You can also use:

JSON.parse(JSON.stringify(Object))

if it's on your scope, it's in every Angular component, directive, etc. and it's also on every node environment.

Unless you have a circular reference, it should work and will effectively dissociate your variable reference to the original object.

Another option is to implement your own function:

/**
 * Returns a deep copy of the object
 */
public static deepCopy(oldObj: any) {
    var newObj = oldObj;
    if (oldObj && typeof oldObj === "object") {
        if (oldObj instanceof Date) {
           return new Date(oldObj.getTime());
        }
        newObj = Object.prototype.toString.call(oldObj) === "[object Array]" ? [] : {};
        for (var i in oldObj) {
            newObj[i] = this.deepCopy(oldObj[i]);
        }
    }
    return newObj;
}

This question isn't a duplicate of How can I use angular.copy in angular 2 because the OP is asking about deep copying objects. The linked answer recommends Object.assign() which doesn't make a deep copy.

Actually, using Angular2 doesn't restrict you from using other libraries like jQuery for deep copying objects with their $.clone() function or lodash with _.cloneDeep().

The most common libraries have their typings available via typings CLI tools so even when transpiling from TypeScript you can seamlessly use anything you want.

Also see: What is the most efficient way to deep clone an object in JavaScript?