handler.construct()

The handler.construct() method is a trap for the new operator. In order for the new operation to be valid on the resulting Proxy object, the target used to initialize the proxy must itself have a [[Construct]] internal method (i.e. new target must be valid).

Syntax

new Proxy(target, {
  construct(target, argumentsList, newTarget) {
  }
});

Parameters

The following parameters are passed to the construct() method. this is bound to the handler.

• target
  • : The target object.
• argumentsList
  • : The list of arguments for the constructor.
• newTarget
  • : The constructor that was originally called, p above.

Return value

The construct method must return an object.

Description

The handler.construct() method is a trap for the new operator.

Interceptions

This trap can intercept these operations:

• The new operator: new myFunction(...args)
• Reflect.construct()

Or any other operation that invokes the [[Construct]] internal method.

Invariants

If the following invariants are violated, the trap throws a TypeError when invoked.

• The result must be an Object.