[Webkit-unassigned] [Bug 190140] New: Incorrect "name" property set for class expression without BindingIdentifier
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Mon Oct 1 09:31:57 PDT 2018
https://bugs.webkit.org/show_bug.cgi?id=190140
Bug ID: 190140
Summary: Incorrect "name" property set for class expression
without BindingIdentifier
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: JavaScriptCore
Assignee: webkit-unassigned at lists.webkit.org
Reporter: gsouza at salesforce.com
The "name" property in the constructor function for an anonymous class expression is incorrectly set to an empty string in JavaScriptCore:
// Webkit/JavaScriptCore
(class {}).hasOwnProperty('name') // true
(class extends (class A{}){}).hasOwnProperty('name') // true
(class extends(class A{}){}).name // ''
// Other spec-compliant JS engines
(class {}).hasOwnProperty('name') // false
(class extends (class A{}){}).hasOwnProperty('name') // false
(class extends(class A{}){}).name // 'A'
The ES6 spec states that SetFunctionName(value, className) should only be called when className is not undefined, which isn't the case for anonymous class expressions: http://www.ecma-international.org/ecma-262/6.0/#sec-class-definitions-runtime-semantics-evaluation
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