title: Ag Grid Row Style [getRowStyle]="getRowStyle" geting error as param implicit has an any
body: <p>I'm using ag-grid as</p>
  <pre class="lang-html prettyprint-override"><code>&lt;ag-grid-angular [rowStyle]=&quot;rowStyle&quot; [getRowStyle]=&quot;getRowStyle&quot;
  &lt;/ag-grid-angular&gt;
  </code></pre>
  <p>Angular code as</p>
  <pre class="lang-js prettyprint-override"><code>pubic export class Testingcomponent {
     getRowStyle = function(params) {
        if (params.node.rowIndex % 2 === 0) {
           return { background: 'red' };
        }
     };
     ...
  }
  </code></pre>
  <p>at param i'm getting error as parameter 'params' implicitly has an 'any' type</p>
  <p>i'm trying for getting alternate row colour but as per the documentation  <code>[getRowStyle]=&quot;getRowStyle&quot;</code> we are passing any parameter &amp; i'm getting error as param</p>