npm run build fails in custom generated theme.
nvm usenpm run buildThe result is
npm error code E404
npm error 404 Not Found - GET https://registry.npmjs.org/string.prot.trimstart - Not found
npm error 404
npm error 404 'string.custom_theme.trimstart@1.0.8' is not in this registry.
npm error 404
npm error 404 Note that you can also install from a
npm error 404 tarball, folder, http url, or git url.
npm error A complete log of this run can be found in: /home/john/.npm/_logs/2025-06-08T06_59_03_198Z-debug-0.log
Remove package-lock.json from the distribution.
Active
5.2
Miscellaneous
The step before npm use is npm install, please verify that has be run.
I've come across this bug before. This happens when `npm install` has been run inside the `prototype` theme itself. The problem is that Drupal theme rename utility is replacing all instances of the sting "prototype" which is a reserved property name in JS. Typically deleting the `node_modules` folder and re-running the script will fix it.