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
+ // 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). We could attempt multiple
- // combinations, but for now we leave this unimplemented for
- // simplicity.
- return "", fmt.Errorf("unimplemented")
+ // 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
}