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Added app name as hash salt for css modules ident

Open Administrator requested to merge github/fork/pstrh/pr/increase-css-module-hash-uniqueness into main

Created by: pstrh

Fixes CSS Module class name collisions (#9134 and #10190) by adding the app name as a hash salt. The change preserves #6875 (closed). The css module hash is stable within the project but globally unique (as long as the app name is unique).

Test steps:

  • Create an application
  • Create a App.module.css, import and use it in App.js
  • Start the application and check the generated hash
  • Stop the application and change appName in package.json
  • Start the application and check the generated hash

Previous: The generate css module hash stays the same.

Now: The generate css module hash changes as the app name has been changed.

Please let me know if you need more information.