added missing .isRetina property

angular-media-queries/match-media-tests.ts

@@ -10,6 +10,11 @@ myApp.controller('TestController', ($log: angular.ILogService,
         $log.info(`Result: ${result}`);
     }
     
+    // '.isRetina' examples
+    if(screenSize.isRetina) {
+        $log.info("Retina screen detected")
+    }
+    
     // '.is(...)' examples
     var res = screenSize.is(["xs", "sm"]);
     fnCallback(res);

angular-media-queries/match-media.d.ts

@@ -8,6 +8,9 @@ declare namespace angular.matchmedia {
 
     interface IScreenSize {
 
+        // Returns a value indicating if the current device has a retina screen
+        isRetina: boolean;
+    
         is(list: Array<string> | string): boolean;
 
         // Executes the callback function on window resize with the match truthiness as the first argument.