$ npm install -g yarn
$ npm install -g react-scripts
$ npm install -g typescript
$ yarn run start
REACT_APP_API_URL=# URL used for api requests e.g. "https://cs-materials-api.herokuapp.com"
REACT_APP_SEARCHAPI_URL=# URL used for api requests e.g. "https://csmaterials-search.herokuapp.com"
In Debian, the apt package is call yarnpkg and the executable is also called yarnpkg. So you would run:
$ apt install yarnpkg
$ yarnpkg install
$ export REACT_APP_API_URL="https://cs-materials-api.herokuapp.com"
$ export REACT_APP_SEARCHAPI_URL="https://csmaterials-search.herokuapp.com"
$ yarnpkg start