undefined: os.Chdir when compiling to wasm. Golang WASM / WASI and Tinygo WAI works fine.

[gedw99]

Hey all,

Figured its worth raising this as an issue, because its almost works :)

Its only tinygo WASM that fails.

Golang WASM and WASI works
Tinygo WASI works.

---

Full reproduction:

go version
go version go1.23.4 darwin/arm64

tinygo version
tinygo version 0.35.0 darwin/arm64 (using go version go1.23.4 and LLVM version 18.1.2)

package main

var (
	sdir      = flag.String("dir", ".", "directory for stuff")
)

func main() {
	flag.Parse()
	somedir, err := filepath.Abs(*sdir)
	if err != nil {
		log.Fatal("Directory:", err)
	}
	err = os.Chdir(somedir)
	if err != nil {
		log.Fatal("Set Directory:", err)
	}
}

--- golang wasm ---
GOOS=js GOARCH=wasm go build -o gowasm.wasm .

--- golang wasi ---
GOOS=wasip1 GOARCH=wasm go build -o gowasm.wasi .

--- tinygo wasm ---
tinygo build -o tinygo.wasm  -target wasm .
main.go:: undefined: os.Chdir

--- tinygo wasi ---
tinygo build -o tinygo.wasi -target wasi .