| // 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-delete-p |
| description: > |
| If "deleteProperty" trap is null or undefined, [[Delete]] call is |
| properly forwarded to [[ProxyTarget]] (which is also a Proxy object). |
| info: | |
| [[Delete]] ( P ) |
| |
| [...] |
| 5. Let target be O.[[ProxyTarget]]. |
| 6. Let trap be ? GetMethod(handler, "deleteProperty"). |
| 7. If trap is undefined, then |
| a. Return ? target.[[Delete]](P). |
| features: [Proxy, Reflect] |
| ---*/ |
| |
| var stringTarget = new Proxy(new String("str"), {}); |
| var stringProxy = new Proxy(stringTarget, { |
| deleteProperty: null, |
| }); |
| |
| assert(!Reflect.deleteProperty(stringProxy, "length")); |
| assert.throws(TypeError, function() { |
| "use strict"; |
| delete stringProxy[0]; |
| }); |
| |
| |
| var regExpTarget = new Proxy(/(?:)/g, {}); |
| var regExpProxy = new Proxy(regExpTarget, { |
| deleteProperty: null, |
| }); |
| |
| assert(delete regExpProxy.foo); |
| assert.throws(TypeError, function() { |
| "use strict"; |
| delete regExpProxy.lastIndex; |
| }); |