Proxy get handler is used when evaluating the proxy

Version: v8.7.0

The defined 'not ready' error is raised when evaluating the proxy. This error does not occur in chrome or firefox consoles.

const o1 = {
      ready: false
    };

setTimeout(() => {
  o1.ready = true;
}, 1000000000);

const handler = {
  get(target, propKey, receiver) {
    if (target.ready == false) {
      throw new Error('not ready');
    } else {
      return 'ready'
    }
  }
};

const proxy = new Proxy(o1, handler);

proxy; // raises 'not ready'

I think missing from your description is that it happens in the REPL?

There are some properties that are requested during REPL evaluation of an Object. You can filter them out:

'use strict';

const util = require('util');

const o1 = {
  ready: false,
};

setTimeout(() => {
  o1.ready = true;
}, 1000000000);

const handler = {
  get(target, propKey, receiver) {
    const filter = ['inspect', util.inspect.custom, Symbol.iterator];
    if (!filter.includes(propKey)) {
      if (target.ready === false) {
        throw new Error('not ready');
      } else {
        return 'ready';
      }
    }
  },
};

const proxy = new Proxy(o1, handler);

proxy; // does not raise 'not ready'

repl: show proxies as Proxy objects

#16485 - possible solution.

yup, encountered this in repl. Thanks alot!

repl: show proxies as Proxy objects

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Proxy get handler is used when evaluating the proxy #16483

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Proxy get handler is used when evaluating the proxy #16483

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bnoordhuis commented on Oct 25, 2017

vsemozhetbyt commented on Oct 25, 2017

bnoordhuis commented on Oct 25, 2017

kuanee commented on Oct 25, 2017

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