title: typescript asking for template literal
body: <p>I'm using typescript, and is complaining when concatenating a string,</p>
  
  <pre><code>  const content = senderDisplay + ', '+ moment(timestamp).format('YY/MM/DD')+' at ' + moment(timestamp).format('h:mm A');
  </code></pre>
  
  <blockquote>
    <p>[tslint] Use a template literal instead of concatenating with a string
    literal. (prefer-template)</p>
  </blockquote>
  
  <p>What is the template literal to fix this? cheers</p>