[Webkit-unassigned] [Bug 197134] Can't create a const attribute via the JSC C API

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Apr 22 10:49:35 PDT 2019


Saam Barati <sbarati at apple.com> changed:

           What    |Removed                     |Added
                 CC|                            |sbarati at apple.com

--- Comment #3 from Saam Barati <sbarati at apple.com> ---
(In reply to Sam Weinig from comment #2)
> Or, if you don't want to go the callback route, you can create the
> properties after the object has been created.
> JSObjectSetProperty(ctx, objectToAddPropertyTo,
> JSStringCreateWithUTF8CString("constantValue), JSValueMakeNumber(ctx, 7),
> kJSPropertyAttributeReadOnly | kJSPropertyAttributeDontDelete,
> &exceptionPtr);

I think this is what you want.

>From the JS spec, these things mean:
- kJSPropertyAttributeReadOnly means you can't Put to the property. E.g, if you have kJSPropertyAttributeReadOnly property "foo", "x.foo = 42" won't succeed. This makes it a "writable: false" property.
- kJSPropertyAttributeDontDelete means the property descriptor is non-configurable. E.g, "delete x.foo" will fail. So will "Object.defineProperty(x, "foo", { ... })"

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