$setPristine() INgModelController

Doc reference:

https://code.angularjs.org/1.2.26/docs/api/ng/type/ngModel.NgModelController

angularjs/angular.d.ts

@@ -424,6 +424,7 @@ declare module ng {
         // Documentation states viewValue and modelValue to be a string but other
         // types do work and it's common to use them.
         $setViewValue(value: any): void;
+        $setPristine(): void;
         $validate(): void;
         $setTouched(): void;
         $setUntouched(): void;