diff --git a/termenv_js.go b/termenv_js.go
new file mode 100644
index 0000000..ef7bb5c
--- /dev/null
+++ b/termenv_js.go
@@ -0,0 +1,18 @@
+//go:build js
+// +build js
+
+package termenv
+
+func colorProfile() Profile {
+	return ANSI256
+}
+
+func foregroundColor() Color {
+	// default gray
+	return ANSIColor(7)
+}
+
+func backgroundColor() Color {
+	// default black
+	return ANSIColor(0)
+}