proxy.js
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proxy.js
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	import { test, summary } from './helpers.js';

	console.log('Proxy Tests\n');

	const target = { a: 1, b: 2 };
	const handler = {
	get(obj, prop) {
	return prop in obj ? obj[prop] : 'default';
	}
	};
	const proxy = new Proxy(target, handler);

	test('proxy get existing', proxy.a, 1);
	test('proxy get missing', proxy.c, 'default');

	const setHandler = {
	set(obj, prop, value) {
	obj[prop] = value * 2;
	return true;
	}
	};
	const setProxy = new Proxy({}, setHandler);
	setProxy.x = 5;
	test('proxy set', setProxy.x, 10);

	const hasHandler = {
	has(obj, prop) {
	return prop.startsWith('_') ? false : prop in obj;
	}
	};
	const hasProxy = new Proxy({ _private: 1, public: 2 }, hasHandler);
	test('proxy has public', 'public' in hasProxy, true);
	test('proxy has private', '_private' in hasProxy, false);

	const deleteHandler = {
	deleteProperty(obj, prop) {
	if (prop.startsWith('_')) return false;
	delete obj[prop];
	return true;
	}
	};
	const delProxy = new Proxy({ _keep: 1, remove: 2 }, deleteHandler);
	delete delProxy.remove;
	delete delProxy._keep;
	test('proxy delete allowed', delProxy.remove, undefined);
	test('proxy delete blocked', delProxy._keep, 1);

	const revocable = Proxy.revocable({ x: 1 }, {});
	test('revocable proxy get', revocable.proxy.x, 1);
	revocable.revoke();

	summary();