diff --git a/angel_serialize_generator/CHANGELOG.md b/angel_serialize_generator/CHANGELOG.md
index 7b086e1f..11a75905 100644
--- a/angel_serialize_generator/CHANGELOG.md
+++ b/angel_serialize_generator/CHANGELOG.md
@@ -1,3 +1,6 @@
+# 2.1.2
+* Add `declare module` to generated TypeScript files.
+
 # 2.1.1
 * Generate `hashCode`.
 
diff --git a/angel_serialize_generator/lib/typescript.dart b/angel_serialize_generator/lib/typescript.dart
index a90bd213..c3890d2e 100644
--- a/angel_serialize_generator/lib/typescript.dart
+++ b/angel_serialize_generator/lib/typescript.dart
@@ -156,9 +156,9 @@ class TypeScriptDefinitionBuilder implements Builder {
     buf.writeln('// GENERATED CODE - DO NOT MODIFY BY HAND');
 
     // declare module `foo` {
-    //buf
-    //  ..writeln("declare module '${buildStep.inputId.package}' {")
-    //  ..indent();
+    buf
+      ..writeln("declare module '${buildStep.inputId.package}' {")
+      ..indent();
 
     for (var ctx in contexts) {
       // interface Bar { ... }
@@ -190,9 +190,9 @@ class TypeScriptDefinitionBuilder implements Builder {
       }
     }
 
-    //buf
-    //  ..outdent()
-    //  ..writeln('}');
+    buf
+      ..outdent()
+      ..writeln('}');
     var finalBuf = new CodeBuffer();
     refs.forEach(finalBuf.writeln);
     buf.copyInto(finalBuf);
diff --git a/angel_serialize_generator/pubspec.yaml b/angel_serialize_generator/pubspec.yaml
index 02332c04..65d0e63b 100644
--- a/angel_serialize_generator/pubspec.yaml
+++ b/angel_serialize_generator/pubspec.yaml
@@ -1,5 +1,5 @@
 name: angel_serialize_generator
-version: 2.1.1
+version: 2.1.2
 description: Model serialization generators, designed for use with Angel. Combine with angel_serialize for flexible modeling.
 author: Tobe O <thosakwe@gmail.com>
 homepage: https://github.com/angel-dart/serialize
diff --git a/angel_serialize_generator/test/models/author.d.ts b/angel_serialize_generator/test/models/author.d.ts
index 25ddec6b..64f0baf1 100644
--- a/angel_serialize_generator/test/models/author.d.ts
+++ b/angel_serialize_generator/test/models/author.d.ts
@@ -1,19 +1,21 @@
 /// <reference path="./book.d.ts" />
 // GENERATED CODE - DO NOT MODIFY BY HAND
-interface Library {
-  id?: string;
-  collection?: LibraryCollection;
-  created_at?: any;
-  updated_at?: any;
-}
-interface LibraryCollection {
-  [key: string]: Book;
-}
-interface Bookmark {
-  id?: string;
-  history?: number[];
-  page: number;
-  comment?: string;
-  created_at?: any;
-  updated_at?: any;
+declare module 'angel_serialize_generator' {
+  interface Library {
+    id?: string;
+    collection?: LibraryCollection;
+    created_at?: any;
+    updated_at?: any;
+  }
+  interface LibraryCollection {
+    [key: string]: Book;
+  }
+  interface Bookmark {
+    id?: string;
+    history?: number[];
+    page: number;
+    comment?: string;
+    created_at?: any;
+    updated_at?: any;
+  }
 }
\ No newline at end of file
diff --git a/angel_serialize_generator/test/models/book.d.ts b/angel_serialize_generator/test/models/book.d.ts
index 676749be..e67cc967 100644
--- a/angel_serialize_generator/test/models/book.d.ts
+++ b/angel_serialize_generator/test/models/book.d.ts
@@ -1,12 +1,14 @@
 // GENERATED CODE - DO NOT MODIFY BY HAND
-interface Book {
-  id?: string;
-  author?: string;
-  title?: string;
-  description?: string;
-  page_count?: number;
-  not_models?: number[];
-  camelCase?: string;
-  created_at?: any;
-  updated_at?: any;
+declare module 'angel_serialize_generator' {
+  interface Book {
+    id?: string;
+    author?: string;
+    title?: string;
+    description?: string;
+    page_count?: number;
+    not_models?: number[];
+    camelCase?: string;
+    created_at?: any;
+    updated_at?: any;
+  }
 }
\ No newline at end of file