npm i -g yarn
yarn set version berry
yarn 또는 yarn instal
yarn dlx @yarnpkg/sdks vscode
//typescript 사용시
yarn plugin import typescript
yarn add -D typescript
.yarn/*
!.yarn/cache
!.yarn/patches
!.yarn/plugins
!.yarn/releases
!.yarn/sdks
!.yarn/versions
yarn add 패키지명
yarn add -D 패키지명 // dev