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18ae34d8f2
Missing coverage encountered while implementing <https://github.com/tc39/ecma262/pull/3307> in SpiderMonkey. Ensure environment lookups are performed in the correct order: - keyed-destructuring-property-reference-target-evaluation-order-with-bindings.js Ensure `delete super[elem]` steps are correctly performed: - delete/super-property-topropertykey.js - delete/super-property-uninitialized-this.js Ensure ToPropertyKey for computed property names in object literals correctly performed: - object/computed-property-name-topropertykey-before-value-evaluation.js Ensure `GetSuperBase` is executed before `ToPropertKey`: - super/prop-expr-getsuperbase-before-topropertykey-* Ensure `GetThisBinding` is executed first: - super/prop-expr-uninitialized-this-*
89 lines
2.0 KiB
JavaScript
89 lines
2.0 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-destructuring-binding-patterns-runtime-semantics-propertybindinginitialization
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description: >
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Ensure correct evaluation order for binding lookups when destructuring target is var-binding.
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info: |
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14.3.3.1 Runtime Semantics: PropertyBindingInitialization
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BindingProperty : PropertyName : BindingElement
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1. Let P be ? Evaluation of PropertyName.
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2. Perform ? KeyedBindingInitialization of BindingElement with arguments value, environment, and P.
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...
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14.3.3.3 Runtime Semantics: KeyedBindingInitialization
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SingleNameBinding : BindingIdentifier Initializer_opt
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1. Let bindingId be the StringValue of BindingIdentifier.
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2. Let lhs be ? ResolveBinding(bindingId, environment).
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3. Let v be ? GetV(value, propertyName).
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4. If Initializer is present and v is undefined, then
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...
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b. Else,
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i. Let defaultValue be ? Evaluation of Initializer.
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ii. Set v to ? GetValue(defaultValue).
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...
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6. Return ? InitializeReferencedBinding(lhs, v).
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9.4.2 ResolveBinding ( name [ , env ] )
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...
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4. Return ? GetIdentifierReference(env, name, strict).
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9.1.2.1 GetIdentifierReference ( env, name, strict )
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...
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2. Let exists be ? env.HasBinding(name).
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...
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includes: [compareArray.js]
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features: [Proxy]
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flags: [noStrict]
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---*/
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var log = [];
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var sourceKey = {
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toString: () => {
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log.push("sourceKey");
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return "p";
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}
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};
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var source = {
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get p() {
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log.push("get source");
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return undefined;
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}
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};
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var env = new Proxy({}, {
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has(t, pk) {
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log.push("binding::" + pk);
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return false;
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}
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});
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var defaultValue = 0;
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var varTarget;
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with (env) {
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var {
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[sourceKey]: varTarget = defaultValue
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} = source;
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}
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assert.compareArray(log, [
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"binding::source",
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"binding::sourceKey",
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"sourceKey",
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"binding::varTarget",
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"get source",
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"binding::defaultValue",
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]);
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