48e6-af86-96d44c7b7921">