Why is this an issue?

Creating an object without assigning it to a variable or using it in any function means the object is essentially created for no reason and may be dropped immediately without being used. Most of the time, this is due to a missing piece of code and could lead to an unexpected behavior.

If it’s intended because the constructor has side effects, that side effect should be moved into a separate method and called directly. This can help to improve the performance and readability of the code.

new MyConstructor(); // Noncompliant: object may be dropped

Determine if the objects are necessary for the code to function correctly. If they are not required, remove them from the code. Otherwise, assign them to a variable for later use.

let something = new MyConstructor();

Exceptions

• Creating new objects inside a try block is ignored.

try {
  new MyConstructor();
} catch (e) {
  /* ... */
}

• Known constructors with side effects like Notification or Vue are also ignored.

Resources

Documentation

• MDN - Object.prototype.constructor
• MDN - constructor
• MDN - new operator