instanceof on union type incorrectly issues error

[epic0tix]

The below statement does not work as it wants the left side of the instanceof statement to be of type any, which kind of defeats the purpose as once you do that TS will not longer use typegaurds, or am I missing something

constructor(template: string|templateMap){

           if (template instanceof templateMap) {
                con = super.getPaneContainer(template.selector);
            } else {
                con = super.getPaneContainer('.ui-layout-center');
            }

}

[epic0tix]

if you get the string check out of the way before you get to the instanceof check it works just fine

            if (typeof template === 'string') {
                con = super.getPaneContainer('.ui-layout-center');
            }
            else if (template instanceof templateMap) {
                con = super.getPaneContainer(template.selector);
            } else {
                con = super.getPaneContainer('.ui-layout-center');
            }

[RyanCavanaugh]

Is this a TSLint issue?

[epic0tix]

It is happening in vs2013 update 3 typescript 1.4

[RyanCavanaugh]

To simplify:

var x: string|HTMLElement;

// Error, but shouldn't be
if(x instanceof HTMLElement) {

}