The issue should have been fixed in newer fix versions e.g. 1014.0.330.
You can try removing the @types/webpack dependency and see if that fixes it for you also on the older 1014.0.213 version.
You may also need to add the "skipLibCheck": true to the compilerOptions of the tsconfig.json.
You probably have seen a message like No application for URI: upgrade-new and tenant ID....
As you are using a different name than the default apps for your application you have to build and deploy it first to the environment you are developing against.
The message should disappear then and the app should work as expected.
with the small amount of information you’ve provided it is not easy to help…
During local development you will see the stylesheets from the @c8y/style package referenced as less files, so you can easily identify the files you may need to make changes to.
Once you do a production build of your project these will be compiled into a single css file which would be called branding.<hash>.css.
If you for whatever reason still need the branding file, you can also run the local development server in production mode like this: