TypeScript/tests/baselines/reference/instanceofOperator.js

//// [instanceofOperator.ts]
// 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.

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;



//// [instanceofOperator.js]
// 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.
var Object = (function () {
    function Object() {
    }
    return Object;
})();
var obj;
4 instanceof null;
obj instanceof 4;
Object instanceof obj;
null instanceof null;
obj instanceof Object;
undefined instanceof undefined;