@typedef {function():can-zone.ZoneSpec} can-zone.makeZoneSpec makeZoneSpec
@parent can-zone.types

A function that returns a [can-zone.ZoneSpec] object. This can be used any place where a [can-zone.ZoneSpec] is accepted.

Using a function rather than a ZoneSpec object gives you a closure where you can store local variables that will be specific to the [can-zone Zone] you are running in.

@param {can-zone.prototype.data} data The [can-zone Zone's] data object, useful when you want to append data to the Zone.

This examples wraps [document.createElement](https://developer.mozilla.org/en-US/docs/Web/API/Document/createElement) to keep count of how many elements are created, and appends the count to [can-zone.prototype.data] when the Zone ends.

```js
const mySpec = function( data ) {
	let realCreateElement, count = 0;

	return {
		beforeTask: function() {
			realCreateElement = document.createElement;
			document.createElement = function() {
				count++;
				return realCreateElement.apply( this, arguments );
			};
		},
		afterTask: function() {
			document.createElement = realCreateElement;
		},
		ended: function() {
			data.elementsCreated = count;
		}
	};
};

const zone = new Zone( mySpec );

zone.run( function() {

	// Do stuff here
} )
	.then( function( data ) {
		data.elementsCreated; // -> 5
	} );
```

@return {can-zone.ZoneSpec} A [can-zone.ZoneSpec]