Show network address on start (facebook#2155)

* Show network address on start

* Tweak visual representation

config/webpackDevServer.config.js

@@ -17,7 +17,7 @@ const paths = require('./paths');
 const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
 const host = process.env.HOST || '0.0.0.0';
 
-module.exports = function(proxy) {
+module.exports = function(proxy, allowedHost) {
   return {
     // Enable gzip compression of generated files.
     compress: true,
@@ -67,6 +67,7 @@ module.exports = function(proxy) {
       // See https://github.com/facebookincubator/create-react-app/issues/387.
       disableDotRule: true,
     },
+    public: allowedHost,
     proxy,
     setup(app) {
       // This lets us open files from the crash overlay.

package.json

@@ -21,6 +21,8 @@
     "react-scripts": "./bin/react-scripts.js"
   },
   "dependencies": {
+    "@timer/detect-port": "1.1.2",
+    "address": "1.0.1",
     "autoprefixer": "6.7.7",
     "babel-core": "6.23.1",
     "babel-eslint": "7.1.1",
@@ -33,7 +35,6 @@
     "connect-history-api-fallback": "1.3.0",
     "cross-spawn": "4.0.2",
     "css-loader": "0.28.0",
-    "@timer/detect-port": "1.1.2",
     "dotenv": "2.0.0",
     "eslint": "3.16.1",
     "eslint-config-react-app": "^0.6.1",

scripts/start.js

@@ -22,6 +22,7 @@ process.env.NODE_ENV = 'development';
 // Ensure environment variables are read.
 require('../config/env');
 
+const address = require('address');
 const fs = require('fs');
 const chalk = require('chalk');
 const detect = require('@timer/detect-port');
@@ -53,25 +54,23 @@ const HOST = process.env.HOST || '0.0.0.0';
 
 function run(port) {
   const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
-  const formattedUrl = url.format({
-    protocol,
-    hostname: HOST,
-    port,
-    pathname: '/',
-  });
 
-  let prettyHost;
-  if (HOST === '0.0.0.0' || HOST === '::') {
+  const formatUrl = hostname =>
+    url.format({ protocol, hostname, port, pathname: '/' });
+
+  const isUnspecifiedAddress = HOST === '0.0.0.0' || HOST === '::';
+  let prettyHost, lanAddress;
+  if (isUnspecifiedAddress) {
     prettyHost = 'localhost';
+    try {
+      lanAddress = address.ip();
+    } catch (_e) {
+      // ignored
+    }
   } else {
     prettyHost = HOST;
   }
-  const prettyUrl = url.format({
-    protocol,
-    hostname: prettyHost,
-    port,
-    pathname: '/',
-  });
+  const prettyUrl = formatUrl(prettyHost);
 
   // Create a webpack compiler that is configured with custom messages.
   const compiler = createWebpackCompiler(
@@ -81,9 +80,22 @@ function run(port) {
         return;
       }
       console.log();
-      console.log('The app is running at:');
+      console.log(
+        `You can now view ${chalk.bold(require(paths.appPackageJson).name)} in the browser.`
+      );
       console.log();
-      console.log(`  ${chalk.cyan(formattedUrl)}`);
+
+      if (isUnspecifiedAddress && lanAddress) {
+        console.log(
+          `  ${chalk.bold('Local:')}            ${chalk.cyan(prettyUrl)}`
+        );
+        console.log(
+          `  ${chalk.bold('On Your Network:')}  ${chalk.cyan(formatUrl(lanAddress))}`
+        );
+      } else {
+        console.log(`  ${chalk.cyan(prettyUrl)}`);
+      }
+
       console.log();
       console.log('Note that the development build is not optimized.');
       console.log(
@@ -98,7 +110,7 @@ function run(port) {
   // Serve webpack assets generated by the compiler over a web sever.
   const devServer = new WebpackDevServer(
     compiler,
-    devServerConfig(prepareProxy(proxy))
+    devServerConfig(prepareProxy(proxy), lanAddress)
   );
 
   // Launch WebpackDevServer.
@@ -113,7 +125,7 @@ function run(port) {
     console.log(chalk.cyan('Starting the development server...'));
     console.log();
 
-    openBrowser(prettyUrl);
+    openBrowser(formatUrl(prettyHost));
   });
 }