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