Yarn is a package manager for your code.

https://yarnpkg.com

alternativa a Bower

Specificare la versione di .netcore in un progetto asp.net core

alll'interno del file .csproj può essere specificata la corretta versione del runtime

<PropertyGroup>
  <RuntimeFrameworkVersion>2.0.0</RuntimeFrameworkVersion>
  <PublishWithAspNetCoreTargetManifest>false</PublishWithAspNetCoreTargetManifest>
    <TargetFramework>netcoreapp2.0</TargetFramework>
  </PropertyGroup>
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