The new keyword should only be used with objects that define a constructor function. Use it with anything else, and you'll get a TypeError because there won't be a constructor function for the new keyword to invoke.

Noncompliant Code Example

function MyClass() {
  this.foo = 'bar';
}

var someClass = 1;

var obj1 = new someClass;    // Noncompliant;
var obj2 = new MyClass();    // Noncompliant if considerJSDoc parameter set to true. Compliant when considerJSDoc=false

Compliant Solution

/**
 * @constructor
 */
function MyClass() {
  this.foo = 'bar';
}

var someClass = function(){
  this.prop = 1;
}

var obj1 = new someClass;  // Compliant
var obj2 = new MyClass();  // Compliant regardless of considerJSDoc value