Type declaration/inference in Eclipse/JSDT

Question

I would like to specify in Eclipse/JSDT the type of an instance variable as in the following example:

/**
 * @constructor
 */
function A() {
    /** @type Node */
    this.x = document.createElement("p");
}

The IDE, however, does not recognise the type of x. On the other hand, a declaration like

/** @type Node */
var x;

does work, i.e. in this case, x is known to have the type of a Node.

If I add

A.prototype.x = new Node();

to the first example, x will be known as a variable of type Node. However, this code does not run.

Answer 1

/** @type Node*/
A.prototype.x = undefined;