Design Language
To be fair I'm reasonably sure that they meant UI Design not 'Design Language'.
And to be fair they ask you to do
npm install antd-init -g
In 'Getting Started'.
And apparently this is what you should do
A new project can be created using CLI tools.antd-init will run npm install after a project is created. If it fails, you can run npm install by yourself.$ mkdir antd-demo && cd antd-demo $ antd-init
Which is probably worth another WTF Bite.