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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