change react native port

change_port.js

'ust strict';
var fs = require('fs');

var replaceOptions = [
  {
    location: './node_modules/react-native/React/React.xcodeproj/project.pbxproj',
    replaceFrom: [
      ' localhost 8081 ;',
      'http://localhost:8081/status',
      'Port 8081 already in use',
    ],
    replaceTo: [
      ' localhost 9000 ;',
      'http://localhost:9000/status',
      'Port 9000 already in use',
    ],
  },
  {
    location: './node_modules/react-native/local-cli/server/server.js',
    replaceFrom: [
      'default: 8081,',
    ],
    replaceTo: [
      'default: 9000,',
    ]
  },
  {
    location: './node_modules/react-native/Libraries/WebSocket/RCTWebSocketExecutor.m',
    replaceFrom: [
      '?: 8081;',
    ],
    replaceTo: [
      '?: 9000;',
    ]
  },
  {
    location: './node_modules/react-native/React/Base/RCTBridgeDelegate.h',
    replaceFrom: [
      'localhost:8081',
    ],
    replaceTo: [
      'localhost:9000',
    ]
  },
  {
    location: './node_modules/react-native/React/Base/RCTBundleURLProvider.m',
    replaceFrom: [
      'DefaultPort = 8081;',
    ],
    replaceTo: [
      'DefaultPort = 9000;',
    ]
  },
  {
    location: './node_modules/react-native/React/DevSupport/RCTInspectorDevServerHelper.mm',
    replaceFrom: [
      'port = @8081;',
    ],
    replaceTo: [
      'port = @9000;',
    ]
  },
  {
    location: './node_modules/react-native/React/DevSupport/RCTPackagerConnectionBridgeConfig.m',
    replaceFrom: [
      'port = @8081;',
    ],
    replaceTo: [
      'port = @9000;',
    ]
  },
];

replaceOptions.forEach( function(replaceOption){

  var filePath = replaceOption.location;
  var fileContent = fs.readFileSync(filePath, 'utf8');
  console.log('read file: ' + filePath );
  var replaceCount = replaceOption.replaceFrom.length;

  for (var i = 0; i < replaceCount; i++){
    var replaceFrom = replaceOption.replaceFrom[i];
    var replaceTo = replaceOption.replaceTo[i];
    fileContent = fileContent.replace(replaceFrom,replaceTo);
    console.log('replaced ' + replaceFrom + ' to ' + replaceTo + '.');
  }

  fs.writeFileSync(filePath, fileContent, 'utf8');
  console.log('write new file: ' + filePath );

});