diff --git a/term_unix.go b/term_unix.go
index 251a04f..7ee5e0d 100644
--- a/term_unix.go
+++ b/term_unix.go
@@ -1,4 +1,4 @@
-//go:build !windows
+//go:build !js && !wasip1 && !windows
 
 package term
 
diff --git a/term_unsupported.go b/term_unsupported.go
new file mode 100644
index 0000000..539064a
--- /dev/null
+++ b/term_unsupported.go
@@ -0,0 +1,56 @@
+//go:build js || wasip1
+
+package term
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"runtime"
+)
+
+// terminalState holds the platform-specific state / console mode for the terminal.
+type terminalState struct{}
+
+func stdStreams() (stdIn io.ReadCloser, stdOut, stdErr io.Writer) {
+	return os.Stdin, os.Stdout, os.Stderr
+}
+
+func getFdInfo(in any) (uintptr, bool) {
+	if file, ok := in.(*os.File); ok {
+		return file.Fd(), false
+	}
+	return 0, false
+}
+
+func getWinsize(fd uintptr) (*Winsize, error) {
+	return nil, fmt.Errorf("terminal: GetWinsize not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
+}
+
+func setWinsize(fd uintptr, ws *Winsize) error {
+	return fmt.Errorf("terminal: SetWinsize not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
+}
+
+func isTerminal(fd uintptr) bool {
+	return false
+}
+
+func restoreTerminal(fd uintptr, state *State) error {
+	return fmt.Errorf("terminal: RestoreTerminal not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
+}
+
+func saveState(fd uintptr) (*State, error) {
+	return nil, fmt.Errorf("terminal: SaveState not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
+}
+
+func disableEcho(fd uintptr, state *State) error {
+	return fmt.Errorf("terminal: DisableEcho not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
+}
+
+func setRawTerminal(fd uintptr) (*State, error) {
+	return fmt.Errorf("terminal: SetRawTerminal not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
+}
+
+func setRawTerminalOutput(uintptr) (*State, error) {
+	return fmt.Errorf("terminal: SetRawTerminalOutput not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
+}
diff --git a/termios_nonbsd.go b/termios_nonbsd.go
index 88b7b21..0a9e922 100644
--- a/termios_nonbsd.go
+++ b/termios_nonbsd.go
@@ -1,5 +1,4 @@
-//go:build !darwin && !freebsd && !netbsd && !openbsd && !windows
-// +build !darwin,!freebsd,!netbsd,!openbsd,!windows
+//go:build !darwin && !freebsd && !js && !netbsd && !openbsd && !wasip1 && !windows
 
 package term
 
diff --git a/termios_unix.go b/termios_unix.go
index a94eebb..c5c7252 100644
--- a/termios_unix.go
+++ b/termios_unix.go
@@ -1,4 +1,4 @@
-//go:build !windows
+//go:build !js && !wasip1 && !windows
 
 package term
 
diff --git a/termios_unsupported.go b/termios_unsupported.go
new file mode 100644
index 0000000..5712224
--- /dev/null
+++ b/termios_unsupported.go
@@ -0,0 +1,12 @@
+//go:build js || wasip1
+
+package term
+
+import (
+	"fmt"
+	"runtime"
+)
+
+func makeRaw(fd uintptr) (*State, error) {
+	return nil, fmt.Errorf("terminal: MakeRaw not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
+}