Add eslint type assertions rule

Fixes #3359

src/browser/Linkifier.ts

@@ -89,7 +89,7 @@ export class Linkifier implements ILinkifier {
     if (this._rowsTimeoutId) {
       clearTimeout(this._rowsTimeoutId);
     }
-    this._rowsTimeoutId = <number><any>setTimeout(() => this._linkifyRows(), Linkifier._timeBeforeLatency);
+    this._rowsTimeoutId = window.setTimeout(() => this._linkifyRows(), Linkifier._timeBeforeLatency);
   }
 
   /**