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Version: 3.27.2

handler.getPrototypeOf()

The handler.getPrototypeOf() method is a trap for the [[GetPrototypeOf]] internal method.

Syntax​

new Proxy(obj, {
  getPrototypeOf(target) {
    // …
  }
});

Parameters​

The following parameter is passed to the getPrototypeOf() method. this is bound to the handler.

  • target
    • : The target object.

Return value​

The getPrototypeOf() method must return an object or null.

Description​

Interceptions​

This trap can intercept these operations:

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

Invariants​

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

  • getPrototypeOf() method must return an object or null.
  • If target is not extensible, Object.getPrototypeOf(proxy) method must return the same value as Object.getPrototypeOf(target).