<!-- Please provide a clear and concise description of what the bug is. Include screenshots if needed. Please test using the latest version of the relevant React packages to make sure your issue has not already been fixed. --> React version: 17.0.2 ## Steps To Reproduce 1. Create folder with '#' in name ie: mkdir myfolder/#trash/ 2. Create react app in folder: npx create-react-app myApp 3. Start app: npm start ## The current behavior Gets stuck on "Starting the development server..." forever ## The expected behavior It should start and run the app as expected when creating a new app or warn you about invalid parent directory name