title: Property '...' is declared but never used
body: <p>I have many unused params for my functions and constructors, usualy, an underscore does the trick </p>
  
  <p>1) but here I still get the error message</p>
  
  <p>I tried this (or adding an underscore)</p>
  
  <pre><code>/* tslint:disable-next-line:no-unused-variable */
  constructor(private el: ElementRef) {  }
  </code></pre>
  
  <p>with no luck</p>
  
  <p>2) how do we deal with parameters that are only used in the templates, such errors will be triggered ?</p>
  
  <p>I have to console.log to faint using a variable</p>
  
  <p>thanks</p>