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63 lines
2.4 KiB
JavaScript
63 lines
2.4 KiB
JavaScript
// Copyright (C) 2019 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-async-function-constructor-arguments
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description: Default [[Prototype]] value derived from realm of the NewTarget.
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info: |
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AsyncFunction ( p1, p2, … , pn, body )
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...
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3. Return CreateDynamicFunction(C, NewTarget, "async", args).
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Runtime Semantics: CreateDynamicFunction ( constructor, newTarget, kind, args )
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...
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9. Else if kind is "async", then
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...
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c. Let fallbackProto be "%AsyncFunction.prototype%".
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...
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18. Let proto be ? GetPrototypeFromConstructor(newTarget, fallbackProto).
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...
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GetPrototypeFromConstructor ( constructor, intrinsicDefaultProto )
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...
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3. Let proto be ? Get(constructor, "prototype").
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4. If Type(proto) is not Object, then
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a. Let realm be ? GetFunctionRealm(constructor).
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b. Set proto to realm's intrinsic object named intrinsicDefaultProto.
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5. Return proto.
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features: [async-functions, cross-realm, Reflect, Symbol]
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---*/
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var AsyncFunction = Object.getPrototypeOf(async function() {}).constructor;
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var other = $262.createRealm().global;
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var OtherAsyncFunction = Object.getPrototypeOf(other.eval('(0, async function() {})')).constructor;
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var newTarget = new other.Function();
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var fn;
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newTarget.prototype = undefined;
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fn = Reflect.construct(AsyncFunction, [], newTarget);
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assert.sameValue(Object.getPrototypeOf(fn), OtherAsyncFunction.prototype, 'newTarget.prototype is undefined');
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newTarget.prototype = null;
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fn = Reflect.construct(AsyncFunction, [], newTarget);
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assert.sameValue(Object.getPrototypeOf(fn), OtherAsyncFunction.prototype, 'newTarget.prototype is null');
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newTarget.prototype = true;
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fn = Reflect.construct(AsyncFunction, [], newTarget);
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assert.sameValue(Object.getPrototypeOf(fn), OtherAsyncFunction.prototype, 'newTarget.prototype is a Boolean');
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newTarget.prototype = '';
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fn = Reflect.construct(AsyncFunction, [], newTarget);
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assert.sameValue(Object.getPrototypeOf(fn), OtherAsyncFunction.prototype, 'newTarget.prototype is a String');
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newTarget.prototype = Symbol();
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fn = Reflect.construct(AsyncFunction, [], newTarget);
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assert.sameValue(Object.getPrototypeOf(fn), OtherAsyncFunction.prototype, 'newTarget.prototype is a Symbol');
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newTarget.prototype = 1;
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fn = Reflect.construct(AsyncFunction, [], newTarget);
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assert.sameValue(Object.getPrototypeOf(fn), OtherAsyncFunction.prototype, 'newTarget.prototype is a Number');
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