Add Relay Flight Build (#18242)

* Rename to clarify that it's client-only

* Rename FizzStreamer to FizzServer for consistency

* Rename react-flight to react-client/flight

For consistency with react-server. Currently this just includes flight
but it could be expanded to include the whole reconciler.

* Add Relay Flight Build

* Rename ReactServerHostConfig to ReactServerStreamConfig

This will be the config specifically for streaming purposes.
There will be other configs for other purposes.

Author: sebmarkbage

packages/react-flight/README.md renamed to packages/react-client/README.md

@@ -1,4 +1,4 @@
-# react-flight
+# react-client
 
 This is an experimental package for consuming custom React streaming models.
 

packages/react-flight/index.js renamed to packages/react-client/flight.js

@@ -0,0 +1,7 @@
+'use strict';
+
+if (process.env.NODE_ENV === 'production') {
+  module.exports = require('./cjs/react-client-flight.production.min.js');
+} else {
+  module.exports = require('./cjs/react-client-flight.development.js');
+}

packages/react-client/npm/flight.js

@@ -1,5 +1,5 @@
 {
-  "name": "react-flight",
+  "name": "react-client",
   "description": "React package for consuming streaming models.",
   "version": "0.1.0",
   "private": true,
@@ -12,14 +12,13 @@
   "files": [
     "LICENSE",
     "README.md",
-    "index.js",
+    "flight.js",
     "cjs/"
   ],
-  "main": "index.js",
   "repository": {
     "type" : "git",
     "url" : "https://github.com/facebook/react.git",
-    "directory": "packages/react-flight"
+    "directory": "packages/react-client"
   },
   "engines": {
     "node": ">=0.10.0"

packages/react-flight/package.json renamed to packages/react-client/package.json

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+export * from 'react-client/src/ReactFlightClientHostConfigBrowser';