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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build js
package osinfo
import (
"fmt"
"syscall/js"
)
// Version returns the OS version name/number.
func Version() (string, error) {
// Version detection on Wasm varies depending on the underlying runtime
// (browser, node, etc), nor is there a standard via something like
// WASI (see https://go.dev/issue/31105). For now, attempt a few simple
// combinations for the convenience of reading logs at build.golang.org
// and local development. It's not a goal to recognize all environments.
if v, ok := node(); ok {
return "Node.js " + v, nil
}
return "", fmt.Errorf("unrecognized environment")
}
func node() (version string, ok bool) {
// Try the https://nodejs.org/api/process.html#processversion API.
p := js.Global().Get("process")
if p.IsUndefined() {
return "", false
}
v := p.Get("version")
if v.IsUndefined() {
return "", false
}
return v.String(), true
}
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