Repository: create-react-app
Issue: ESM Web Worker Importing CommonJS Module Failure [Only in Production]
Labels: needs triage,issue: bug report

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### Describe the bug

I have a project that uses a forked version of [ffmpeg.wasm](https://github.com/ffmpegwasm/ffmpeg.wasm). The project is packaged using `npm pack` and the resulting .tgz file is used to install ffmpeg. When I use this package in a web worker using ESM import.
`import { createFFmpeg } from "@ffmpeg/ffmpeg";`  everything is fine in development. However after running `npm run build` and serving the app using `python3 -m http.server 3000` the worker crashes with this error:
![error](https://user-images.githubusercontent.com/50880261/163258903-aaa3fc8f-10fd-4c4a-b864-e6164bfeed2c.png)

### Did you try recovering your dependencies?

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Yes
### Which terms did you search for in User Guide?

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"ES Modules may not"
### Environment

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```
Environment Info:

  current version of create-react-app: 5.0.1
  running from C:\Users\nayja\AppData\Local\npm-cache\_npx\c67e74de0542c87c\node_modules\create-react-app

  System:
    OS: Windows 10 10.0.19044
    CPU: (4) x64 Intel(R) Core(TM) i3-8130U CPU @ 2.20GHz    
  Binaries:
    Node: 17.8.0 - C:\Program Files\nodejs\node.EXE
    Yarn: Not Found
    npm: 8.5.5 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Chrome: 100.0.4896.88
    Edge: Spartan (44.19041.1266.0), Chromium (100.0.1185.39)
    Internet Explorer: 11.0.19041.1566
  npmPackages:
    react: ^18.0.0 => 18.0.0 
    react-dom: ^18.0.0 => 18.0.0 
    react-scripts: 5.0.1 => 5.0.1 
  npmGlobalPackages:
    create-react-app: Not Found
```

### Steps to reproduce

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1. Create a react app using `npx create-react-app app --template typescript`
2. Install ffmpeg.wasm [from](https://github.com/nxtexe/cra-issue/blob/main/ffmpeg-ffmpeg-0.10.2.tgz)
3. Instantiate ffmpeg inside a web worker using createFFmpeg (imported with ESM syntax)
4. Instantiate said web worker with type "module"
5. Run `npm run build` and serve the resulting index.html

### Expected behavior

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1. FFmpeg.wasm should be instantiated with no errors.
2. FFmpeg should log `[info] use ffmpeg.wasm v0.10.2` to the console.

### Actual behavior

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1. The web worker crashes
2. This error is logged to the console: ![error](https://user-images.githubusercontent.com/50880261/163258903-aaa3fc8f-10fd-4c4a-b864-e6164bfeed2c.png)

### Reproducible demo

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[A minimal reproducible demo](https://github.com/nxtexe/cra-issue)

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