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57 lines
1.6 KiB
JavaScript
57 lines
1.6 KiB
JavaScript
// Copyright (C) 2016 the V8 project authors. 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-globaldeclarationinstantiation
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es6id: 15.1.8
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description: Declaration of lexical bindings
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info: |
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[...]
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16. For each element d in lexDeclarations do
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a. NOTE Lexically declared names are only instantiated here but not
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initialized.
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b. For each element dn of the BoundNames of d do
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i. If IsConstantDeclaration of d is true, then
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1. Perform ? envRec.CreateImmutableBinding(dn, true).
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ii. Else,
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1. Perform ? envRec.CreateMutableBinding(dn, false).
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[...]
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---*/
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// Extensibility of the global object should have no bearing on lexical
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// declarations.
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Object.preventExtensions(this);
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$262.evalScript('let test262let = 1;');
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test262let = 2;
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assert.sameValue(test262let, 2, '`let` binding is mutable');
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assert.sameValue(
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this.hasOwnProperty('test262let'),
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false,
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'property not created on the global object (let)'
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);
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$262.evalScript('const test262const = 3;');
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assert.throws(TypeError, function() {
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test262const = 4;
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}, '`const` binding is strictly immutable');
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assert.sameValue(test262const, 3, '`const` binding cannot be modified');
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assert.sameValue(
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this.hasOwnProperty('test262const'),
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false,
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'property not created on the global object (const)'
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);
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$262.evalScript('class test262class {}');
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test262class = 5;
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assert.sameValue(test262class, 5, '`class` binding is mutable');
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assert.sameValue(
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this.hasOwnProperty('test262class'),
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false,
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'property not created on the global object (class)'
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);
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