I agree. That is what I settled on, basically. Thanks for the suggestion!
Will
On Fri, Dec 23, 2022 at 10:23 AM Brian Candler <b.cand...@pobox.com> wrote:
>
> I don't know how a raw Go interface value would be usable in Javascript. As
> an alternative, would it be any good to use sprintf("%T", readErr) as the
> code, and readErr.Error() as the value? At least those are both strings.
>
> https://go.dev/play/p/nd1FXUvD_zg
>
> On Friday, 23 December 2022 at 14:33:21 UTC Will Hawkins wrote:
>>
>> Hello everyone!
>>
>> First, thank you *all* (I mean this great community) for the Go language and
>> especially its support for a wasm target.
>>
>> As I was attempting to finish up a CL
>> (https://go-review.googlesource.com/c/go/+/458395) I found occasion to need
>> to great a JS Error based on a Go error. I was hoping to use the JS Error
>> constructor that includes an option object to specify a cause and value
>> (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause)
>> by using the actual go error. Here's what I was thinking:
>>
>> readErrCause := js.Global().Get("Object").New()
>> readErrCause.Set("code", readErr.Error())
>> readErrCause.Set("value", js.ValueOf(readErr))
>> readErr := js.Global().Get("Error").New("ReadFull failed", readErrCause)
>>
>> (where readErr is of the `error` type, of course)
>>
>> Unfortunately,
>> readErrCause.Set("value", js.ValueOf(readErr))
>>
>> does not work because, as the comment so perfectly says, ValueOf
>>
>> // Panics if x is not one of the expected types.
>>
>> I am absolutely up for proposing and implementing a small addition to the
>> "js package" if people think it would be helpful but I wanted to check here
>> first.
>>
>> Again, thank you for all the great work that you *all* do!!
>>
>> Sincerely,
>> Will
>>
>>
>>
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