Initialise flipper-ui-browser with socket connection

Summary:
This diff sets up the socket connection between flipper-browser and flipper-server, and verifies that the initial UI initialisation work (e.g. `get-config` command works). The initial RenderHost is initialised as well based on the config and browser APIs.

Note that flipper-ui-core itself isn't started yet, as that has still a plethora of node imports, so Metro will correctly refuse to bundle

Not in this diff
* remove Node usage from flipper-ui-core
* implement all RenderHost APIs

Reviewed By: aigoncharov

Differential Revision: D32644074

fbshipit-source-id: 2c8065caf0191771a3867b69a431ca50eeb7a5a3

desktop/flipper-server/src/startFlipperServer.tsx

@@ -24,7 +24,10 @@ import {
 import path from 'path';
 import fs from 'fs';
 
-export async function startFlipperServer(rootDir: string, staticDir: string) {
+export async function startFlipperServer(
+  rootDir: string,
+  staticDir: string,
+): Promise<FlipperServerImpl> {
   if (os.platform() === 'darwin') {
     // By default Node.JS has its internal certificate storage and doesn't use
     // the system store. Because of this, it's impossible to access ondemand / devserver
@@ -90,6 +93,7 @@ export async function startFlipperServer(rootDir: string, staticDir: string) {
   );
 
   await flipperServer.connect();
+  return flipperServer;
 }
 
 function createLogger(): Logger {
@@ -103,7 +107,7 @@ function createLogger(): Logger {
       // console.warn('(skipped trackTimeSince)', args);
     },
     debug(..._args: any[]) {
-      // TODO: only if verbose console.debug(...args);
+      // TODO: only if double verbose console.debug(...args);
     },
     error(...args: any[]) {
       console.error(...args);
@@ -113,8 +117,9 @@ function createLogger(): Logger {
       console.warn(...args);
       console.warn('(skipped error reporting)');
     },
-    info(...args: any[]) {
-      console.info(...args);
+    info(..._args: any[]) {
+      // TODO: only if  verbose console.debug(...args);
+      // console.info(...args);
     },
   };
 }