May the defineProperty method of a proxy handler throw a TypeError?
dflanagan at mozilla.com
Wed May 25 11:30:36 PDT 2011
I'm using a proxy to implement the DOM NodeList interface. A NodeList
object is array-like and has read-only, non-configurable array index
In my handler's set() and delete() methods, I just return false if an
attempt is made to set or delete an indexed property.
The defineProperty() method is not parallel to set() and delete(),
however. I can't just return false, since the return value is ignored.
And I can't tell from the proposal whether I am allowed to throw a
TypeError from this method. In getOwnPropertyDescriptor() I know that I
have to lie and return a descriptor with configurable:true for the
indexed properties. So in defineProperty() should I just silently ignore
any attempts to set an indexed property, or should I actively reject
those attempts with a TypeError?
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