Test run after "nvm use 20" There are some warnings, but the project originally used node.js 12 or something.
nvm use 16
npx ng serve
Modified scripts in package.json to use "npx ng" instead of ng
Angular version was wrong: npm install --save-dev @angular/[email protected]
This requires node.js version 16 or slightly earlier: nvm use 16 npx ng serve
or npm install -g @angular/[email protected] ng serve