| // Copyright (C) 2019 Leo Balter. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-weak-ref.prototype.deref |
| description: Throws a TypeError if this is not an Object |
| info: | |
| WeakRef.prototype.deref () |
| |
| 1. Let weakRef be the this value. |
| 2. If Type(weakRef) is not Object, throw a TypeError exception. |
| 3. If weakRef does not have a [[Target]] internal slot, throw a TypeError exception. |
| 4. Let target be the value of weakRef.[[Target]]. |
| 5. If target is not empty, |
| a. Perform ! KeepDuringJob(target). |
| b. Return target. |
| 6. Return undefined. |
| features: [WeakRef] |
| ---*/ |
| |
| assert.sameValue(typeof WeakRef.prototype.deref, 'function'); |
| |
| var deref = WeakRef.prototype.deref; |
| |
| assert.throws(TypeError, function() { |
| deref.call(undefined); |
| }, 'undefined'); |
| |
| assert.throws(TypeError, function() { |
| deref.call(null); |
| }, 'null'); |
| |
| assert.throws(TypeError, function() { |
| deref.call(true); |
| }, 'true'); |
| |
| assert.throws(TypeError, function() { |
| deref.call(false); |
| }, 'false'); |
| |
| assert.throws(TypeError, function() { |
| deref.call(1); |
| }, 'number'); |
| |
| assert.throws(TypeError, function() { |
| deref.call('object'); |
| }, 'string'); |
| |
| var s = Symbol(); |
| assert.throws(TypeError, function() { |
| deref.call(s); |
| }, 'symbol'); |