IE8 defineProperty/getOwnPropertyDescriptor clash with shim #5

allenwb opened this Issue Feb 8, 2011 · 3 comments


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allenwb commented Feb 8, 2011

As currently implemented, the Object.defineProperty shim will not install on IE8 because IE8 already has such a method. However, the built-in IE8 method only works when applied to DOM objects.

Because the shim does not get installed, the emulation of value: property descriptors on arbitrary objects is not available although it could be. (get: and set: descriptors are a lost cause). The shim installation needs better detection of IE8 (see and should probably and the installed shim should first call the built-in method and then only call the the emulation if the built-in throws).

IE8 also has a DOM only getOwnPropertyDescriptor so the same issues apply to it.

@hax hax added a commit to hax/es5-shim that referenced this issue Jul 18, 2011
@hax hax first try to fix #5 0378e40

I think I'm having problems because of this. IE8 gives me this error: Object doesn't support this action on line 532. Has this been merged in yet?

bbqsrc commented Sep 19, 2011

Doesn't look like it was merged, sadly.


This needs a retry if anyone is up for it.

@kriskowal kriskowal closed this in 37305bc Sep 22, 2011
@samsonjs samsonjs pushed a commit to samsonjs/es5-shim that referenced this issue Sep 23, 2011
@kriskowal kriskowal Noted issue #5 9b04e6b
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