Repository: create-react-app
Issue: Uncaught ReferenceError: process is not defined     at emitReadable (_stream_readable.js:529:1)     at onEofChunk (_stream_readable.js:506:1)     at readableAddChunk (_stream_readable.js:255:1)     at Readable.push (_stream_readable.js:241:1)     at index.js:423:1 emitReadable @ _stream_readable.js:529 onEofChunk @ _stream_readable.js:506 readableAddChunk @ _stream_readable.js:255 Readable.push @ _stream_readable.js:241 (anonymous) @ index.js:423 Show 5 more frames Show less
Labels: needs triage,issue: bug report

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### Describe the bug

(Write your answer here.)

### Did you try recovering your dependencies?

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  Your module tree might be corrupted, and that might be causing the issues.
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    * yarn.lock

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  We support both npm (https://npmjs.com) and yarn (https://yarnpkg.com/).
  However, **they can't be used together in one project** so you need to pick one.

  If you decided to use npm, run this in your project directory:

    npm install -g npm@latest
    npm install

  This should fix your project.

  If you decided to use yarn, update it first (https://yarnpkg.com/en/docs/install).
  Then run in your project directory:

    yarn

  This should fix your project.

  Importantly, **if you decided to use yarn, you should never run `npm install` in the project**.
  For example, yarn users should run `yarn add <library>` instead of `npm install <library>`.
  Otherwise your project will break again.

  Have you done all these steps and still see the issue?
  Please paste the output of `npm --version` and/or `yarn --version` to confirm.
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(Write your answer here.)

### Which terms did you search for in User Guide?

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  There are a few common documented problems, such as watcher not detecting changes, or build failing.
  They are described in the Troubleshooting section of the User Guide:

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  Please scan these few sections for common problems.
  Additionally, you can search the User Guide itself for something you're having issues with:

  https://facebook.github.io/create-react-app/

  If you didn't find the solution, please share which words you searched for.
  This helps us improve documentation for future readers who might encounter the same problem.
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(Write your answer here if relevant.)

### Environment

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  This enables the maintainers quickly reproduce the issue and give feedback.

  Run the following command in your React app's folder in terminal.
  Note: The result is copied to your clipboard directly.

  `npx create-react-app --info`

  Paste the output of the command in the section below.
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(paste the output of the command here.)

### Steps to reproduce

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(Write your steps here:)

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2.
3.

### Expected behavior

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(Write what you thought would happen.)

### Actual behavior

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### Reproducible demo

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    * Or, copy your app and remove things until you’re left with the minimal reproducible demo.
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(Paste the link to an example project and exact instructions to reproduce the issue.)

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