Questions tagged [es6-proxy]
The ES2015 Proxy object allows the creation of objects with custom dispatch semantics for operations like property lookup, assignment, enumeration, invocation as a function or constructor.
es6-proxy
51
questions
16
votes
2
answers
10k
views
Why is Proxy to a Map object in ES2015 not working
I'm running the following script through Google Chrome Version 57.0.2987.133:
var loggingProxyHandler = {
"get" : function(targetObj, propName, receiverProxy) {
let ret = Reflect....
- 161
80
votes
5
answers
33k
views
How to use javascript proxy for nested objects
I have this code in js bin:
var validator = {
set (target, key, value) {
console.log(target);
console.log(key);
console.log(value);
if(isObject(target[key])){
}
return ...
- 4,575
100
votes
15
answers
37k
views
How to test if an object is a Proxy?
I would like to test if a JavaScript object is a Proxy. The trivial approach
if (obj instanceof Proxy) ...
doesn't work here, nor does traversing the prototype chain for Proxy.prototype, since all ...
- 46k
85
votes
13
answers
81k
views
How to get the target of a JavaScript Proxy?
How to access the target (which is myArray) of myProxy here?
function createProxy() {
const myArray = [Math.random(), Math.random()];
return new Proxy(myArray, {});
}
const myProxy = createProxy()...
- 5,173
12
votes
1
answer
2k
views
Why is Set Incompatible with Proxy?
JavaScript Set appears to be entirely incompatible with JavaScript proxies, attempting to Proxy() a Set()
var p = new Proxy(new Set(), {
add(target, val, receiver) {
console.log('in add: ', ...
- 3,141
59
votes
7
answers
21k
views
Can I extend Proxy with an ES2015 class?
I tried to extend Proxy, like so:
class ObservableObject extends Proxy {}
I used Babel to transpile it to ES5, and I got this error in the browser:
app.js:15 Uncaught TypeError: Object prototype may ...
- 2,023
0
votes
1
answer
522
views
Weird issue about JavaScript Proxy and getter functions
The two test cases blow both pass. I simply don't understand the behavior. It seems that JavaScript Proxy cannot trap property getting inside a getter function.
test('JS Proxy normal method', () => ...
- 20.1k
34
votes
5
answers
57k
views
Vue Array converted to Proxy object
I'm new to Vue. While making this component I got stuck here.
I'm making an AJAX request to an API that returns an array using this code:
import axios from 'axios';
export default {
data() {
...
- 505
23
votes
3
answers
15k
views
Can Babel transpile code using Proxy into ES5?
I'm using babelify version 6.3.0 set to stage 0. ES6 / ES7 are working great. However when I try to use JavaScript's proxy functionality:
set product(product={}) {
this._product = new Proxy({}, {})...
- 13.6k
17
votes
3
answers
10k
views
How to get proxy's handler from proxy object?
For example, if I have this handler/proxy (from the MDN example)...
var handler = {
get: function(target, name){
return name in target?
target[name] :
37;
}
};
...
- 3,502
37
votes
3
answers
41k
views
ES6 Proxy Polyfill for IE11
IE11 does not and will not implement ES2015 Proxy objects. Yet IE11's end of extended support is October 14, 2025.
Is there any way to polyfill Proxy objects for IE11? All other browsers support ...
- 7,741
31
votes
4
answers
10k
views
How do I trap arguments to a target method when using a Proxy object?
I'm trying to use Javascript Proxy objects to trap the arguments that are passed to a 'method' of the target that I'm proxying.
Please consider this example:
var test = {
doSomething: function() ...
- 22.7k
29
votes
2
answers
20k
views
How can I modify a constructor so that it return a proxy that prevents adding new properties to the object?
I want user to only set specific properties to an object but as the same time that object should be constructed from custom class.
For example
var row = new Row({
name : 'John Doe',
email : '...
- 4,147
18
votes
5
answers
5k
views
Major use cases for ES6 proxies
I recently got to know about ES6 proxies but I don't see a good reason to use it. I mean, everything that one could do with Proxy can be done without it, except if I'm missing something.
For example,...
- 994
10
votes
3
answers
5k
views
ES6 proxied class, access private property (Cannot read private member #hidden from an object whose class did not declare it)
Im playing around with proxy objects, classess and private properties.
And came across this error message:
/home/marc/projects/playground/pipeline/clsss.js:14
this.#hidden = !this.#hidden;
...
- 3,836