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syscall/js: ValueOf should not panic if the underlying type(kind) is supported #42188

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mihaiav opened this issue Oct 24, 2020 · 5 comments
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syscall/js: ValueOf should not panic if the underlying type(kind) is supported #42188

mihaiav opened this issue Oct 24, 2020 · 5 comments
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arch-wasm WebAssembly issues FeatureRequest Issues asking for a new feature that does not need a proposal. FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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Backlog

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@mihaiav
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mihaiav commented Oct 24, 2020

What version of Go are you using (go version)?

$ go version devel +dd150176c3 Fri Jul 3 03:31:29 2020 +0000 darwin/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
darwin x64

What did you do?

package main
import "syscall/js"

func main(){
type X string
x := X("hello")
v := js.ValueOf(x)
}

What did you expect to see?

x being converted to a js value.

What did you see instead?

panic: ValueOf: invalid value

I believe this is due the fact that the string value passed on is a typed. Therefore this is a feature/improvement request to make ValueOf accept values whose underlying type matches the accepted types.
@mihaiav mihaiav changed the title syscall/js ValueOf should not panic if the underlying type is supported syscall/js ValueOf should not panic if the underlying type(kind) is supported Oct 24, 2020
@dmitshur dmitshur changed the title syscall/js ValueOf should not panic if the underlying type(kind) is supported syscall/js: ValueOf should not panic if the underlying type(kind) is supported Oct 24, 2020
@dmitshur dmitshur added arch-wasm WebAssembly issues NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels Oct 24, 2020
@dmitshur dmitshur added this to the Backlog milestone Oct 24, 2020
@dmitshur dmitshur added the FeatureRequest Issues asking for a new feature that does not need a proposal. label Oct 24, 2020
@dmitshur
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CC @neelance.

@neelance
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This would require a dependency from syscall/js to reflect, which is at least something that we definitely want to avoid or maybe even impossible to do.

@dmitshur
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@neelance Have you also considered internal/reflectlite?

@neelance
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At first glance it seems like it wouldn't be able to turn type X string into a plain string.

@neelance
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neelance commented Nov 5, 2020

I'll close this issue for now, since it is very unlikely to happen due to the necessary reflect dependency. I also think that since syscall/js is a very low-level package, there need to be intermediate layers that hide it from user code and offer a nicer interface than syscall/js ever could.

@neelance neelance closed this as completed Nov 5, 2020
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arch-wasm WebAssembly issues FeatureRequest Issues asking for a new feature that does not need a proposal. FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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