fix: treat type aliased subpackage types as underlying types

go-runtime/compile/schema.go

@@ -1267,7 +1267,11 @@ func visitType(pctx *parseContext, pos token.Pos, tnode types.Type, isExported b
 	switch underlying := tnode.Underlying().(type) {
 	case *types.Basic:
 		if named, ok := tnode.(*types.Named); ok {
-			return visitNamedRef(pctx, pos, named, isExported)
+			if !pctx.isPathInPkg(named.Obj().Pkg().Path()) {
+				// external named types get treated as refs
+				return visitNamedRef(pctx, pos, named, isExported)
+			}
+			// internal named types without decls are treated as basic types
 		}
 		switch underlying.Kind() {
 		case types.String:

go-runtime/compile/schema_test.go

@@ -323,6 +323,26 @@ func TestExtractModuleSchemaNamedTypes(t *testing.T) {
 	assert.Equal(t, normaliseString(expected), normaliseString(actual.String()))
 }
 
+func TestExtractModuleSchemaParent(t *testing.T) {
+	prebuildTestModule(t, "testdata/parent")
+	if testing.Short() {
+		t.SkipNow()
+	}
+	r, err := ExtractModuleSchema("testdata/parent", &schema.Schema{})
+	assert.NoError(t, err)
+	assert.Equal(t, r.MustGet().Errors, nil, "expected no schema errors")
+	actual := schema.Normalise(r.MustGet().Module)
+	expected := `module parent {
+			export data ChildStruct {
+			name String?
+		}
+
+		export verb verb(Unit) parent.ChildStruct
+	}
+	`
+	assert.Equal(t, normaliseString(expected), normaliseString(actual.String()))
+}
+
 func TestParsedirectives(t *testing.T) {
 	tests := []struct {
 		name     string

go-runtime/compile/testdata/parent/child/child.go

@@ -0,0 +1,11 @@
+package child
+
+import (
+	"github.com/TBD54566975/ftl/go-runtime/ftl" // Import the FTL SDK.
+)
+
+type ChildStruct struct {
+	Name ftl.Option[ChildAlias]
+}
+
+type ChildAlias string

go-runtime/compile/testdata/parent/ftl.toml

@@ -0,0 +1,2 @@
+module = "parent"
+language = "go"

go-runtime/compile/testdata/parent/go.mod

@@ -0,0 +1,45 @@
+module ftl/parent
+
+go 1.22.2
+
+toolchain go1.22.3
+
+require github.com/TBD54566975/ftl v0.222.1
+
+require (
+	connectrpc.com/connect v1.16.1 // indirect
+	connectrpc.com/grpcreflect v1.2.0 // indirect
+	connectrpc.com/otelconnect v0.7.0 // indirect
+	github.com/alecthomas/concurrency v0.0.2 // indirect
+	github.com/alecthomas/participle/v2 v2.1.1 // indirect
+	github.com/alecthomas/types v0.15.0 // indirect
+	github.com/alessio/shellescape v1.4.2 // indirect
+	github.com/danieljoos/wincred v1.2.0 // indirect
+	github.com/go-logr/logr v1.4.1 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/godbus/dbus/v5 v5.1.0 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
+	github.com/jackc/pgx/v5 v5.5.5 // indirect
+	github.com/jackc/puddle/v2 v2.2.1 // indirect
+	github.com/jpillora/backoff v1.0.0 // indirect
+	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/multiformats/go-base36 v0.2.0 // indirect
+	github.com/swaggest/jsonschema-go v0.3.70 // indirect
+	github.com/swaggest/refl v1.3.0 // indirect
+	github.com/zalando/go-keyring v0.2.4 // indirect
+	go.opentelemetry.io/otel v1.26.0 // indirect
+	go.opentelemetry.io/otel/metric v1.26.0 // indirect
+	go.opentelemetry.io/otel/trace v1.26.0 // indirect
+	golang.org/x/crypto v0.23.0 // indirect
+	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect
+	golang.org/x/mod v0.17.0 // indirect
+	golang.org/x/net v0.25.0 // indirect
+	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/text v0.15.0 // indirect
+	google.golang.org/protobuf v1.34.1 // indirect
+)
+
+replace github.com/TBD54566975/ftl => ../../../..

go-runtime/compile/testdata/parent/parent.go

@@ -0,0 +1,12 @@
+package parent
+
+import (
+	"context"
+	// Import the FTL SDK.
+	"ftl/parent/child"
+)
+
+//ftl:verb export
+func Verb(ctx context.Context) (child.ChildStruct, error) {
+	return child.ChildStruct{}, nil
+}