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.

Specification	Status	Comment
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Proxy Object Internal Methods and Internal Slots' in that specification.	Standard	Initial definition.
ECMAScript Latest Draft (ECMA-262) The definition of 'Proxy Object Internal Methods and Internal Slots' in that specification.	Draft	The `enumerate` handler has been removed.

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	49 [1]	18 (18)	12	36	10

Feature	Android	Chrome for Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	No support	No support	18 (18)	No support	No support	No support