| // 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 | |
| } | |