keep old docs around

Author: SimenB

website/versioned_docs/version-22.x/TutorialReactNative.md

@@ -201,3 +201,22 @@ jest.mock('Text', () => {
 In other cases you may want to mock a native module that isn't a React component. The same technique can be applied. We recommend inspecting the native module's source code and logging the module when running a react native app on a real device and then modeling a manual mock after the real module.
 
 If you end up mocking the same modules over and over it is recommended to define these mocks in a separate file and add it to the list of `setupFiles`.
+
+### `@providesModule`
+
+If you'd like to use Facebook's `@providesModule` module system through an npm package, the default haste config option must be overwritten and npm modules must be added to `providesModuleNodeModules`:
+
+```json
+"haste": {
+  "defaultPlatform": "ios",
+  "platforms": ["android", "ios"],
+  "providesModuleNodeModules": [
+    "react",
+    "react-native",
+    "my-awesome-module",
+    "my-text-component"
+  ]
+},
+```
+
+If you'd like to test a different default platform or if you are building for other platforms, the `defaultPlatform` and `platforms` configuration option can be updated.