Interface ProxyHandler<T>

interface ProxyHandler<T> {
    apply?(target: T, thisArg: any, argArray: any[]): any;
    construct?(target: T, argArray: any[], newTarget: Function): object;
    defineProperty?(target: T, property: string | symbol, attributes: PropertyDescriptor): boolean;
    deleteProperty?(target: T, p: string | symbol): boolean;
    get?(target: T, p: string | symbol, receiver: any): any;
    getOwnPropertyDescriptor?(target: T, p: string | symbol): undefined | PropertyDescriptor;
    getPrototypeOf?(target: T): null | object;
    has?(target: T, p: string | symbol): boolean;
    isExtensible?(target: T): boolean;
    ownKeys?(target: T): ArrayLike<string | symbol>;
    preventExtensions?(target: T): boolean;
    set?(target: T, p: string | symbol, newValue: any, receiver: any): boolean;
    setPrototypeOf?(target: T, v: null | object): boolean;
}

Type Parameters

  • T extends object

Methods

apply? construct? defineProperty? deleteProperty? get? getOwnPropertyDescriptor? getPrototypeOf? has? isExtensible? ownKeys? preventExtensions? set? setPrototypeOf?

Methods

Optionalapply

  • apply(target, thisArg, argArray): any

  • A trap method for a function call.

    Parameters

    • target: T

      The original callable object which is being proxied.

    • thisArg: any
    • argArray: any[]

    Returns any

Optionalconstruct

  • construct(target, argArray, newTarget): object

  • A trap for the new operator.

    Parameters

    • target: T

      The original object which is being proxied.

    • argArray: any[]
    • newTarget: Function

      The constructor that was originally called.

    Returns object

OptionaldefineProperty

  • defineProperty(target, property, attributes): boolean

  • A trap for Object.defineProperty().

    Parameters

    • target: T

      The original object which is being proxied.

    • property: string | symbol
    • attributes: PropertyDescriptor

    Returns boolean

    A Boolean indicating whether or not the property has been defined.

OptionaldeleteProperty

  • deleteProperty(target, p): boolean

  • A trap for the delete operator.

    Parameters

    • target: T

      The original object which is being proxied.

    • p: string | symbol

      The name or Symbol of the property to delete.

    Returns boolean

    A Boolean indicating whether or not the property was deleted.

Optionalget

  • get(target, p, receiver): any

  • A trap for getting a property value.

    Parameters

    • target: T

      The original object which is being proxied.

    • p: string | symbol

      The name or Symbol of the property to get.

    • receiver: any

      The proxy or an object that inherits from the proxy.

    Returns any

OptionalgetOwnPropertyDescriptor

  • getOwnPropertyDescriptor(target, p): undefined | PropertyDescriptor

  • A trap for Object.getOwnPropertyDescriptor().

    Parameters

    • target: T

      The original object which is being proxied.

    • p: string | symbol

      The name of the property whose description should be retrieved.

    Returns undefined | PropertyDescriptor

OptionalgetPrototypeOf

  • getPrototypeOf(target): null | object

  • A trap for the [[GetPrototypeOf]] internal method.

    Parameters

    • target: T

      The original object which is being proxied.

    Returns null | object

Optionalhas

  • has(target, p): boolean

  • A trap for the in operator.

    Parameters

    • target: T

      The original object which is being proxied.

    • p: string | symbol

      The name or Symbol of the property to check for existence.

    Returns boolean

OptionalisExtensible

  • isExtensible(target): boolean

  • A trap for Object.isExtensible().

    Parameters

    • target: T

      The original object which is being proxied.

    Returns boolean

OptionalownKeys

  • ownKeys(target): ArrayLike<string | symbol>

  • A trap for Reflect.ownKeys().

    Parameters

    • target: T

      The original object which is being proxied.

    Returns ArrayLike<string | symbol>

OptionalpreventExtensions

  • preventExtensions(target): boolean

  • A trap for Object.preventExtensions().

    Parameters

    • target: T

      The original object which is being proxied.

    Returns boolean

Optionalset

  • set(target, p, newValue, receiver): boolean

  • A trap for setting a property value.

    Parameters

    • target: T

      The original object which is being proxied.

    • p: string | symbol

      The name or Symbol of the property to set.

    • newValue: any
    • receiver: any

      The object to which the assignment was originally directed.

    Returns boolean

    A Boolean indicating whether or not the property was set.

OptionalsetPrototypeOf

  • setPrototypeOf(target, v): boolean

  • A trap for Object.setPrototypeOf().

    Parameters

    • target: T

      The original object which is being proxied.

    • v: null | object

    Returns boolean

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