getOwnPropertyDescriptor side effects
isiahmeadows at gmail.com
Thu Jan 12 01:55:13 UTC 2017
I was expecting the error to throw on invoking the getter. Calling
`Object.getOwnPropertyDescriptor` should *never* do that (spec invariant).
On Wed, Jan 11, 2017, 15:30 Boris Zbarsky <bzbarsky at mit.edu> wrote:
> On 1/11/17 3:12 PM, Isiah Meadows wrote:
> > Okay. The error stack being constructed that early is odd, though.
> I'm not sure I follow. The error stack in SpiderMonkey and V8 (and
> object is created. The captured thing is information that can be used
> to construct a stack string later.
> Then getting .stack constructs the stack string. This operation is
> somewhat expensive, so is deferred until someone asks.
> In V8, the stringification process includes an explicit
> script-modifiable hook: the "prepareStackTrace" property of the Error
> Is the odd part the stack capture during Error object construction?
> Were you expecting it to only be captured at the throw point?
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