title: TypeScript error: ';' expected when using "let" keyword
body: <p>I'm taking my first steps into TypeScript and discovered <code>let</code> keyword, which I found very helpful.</p>
  
  <p>However, TypeScript compiler throws <code>error TS1005: ';' expected.</code> when trying to compile the following code:</p>
  
  <pre><code>let one = 1;
  </code></pre>
  
  <p>The command I use to compile is <code>$ tsc file.tsc</code></p>
  
  <p>Any help you can provide will be great!</p>