diff --git a/docs/typescript-definition-package/processors/createTypeDefinitionFile.js b/docs/typescript-definition-package/processors/createTypeDefinitionFile.js
index 58b6520ee6..af3f56b121 100644
--- a/docs/typescript-definition-package/processors/createTypeDefinitionFile.js
+++ b/docs/typescript-definition-package/processors/createTypeDefinitionFile.js
@@ -2,7 +2,7 @@ var _ = require('lodash');
 var path = require('canonical-path');
 var codeGen = require('./code_gen.js');
 
-module.exports = function createTypeDefinitionFile(log) {
+module.exports = function createTypeDefinitionFile(log, convertPrivateClassesToInterfaces) {
 
   return {
     $runAfter: ['processing-docs'],
@@ -63,29 +63,7 @@ module.exports = function createTypeDefinitionFile(log) {
             doc = null;
             return;
           }
-          _.forEach(modDoc.doc.exports, function(exportDoc) {
-
-            // Search for classes with a constructor marked as `@private`
-            if (exportDoc.docType === 'class' && exportDoc.constructorDoc && exportDoc.constructorDoc.private) {
-
-              // Convert this class to an interface with no constructor
-              exportDoc.docType = 'interface';
-              exportDoc.constructorDoc = null;
-
-              if (exportDoc.heritage) {
-                // convert the heritage since interfaces use `extends` not `implements`
-                exportDoc.heritage = exportDoc.heritage.replace('implements', 'extends');
-              }
-
-              // Add the `declare var SomeClass extends InjectableReference` construct
-              modDoc.doc.exports.push({
-                docType: 'var',
-                name: exportDoc.name,
-                id: exportDoc.id,
-                returnType: 'InjectableReference'
-              });
-            }
-          });
+          convertPrivateClassesToInterfaces(modDoc.doc.exports, true);
         });
         return !!doc;
       });
diff --git a/docs/typescript-package/index.js b/docs/typescript-package/index.js
index 165c654640..1e35385349 100644
--- a/docs/typescript-package/index.js
+++ b/docs/typescript-package/index.js
@@ -15,6 +15,8 @@ module.exports = new Package('typescript-parsing', [basePackage])
 .factory(require('./services/tsParser/getExportDocType'))
 .factory(require('./services/tsParser/getContent'))
 
+.factory(require('./services/convertPrivateClassesToInterfaces'))
+
 .factory('EXPORT_DOC_TYPES', function() {
   return [
     'class',
diff --git a/docs/typescript-package/services/convertPrivateClassesToInterfaces.js b/docs/typescript-package/services/convertPrivateClassesToInterfaces.js
new file mode 100644
index 0000000000..9dbe32a544
--- /dev/null
+++ b/docs/typescript-package/services/convertPrivateClassesToInterfaces.js
@@ -0,0 +1,31 @@
+var _ = require('lodash');
+
+module.exports = function convertPrivateClassesToInterfaces() {
+  return function(exportDocs, addInjectableReference) {
+    _.forEach(exportDocs, function(exportDoc) {
+
+      // Search for classes with a constructor marked as `@private`
+      if (exportDoc.docType === 'class' && exportDoc.constructorDoc && exportDoc.constructorDoc.private) {
+
+        // Convert this class to an interface with no constructor
+        exportDoc.docType = 'interface';
+        exportDoc.constructorDoc = null;
+
+        if (exportDoc.heritage) {
+          // convert the heritage since interfaces use `extends` not `implements`
+          exportDoc.heritage = exportDoc.heritage.replace('implements', 'extends');
+        }
+
+        if (addInjectableReference) {
+          // Add the `declare var SomeClass extends InjectableReference` construct
+          exportDocs.push({
+            docType: 'var',
+            name: exportDoc.name,
+            id: exportDoc.id,
+            returnType: 'InjectableReference'
+          });
+        }
+      }
+    });
+  };
+};
diff --git a/docs/typescript-package/services/convertPrivateClassesToInterfaces.spec.js b/docs/typescript-package/services/convertPrivateClassesToInterfaces.spec.js
new file mode 100644
index 0000000000..1292f30cc6
--- /dev/null
+++ b/docs/typescript-package/services/convertPrivateClassesToInterfaces.spec.js
@@ -0,0 +1,76 @@
+var mockPackage = require('../mocks/mockPackage');
+var Dgeni = require('dgeni');
+var _ = require('lodash');
+
+describe('readTypeScriptModules', function() {
+  var dgeni, injector, convertPrivateClassesToInterfaces;
+
+  beforeEach(function() {
+    dgeni = new Dgeni([mockPackage()]);
+    injector = dgeni.configureInjector();
+    convertPrivateClassesToInterfaces = injector.get('convertPrivateClassesToInterfaces');
+  });
+
+  it('should convert private class docs to interface docs', function() {
+    var docs = [
+      {
+        docType: 'class',
+        name: 'privateClass',
+        id: 'privateClass',
+        constructorDoc: { private: true }
+      }
+    ];
+    convertPrivateClassesToInterfaces(docs, false);
+    expect(docs[0].docType).toEqual('interface');
+  });
+
+
+  it('should not touch non-private class docs', function() {
+    var docs = [
+      {
+        docType: 'class',
+        name: 'privateClass',
+        id: 'privateClass',
+        constructorDoc: { }
+      }
+    ];
+    convertPrivateClassesToInterfaces(docs, false);
+    expect(docs[0].docType).toEqual('class');
+  });
+
+
+  it('should convert the heritage since interfaces use `extends` not `implements`', function() {
+    var docs = [
+      {
+        docType: 'class',
+        name: 'privateClass',
+        id: 'privateClass',
+        constructorDoc: { private: true },
+        heritage: 'implements parentInterface'
+      }
+    ];
+    convertPrivateClassesToInterfaces(docs, false);
+    expect(docs[0].heritage).toEqual('extends parentInterface');
+  });
+
+
+  it('should add new injectable reference types, if specified, to the passed in collection', function() {
+    var docs = [
+      {
+        docType: 'class',
+        name: 'privateClass',
+        id: 'privateClass',
+        constructorDoc: { private: true },
+        heritage: 'implements parentInterface'
+      }
+    ];
+    convertPrivateClassesToInterfaces(docs, true);
+    expect(docs[1]).toEqual({
+      docType : 'var',
+      name : 'privateClass',
+      id : 'privateClass',
+      returnType : 'InjectableReference'
+    });
+  });
+
+});