defaultPersistedState

Summary: adding a `static defaultPersistedState` which plugins can use to populate their persistedState for the first render.

Reviewed By: passy

Differential Revision: D10446987

fbshipit-source-id: eb37553db7bbec31edf5b4972176e71f303639fe

src/Client.js

@@ -169,7 +169,10 @@ export default class Client extends EventEmitter {
 
         if (persistingPlugin) {
           const pluginKey = `${this.id}#${params.api}`;
-          const persistedState = this.store.getState().pluginStates[pluginKey];
+          const persistedState = {
+            ...persistingPlugin.defaultPersistedState,
+            ...this.store.getState().pluginStates[pluginKey],
+          };
           // $FlowFixMe: We checked persistedStateReducer exists
           const newPluginState = persistingPlugin.persistedStateReducer(
             persistedState,

src/PluginContainer.js

@@ -135,7 +135,12 @@ class PluginContainer extends Component<Props, State> {
     const props: PluginProps<Object> = {
       key: pluginKey,
       logger: this.props.logger,
-      persistedState: pluginStates[pluginKey] || {},
+      persistedState: activePlugin.defaultPersistedState
+        ? {
+            ...activePlugin.defaultPersistedState,
+            ...pluginStates[pluginKey],
+          }
+        : pluginStates[pluginKey],
       setPersistedState: state => setPluginState({pluginKey, state}),
       target,
       deepLinkPayload: this.props.deepLinkPayload,

src/plugin.js

@@ -52,6 +52,7 @@ export class FlipperBasePlugin<
   static icon: string = 'apps';
   static keyboardActions: ?KeyboardActions;
   static screenshot: ?string;
+  static defaultPersistedState: PersistedState;
 
   // forbid instance properties that should be static
   title: empty;