feat: support JS and Go source files in fission package loader

terraform/provider/internal/resources/package_resource_test.go

@@ -49,6 +49,40 @@ func TestLoadPackageLiteralFromSourceDir(t *testing.T) {
 	}
 }
 
+func TestLoadPackageLiteralFromSourceDirJS(t *testing.T) {
+	tempDir := t.TempDir()
+	mainPath := filepath.Join(tempDir, "main.js")
+	content := []byte("module.exports = async function() { return 'ok'; }\n")
+	if err := os.WriteFile(mainPath, content, 0o600); err != nil {
+		t.Fatalf("write temp main.js: %v", err)
+	}
+
+	loaded, err := loadPackageLiteral(tempDir, "")
+	if err != nil {
+		t.Fatalf("loadPackageLiteral returned error: %v", err)
+	}
+	if string(loaded) != string(content) {
+		t.Fatalf("unexpected loaded content")
+	}
+}
+
+func TestLoadPackageLiteralFromSourceDirGo(t *testing.T) {
+	tempDir := t.TempDir()
+	mainPath := filepath.Join(tempDir, "main.go")
+	content := []byte("package main\nfunc main() {}\n")
+	if err := os.WriteFile(mainPath, content, 0o600); err != nil {
+		t.Fatalf("write temp main.go: %v", err)
+	}
+
+	loaded, err := loadPackageLiteral(tempDir, "")
+	if err != nil {
+		t.Fatalf("loadPackageLiteral returned error: %v", err)
+	}
+	if string(loaded) != string(content) {
+		t.Fatalf("unexpected loaded content")
+	}
+}
+
 func TestPackageToUnstructured(t *testing.T) {
 	input := packageResourceModel{
 		Name:        types.StringValue("pkg-a"),