Fix imports for TS autogenerated imports (#239)

* Update TSD client to only import namespaces that have routes

stone/backends/tsd_client.py

@@ -22,6 +22,7 @@
     fmt_func,
     fmt_tag,
     fmt_type,
+    get_data_types_for_namespace,
 )
 from stone.ir import Void
 
@@ -154,7 +155,11 @@ def generate(self, api):
             self.emit_raw(template[r_end + 1:t_end] + ('\n' if not t_ends_with_newline else ''))
 
     def _generate_import(self, api, type_file):
-        namespaces = ", ".join(map(lambda namespace: namespace.name, api.namespaces.values()))
+        # identify which routes belong to
+        namespaces_with_types = filter(
+            lambda namespace: len(get_data_types_for_namespace(namespace)) != 0,
+            api.namespaces.values())
+        namespaces = ", ".join(map(lambda namespace: namespace.name, namespaces_with_types))
         self.emit("import { %s } from '%s';" % (namespaces, type_file))
 
     def _generate_routes(self, api, spaces_per_indent, indent_level):

stone/backends/tsd_helpers.py

@@ -179,3 +179,6 @@ def generate_imports_for_referenced_namespaces(backend, namespace, module_name_p
             )
         )
     backend.emit()
+
+def get_data_types_for_namespace(namespace):
+    return namespace.data_types + namespace.aliases

stone/backends/tsd_types.py

@@ -38,6 +38,7 @@
     fmt_type_name,
     fmt_union,
     generate_imports_for_referenced_namespaces,
+    get_data_types_for_namespace,
 )
 
 
@@ -186,15 +187,12 @@ def _read_template(self):
         else:
             raise AssertionError('TypeScript template file does not exist.')
 
-    def _get_data_types(self, namespace):
-        return namespace.data_types + namespace.aliases
-
     def _generate_base_namespace_module(self, namespace_list, filename,
                                         template, extra_args,
                                         exclude_error_types=False):
 
         # Skip namespaces that do not contain types.
-        if all([len(self._get_data_types(ns)) == 0 for ns in namespace_list]):
+        if all([len(get_data_types_for_namespace(ns)) == 0 for ns in namespace_list]):
             return
 
         spaces_per_indent = self.args.spaces_per_indent
@@ -238,7 +236,7 @@ def _generate_base_namespace_module(self, namespace_list, filename,
     def _generate_types(self, namespace, spaces_per_indent, extra_args):
         self.cur_namespace = namespace
         # Count aliases as data types too!
-        data_types = self._get_data_types(namespace)
+        data_types = get_data_types_for_namespace(namespace)
         # Skip namespaces that do not contain types.
         if len(data_types) == 0:
             return