Showing members of extended ts interface

If I have an interface that extends another is there a way to easily see the extended members?  I have an awful memory and being able to see what a interface inherits from its parent would be really useful.  If I have two interfaces like so:

interface Shape {

    color: string;

}

interface Square extends Shape {

    sideLength: number;

}

What I would like to see in the Square is the parents members in italics or grey or something: 

interface Square extends Shape {

    color: string;

    sideLength: number;

}

Apologies if this is the wrong place for posts like this.  I have only just started using phpStorm.

Thanks.