mirror of https://github.com/tc39/test262.git
106 lines
2.6 KiB
JavaScript
106 lines
2.6 KiB
JavaScript
// Copyright (C) 2024 André Bargull. 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-object-environment-records-setmutablebinding-n-v-s
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description: >
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Lookups in proxy binding object for identifier reference.
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info: |
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9.1.1.2.1 HasBinding ( N )
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1. Let bindingObject be envRec.[[BindingObject]].
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2. Let foundBinding be ? HasProperty(bindingObject, N).
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3. If foundBinding is false, return false.
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...
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5. Let unscopables be ? Get(bindingObject, %Symbol.unscopables%).
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...
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7. Return true.
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9.1.1.2.6 GetBindingValue ( N, S )
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1. Let bindingObject be envRec.[[BindingObject]].
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2. Let value be ? HasProperty(bindingObject, N).
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3. If value is false, then
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a. If S is false, return undefined; otherwise throw a ReferenceError exception.
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4. Return ? Get(bindingObject, N).
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9.1.1.2.5 SetMutableBinding ( N, V, S )
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1. Let bindingObject be envRec.[[BindingObject]].
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2. Let stillExists be ? HasProperty(bindingObject, N).
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...
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4. Perform ? Set(bindingObject, N, V, S).
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...
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10.1.9.2 OrdinarySetWithOwnDescriptor ( O, P, V, Receiver, ownDesc )
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...
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2. If IsDataDescriptor(ownDesc) is true, then
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...
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c. Let existingDescriptor be ? Receiver.[[GetOwnProperty]](P).
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d. If existingDescriptor is not undefined, then
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...
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iv. Return ? Receiver.[[DefineOwnProperty]](P, valueDesc).
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...
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features: [Proxy, Reflect]
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flags: [noStrict]
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includes: [compareArray.js, proxyTrapsHelper.js]
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---*/
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var log = [];
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// Environment contains referenced binding.
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var env = {
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p: 0,
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};
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var proxy = new Proxy(env, allowProxyTraps({
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has(t, pk) {
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log.push("has:" + String(pk));
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return Reflect.has(t, pk);
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},
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get(t, pk, r) {
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log.push("get:" + String(pk));
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return Reflect.get(t, pk, r);
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},
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set(t, pk, v, r) {
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log.push("set:" + String(pk));
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return Reflect.set(t, pk, v, r);
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},
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getOwnPropertyDescriptor(t, pk) {
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log.push("getOwnPropertyDescriptor:" + String(pk));
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return Reflect.getOwnPropertyDescriptor(t, pk);
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},
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defineProperty(t, pk, d) {
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log.push("defineProperty:" + String(pk));
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return Reflect.defineProperty(t, pk, d);
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},
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}));
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with (proxy) {
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p += 1;
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}
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assert.compareArray(log, [
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// HasBinding, step 2.
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"has:p",
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// HasBinding, step 5.
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"get:Symbol(Symbol.unscopables)",
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// GetBindingValue, step 2.
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"has:p",
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// GetBindingValue, step 4.
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"get:p",
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// SetMutableBinding, step 2.
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"has:p",
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// SetMutableBinding, step 4.
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"set:p",
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"getOwnPropertyDescriptor:p",
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"defineProperty:p",
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]);
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