Back out "JS apps support 1/n"

Summary:
Original commit changeset: 56d1ca1a60ed

This broke Android support in some instances. We haven't had a chance to investigate this yet, but this should cleanly reapply, so we can figure out what happened after the release.

Reviewed By: cekkaewnumchai

Differential Revision: D18688590

fbshipit-source-id: ff84080d43fa481cc8c8c669a76aed15d0f8aa56

src/Client.tsx

@@ -13,8 +13,7 @@ import {App} from './App.js';
 import {Logger} from './fb-interfaces/Logger';
 import {Store} from './reducers/index';
 import {setPluginState} from './reducers/pluginStates';
-import {Payload, ConnectionStatus} from 'rsocket-types';
-import {Flowable, Single} from 'rsocket-flowable';
+import {ReactiveSocket} from 'rsocket-types';
 import {performance} from 'perf_hooks';
 import {reportPlatformFailures, reportPluginFailures} from './utils/metrics';
 import {notNull} from './utils/typeUtils';
@@ -98,13 +97,6 @@ const handleError = (
   }
 };
 
-export interface FlipperClientConnection<D, M> {
-  connectionStatus(): Flowable<ConnectionStatus>;
-  close(): void;
-  fireAndForget(payload: Payload<D, M>): void;
-  requestResponse(payload: Payload<D, M>): Single<Payload<D, M>>;
-}
-
 export default class Client extends EventEmitter {
   app: App | undefined;
   connected: boolean;
@@ -113,7 +105,7 @@ export default class Client extends EventEmitter {
   sdkVersion: number;
   messageIdCounter: number;
   plugins: Plugins;
-  connection: FlipperClientConnection<any, any> | null | undefined;
+  connection: ReactiveSocket<any, any> | null | undefined;
   store: Store;
   activePlugins: Set<string>;
   device: Promise<BaseDevice>;
@@ -137,7 +129,7 @@ export default class Client extends EventEmitter {
   constructor(
     id: string,
     query: ClientQuery,
-    conn: FlipperClientConnection<any, any> | null | undefined,
+    conn: ReactiveSocket<any, any> | null | undefined,
     logger: Logger,
     store: Store,
     plugins?: Plugins | null | undefined,