Alternative yarn for iran in case default registiry is not accesseble for various reasons.
Sometimes you need to install a package and there are network errors with yarn add so iyarn would come handy here to install your package quickly without changing yarn repository and create .npmrc and commit it to your project or using VPN or other methods.
npm install yarn iyarn -gthen add your package of choice with iyarn.
iyarn add react react-domalso you can use it without installing iyarn:
npx iyarn add react