Please make sure you have a recent version of node and npm (bundled with node) installed.
To build the ui, perform the following steps:
npm install
npm run build
Running npm install will cause a pre-commit hook to be created. This hook ensures that if you want to commit changes to this repository, these changes are compliant with our formatting and linting rules.
If you see errors there, you can try to run npm run format:fix and npm run lint:fix to fix these issues automatically. Otherwise you have to run npm run format and npm run lint to get additional information about the problems.