title: Angular - Module has no exported member 'OpaqueToken' Error
body: <p><a href="https://i.stack.imgur.com/iSdzD.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/iSdzD.jpg" alt="enter image description here"></a></p>
  
  <p>How should I resolve this error: </p>
  
  <blockquote>
    <p>ERROR in node_modules/@ngrx/store/src/ng2.d.ts(1,10): error TS2305: Module '"C:/Users/sandr/Desktop/wzór — kopia/node_modules/@angular/core/core"' has no exported member 'OpaqueToken'</p>
  </blockquote>
  
  <p>It's happened when I try to join (<code>@import</code>) anything with <code>@ngrx</code>.</p>