I installed the angular cli with sudo npm install -g @angular/cli on my Mac (10.15.7).
But know I get the following error:
~/Workspace % ng new angular-10-app
Unknown error: TypeError [ERR_NO_ICU]: "fatal" option is not supported on Node.js compiled without ICU
Same error on windows, but only in command line (cmd.exe). Same command in power shell works.
>ng serve
Unknown error: TypeError [ERR_NO_ICU]: "fatal" option is not supported on Node.js compiled without ICU