TypeScript/tests/cases/compiler/instanceofOperator.ts

<EFBFBD><EFBFBD>// Spec:
// The instanceof operator requires the left operand to be of type Any or an object type, and the right 
// operand to be of type Any or a subtype of the  Function  interface type. The result is always of the 
// Boolean primitive type.

module test {
    class Object { }
    var obj: Object;



    4 instanceof null;

    // Error and should be error
    obj instanceof 4;
    Object instanceof obj;

    // Error on left hand side
    null instanceof null;
    obj instanceof Object;
    undefined instanceof undefined;
}