title: Build error "Cannot find name 'Record'" with bootstrap 4
body: <p>Today, I decided to migrate my ASP .NET MVC 5 project from bootstrap 3 to bootstrap 4 (the sass version).</p>
  
  <p>After the migration, I got an error after the compilation of my project.</p>
  
  <blockquote>
    <p>Error Build:Cannot find name 'Record'.<br>
    Error Build:Cannot find name 'undefined'.</p>
  </blockquote>
  
  <p>How to solve this?</p>