mirror of https://github.com/tc39/test262.git
45 lines
1.1 KiB
JavaScript
45 lines
1.1 KiB
JavaScript
// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-proxy-object-internal-methods-and-internal-slots-hasproperty-p
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description: >
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If "has" trap is null or undefined, [[HasProperty]] call is properly
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forwarded to [[ProxyTarget]] (which is also a Proxy object).
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info: |
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[[HasProperty]] ( P )
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[...]
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5. Let target be O.[[ProxyTarget]].
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6. Let trap be ? GetMethod(handler, "has").
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7. If trap is undefined, then
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a. Return ? target.[[HasProperty]](P).
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features: [Proxy, Symbol, Reflect, Array.prototype.includes]
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---*/
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var stringTarget = new Proxy(new String("str"), {});
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var stringProxy = new Proxy(stringTarget, {
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get: null,
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});
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assert(Reflect.has(stringProxy, "length"));
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assert(0 in stringProxy);
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assert(!(4 in stringProxy));
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var sym = Symbol();
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var target = new Proxy({}, {
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has: function(_target, key) {
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return [sym, "6", "foo"].includes(key);
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},
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});
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var proxy = new Proxy(target, {
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get: null,
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});
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assert(Reflect.has(proxy, sym));
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assert("6" in proxy);
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assert("foo" in Object.create(proxy));
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assert(!("bar" in proxy));
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