Proxy handler

The proxy's handler object is a placeholder object which contains traps for proxies.

Methods

All traps are optional. If a trap has not been defined, the default behavior is to forward the operation to the target.

handler.getPrototypeOf()
A trap for Object.getPrototypeOf.
handler.setPrototypeOf()
A trap for Object.setPrototypeOf.
handler.isExtensible()
A trap for Object.isExtensible.
handler.preventExtensions()
A trap for Object.preventExtensions.
handler.getOwnPropertyDescriptor()
A trap for Object.getOwnPropertyDescriptor.
handler.defineProperty()
A trap for Object.defineProperty.
handler.has()
A trap for the in operator.
handler.get()
A trap for getting property values.
handler.set()
A trap for setting property values.
handler.deleteProperty()
A trap for the delete operator.
handler.ownKeys()
A trap for Object.getOwnPropertyNames and Object.getOwnPropertySymbols.
handler.apply()
A trap for a function call.
handler.construct()
A trap for the new operator.

Some non-standard traps are obsolete and have been removed.

Specifications

Browser compatibility

BCD tables only load in the browser

See also