Introduce showNotification API

Summary: Introduced `showNotifcation` to the Sandy API.

Reviewed By: jknoxville

Differential Revision: D27012001

fbshipit-source-id: d3f237910a478400b0f925f0362af485c96072bb

desktop/app/src/plugin.tsx

@@ -11,7 +11,7 @@ import {KeyboardActions} from './MenuBar';
 import {Logger} from './fb-interfaces/Logger';
 import Client from './Client';
 import {Store} from './reducers/index';
-import {ReactNode, Component} from 'react';
+import {Component} from 'react';
 import BaseDevice from './devices/BaseDevice';
 import {serialize, deserialize} from './utils/serialization';
 import {StaticView} from './reducers/connections';
@@ -19,7 +19,7 @@ import {State as ReduxState} from './reducers';
 import {DEFAULT_MAX_QUEUE_SIZE} from './reducers/pluginMessageQueue';
 import {ActivatablePluginDetails} from 'flipper-plugin-lib';
 import {Settings} from './reducers/settings';
-import {Idler, _SandyPluginDefinition} from 'flipper-plugin';
+import {Notification, Idler, _SandyPluginDefinition} from 'flipper-plugin';
 
 type Parameters = {[key: string]: any};
 
@@ -68,16 +68,6 @@ export interface PluginClient {
 
 type PluginTarget = BaseDevice | Client;
 
-export type Notification = {
-  id: string;
-  title: string;
-  message: string | ReactNode;
-  severity: 'warning' | 'error';
-  timestamp?: number;
-  category?: string;
-  action?: string;
-};
-
 export type Props<T> = {
   logger: Logger;
   persistedState: T;