Only create tagged union when class has discriminant property

Author: vojtechhabarta

typescript-generator-core/src/main/java/cz/habarta/typescript/generator/compiler/ModelCompiler.java

@@ -693,7 +693,7 @@ private TsModel createAndUseTaggedUnions(final SymbolTable symbolTable, TsModel
         final List<TsBeanModel> beans = new ArrayList<>();
         final LinkedHashSet<TsAliasModel> typeAliases = new LinkedHashSet<>(tsModel.getTypeAliases());
         for (TsBeanModel bean : tsModel.getBeans()) {
-            if (!bean.getTaggedUnionClasses().isEmpty()) {
+            if (!bean.getTaggedUnionClasses().isEmpty() && bean.getDiscriminantProperty() != null) {
                 final Symbol unionName = symbolTable.getSymbol(bean.getOrigin(), "Union");
                 final List<TsType> unionTypes = new ArrayList<>();
                 for (Class<?> cls : bean.getTaggedUnionClasses()) {

typescript-generator-core/src/main/java/cz/habarta/typescript/generator/ext/JsonDeserializationExtension.java

@@ -98,7 +98,7 @@ private static TsModel createDeserializationMethods(SymbolTable symbolTable, TsM
                     final TsMethodModel genericFunctionConstructor = createDeserializationGenericFunctionConstructor(symbolTable, tsModel, bean);
                     methods.add(0, genericFunctionConstructor);
                 }
-                if (!bean.getTaggedUnionClasses().isEmpty()) {
+                if (bean.getTaggedUnionAlias() != null) {
                     final TsMethodModel unionDeserializationMethod = createDeserializationMethodForTaggedUnion(symbolTable, tsModel, bean);
                     methods.add(1, unionDeserializationMethod);
                 }