"var" declarations shadowing properties from Window.prototype

Brendan Eich brendan at mozilla.com
Sun Aug 12 14:29:59 PDT 2012


Boris Zbarsky wrote:
> Note that data in 
> http://lists.w3.org/Archives/Public/public-script-coord/2012JanMar/0033.html 
> suggests that IE also implements the erratum to 5.1 we were talking 
> about up-thread.  Oh what a tangled web we weave.

Yes, current thinking is that we should take the erratum that major JS 
engines already fixed, and include it in ES6. But this means we must do 
something different in WebIDL, probably make own global properties for 
window-implements-interface-inherited attributes and even operations.

And then (for strict mode) be careful about get-only accessors. This 
reminds me of [Replaceable], which was for non-writable but configurable 
data properties that var and function must be able to replace. It's kind 
of the opposite and only for accessors: 
var-captures-own-accessor-via-detection, or some such.

Just recapping, tell me if I'm missing something.

/be


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