[webkit-changes] [WebKit/WebKit] 14d4f5: [JSC] add support for `Error.isError`

[Devin Rousso]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 14d4f53e8d772aa49d29bbf4381608a86c6944d1
      https://github.com/WebKit/WebKit/commit/14d4f53e8d772aa49d29bbf4381608a86c6944d1
  Author: Devin Rousso <hi at devinrousso.com>
  Date:   2024-10-09 (Wed, 09 Oct 2024)

  Changed paths:
    A JSTests/stress/error-isError.js
    M Source/JavaScriptCore/runtime/ErrorConstructor.cpp
    M Source/JavaScriptCore/runtime/OptionsList.h

  Log Message:
  -----------
  [JSC] add support for `Error.isError`
https://bugs.webkit.org/show_bug.cgi?id=272623

Reviewed by Yusuke Suzuki.

Similar to `Array.isArray`, this will give developers a simpler and much more reliable way to know if a given object is an `Error`.

Spec: <https://tc39.es/proposal-is-error/>
Proposal: <https://github.com/tc39/proposal-is-error>

* Source/JavaScriptCore/runtime/ErrorConstructor.cpp:
(JSC::ErrorConstructor::finishCreation):
(JSC::errorConstructorIsError): Added.

* Source/JavaScriptCore/runtime/OptionsList.h:
Add a feature flag for this.

* JSTests/stress/error-isError.js: Added.

Canonical link: https://commits.webkit.org/284879@main



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