Add BundleRegistry docs

docs/bundleregistry.md

@@ -0,0 +1,148 @@
+---
+id: bundleregistry
+title: BundleRegistry
+---
+
+<div class="banner-crna-ejected">
+  <h3>Project with Native Code Required</h3>
+  <p>
+    This API only works in projects made with <code>react-native init</code>
+    or in those made with <code>expo init</code> or Create React Native App which have since ejected. For
+    more information about ejecting, please see
+    the <a href="https://github.com/react-community/create-react-native-app/blob/master/EJECTING.md" target="_blank">guide</a> on
+    the Create React Native App repository.
+  </p>
+</div>
+
+`BundleRegistry` is the JS module which provides an API to load new bundles on-demand and access their exported data. `BundleRegistry` can only be used when running in multi-bundle mode, which means the bundler has to create multiple bundles and store them in the same directory.
+
+To create bundles for multi-bundle mode, you need to use [Haul](https://github.com/callstack/haul/tree/next) and `multi-bundle` command instead of `bundle`. Please refer to [Haul](https://github.com/callstack/haul/tree/next) documentation for a complete guide.
+
+Using `BundleRegistry.loadBundle` you can send request to the native side in React Native to load new bundle either asynchronously (default) or synchronously.
+
+`BundleRegistry` itself is a EventEmitter, so you can use `addListener` to listen for `bundleLoaded` events, emitted when the bundle is loaded and ready to be used.
+
+### Methods
+
+- [`loadBundle`](bundleregistry.md#loadbundle)
+- [`isBundleLoaded`](bundleregistry.md#isbundleloaded)
+- [`getBundleExport`](bundleregistry.md#getbundleexport)
+- [`addListener`](bundleregistry.md#addlistener)
+- [`removeListener`](bundleregistry.md#removelistener)
+- [`enableLogging`](bundleregistry.md#enablelogging)
+- [`disableLogging`](bundleregistry.md#disablelogging)
+
+### Supported events
+
+- [`bundleLoaded`](bundleregistry.md#bundleloaded)
+
+---
+
+# Reference
+
+## Events
+
+### `bundleLoaded`
+
+Emitted when the bundle was loaded, evaluated and it's ready to be used.
+
+Event payload:
+
+| Name               | Type   | Description                                       |
+| ------------------ | ------ | ------------------------------------------------- |
+| bundleName         | string | Name of the loaded bundle                         |
+| loadStartTimestamp | number | Timestamp for when the bundle was started loading |
+
+## Methods
+
+### `loadBundle()`
+
+```javascript
+static loadBundle(bundleName: string, synchronously: boolean = false)
+```
+
+Sends a request to load bundle specified by `bundleName` to the native side. By default th loading is asynchronous and doesn't block the main thread. You can optionally set the 2nd argument to `true` in which case the loading happens synchronously - it's useful when some bundle needs to be loaded before running anything else.
+
+**Example:**
+
+In host/initial bundle:
+
+```javascript
+BundleRegistry.addEventListener(
+  'bundleLoaded',
+  ({bundleName, loadStartTimestamp}) => {
+    console.log(
+      `Bundle ${bundleName} loaded in ${Date.now() - loadStartTimestamp} ms`,
+    );
+  },
+);
+BundleRegistry.loadBundle('app0');
+```
+
+---
+
+### `getBundleExport()`
+
+```javascript
+static getBundleExport(bundleName: string)
+```
+
+Gets bundle default export for specified `bundleName`.
+
+**Example:**
+
+Entry point for `app0` bundle:
+
+```javascript
+export default function App0() {
+  /* ... */
+}
+```
+
+In host/initial bundle:
+
+```javascript
+const App0 = BundleRegistry.getBundleExport('app0');
+```
+
+---
+
+### `addListener()`
+
+```javascript
+static addListener(eventName: string, listener: Function)
+```
+
+Adds event listeners.
+
+---
+
+### `removeListener()`
+
+```javascript
+static removeListener(eventName: string, listener: Function)
+```
+
+Removes event listener.
+
+---
+
+### `enableLogging()`
+
+```javascript
+static enableLogging()
+```
+
+Enables debug logging to `console`.
+
+---
+
+### `disableLogging()`
+
+```javascript
+static disableLogging()
+```
+
+Disables debug logging to `console`.
+
+---

website/i18n/en.json

@@ -53,6 +53,9 @@
       "building-for-apple-tv": {
         "title": "Building For TV Devices"
       },
+      "bundleregistry": {
+        "title": "BundleRegistry"
+      },
       "button": {
         "title": "Button"
       },

website/sidebars.json

@@ -100,6 +100,7 @@
       "alertios",
       "animated",
       "appregistry",
+      "bundleregistry",
       "appstate",
       "asyncstorage",
       "backhandler",