The first thing you need to do, is grab the distribution files on NPM.
Via yarn:
yarn add @projectstorm/react-diagrams
Via npm:
npm install @projectstorm/react-diagrams
Via pnpm:
pnpm add @projectstorm/react-diagrams
When you run this in your project directory, this will install the library into ./node_modules/@projectstorm/react-diagrams. You will then find a dist folder that contains all the minified and production ready code.