Retrieve original target object from existing proxy instance

user_1223975 0
Viewed 5849

Say I have a proxy instance like so:

const getProxy = function(){
    return new Proxy({}, ...);
}

const proxy = getProxy();

later on, I want to retrieve the target from the proxy, is there some way to do this? something like:

const target = proxy.getOriginalTarget()
es6-proxy node.js javascript
3 Answers

Just destructure it into a new object:

myNewSimpleObject = {...myProxy}

Cheers!

user_150385300

I haven't heard of standard solution, but you can build your factory function which returns new Proxy object with custom property:

function buildProxy(target, handler) {
    const proxy = new Proxy(target, handler);

    proxy.originalTarget = target;

    return proxy;
}

const test = {};
const handler = {};

buildProxy(test, handler).originalTarget === test; // true
user_20085620

One hack I've used to get around this in some circumstances is to use JSON.stringify to strip the Proxy object and then JSON.parse to return it as an object:

const test = {name: 'Proxy', test: true};
const handler = {};

const proxy = new Proxy(test, handler); // Proxy {name: "Proxy", test: true}

originalTarget = JSON.parse(JSON.stringify(proxy)); // {name: 'Proxy', test: true}

One important thing to note with this hack is that the properties of the new object can be equated to the properties of the original, but the whole object cannot, e.g:

originalTarget === test // false
originalTarget == test // false

originalTarget.name === test.name // true
originalTarget.test === test.test // true
user_93168100
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