update to be more like creat-react-app@2.3

Author: smmoosavi

bin/monkey-react-scripts.js

@@ -1,11 +1,18 @@
 #!/usr/bin/env node
 'use strict';
 
+// Makes the script crash on unhandled rejections instead of silently
+// ignoring them. In the future, promise rejections that are not handled will
+// terminate the Node.js process with a non-zero exit code.
+process.on('unhandledRejection', err => {
+    throw err;
+});
+
 const spawn = require('react-dev-utils/crossSpawn');
 const args = process.argv.slice(2);
 
 const scriptIndex = args.findIndex(
-    x => x === 'build' || x === 'eject' || x === 'start' || x === 'test'
+  x => x === 'build' || x === 'eject' || x === 'start' || x === 'test'
 );
 const script = scriptIndex === -1 ? args[0] : args[scriptIndex];
 const nodeArgs = scriptIndex > 0 ? args.slice(0, scriptIndex) : [];
@@ -15,24 +22,24 @@ switch (script) {
     case 'start':
     case 'test': {
         const result = spawn.sync(
-            'node',
-            nodeArgs
-                .concat(require.resolve('../scripts/' + script))
-                .concat(args.slice(scriptIndex + 1)),
-            {stdio: 'inherit'}
+          'node',
+          nodeArgs
+            .concat(require.resolve('../scripts/' + script))
+            .concat(args.slice(scriptIndex + 1)),
+          { stdio: 'inherit' }
         );
         if (result.signal) {
             if (result.signal === 'SIGKILL') {
                 console.log(
-                    'The build failed because the process exited too early. ' +
-                    'This probably means the system ran out of memory or someone called ' +
-                    '`kill -9` on the process.'
+                  'The build failed because the process exited too early. ' +
+                  'This probably means the system ran out of memory or someone called ' +
+                  '`kill -9` on the process.'
                 );
             } else if (result.signal === 'SIGTERM') {
                 console.log(
-                    'The build failed because the process exited too early. ' +
-                    'Someone might have called `kill` or `killall`, or the system could ' +
-                    'be shutting down.'
+                  'The build failed because the process exited too early. ' +
+                  'Someone might have called `kill` or `killall`, or the system could ' +
+                  'be shutting down.'
                 );
             }
             process.exit(1);