Add file watch function to test server

test-server/server.js

 var express = require('express');
 var bodyParser = require('body-parser');
+var chokidar = require('chokidar');
 var multer = require('multer');
 var upload = multer({dest : 'uploads/'});
+var chalk = require('chalk');
+var mkdirp = require('mkdirp');
+var dirname = require('path').dirname;
 var app = express();
 var fs = require('fs');
 
+var JS_SOURCE_PATH = '../test/',
+    APP_SOURCE_PATH = '../RNFetchBlobTest/';
+
+chokidar
+  .watch('../src/index.js')
+  .on('change', function(path) {
+    console.log(chalk.green('js file changed'), path);
+    var targetPath = String(path).replace('../src/', '../RNFetchBlobTest/node_modules/react-native-fetch-blob/')
+    mkdirp(dirname(targetPath), function (err) {
+    if (err) return cb(err);
+      fs.writeFileSync(targetPath, fs.readFileSync(path));
+    });
+  })
+
+chokidar
+  .watch(JS_SOURCE_PATH)
+  .on('add', function(path) {
+    console.log(chalk.magenta('file created'), path);
+    var targetPath = String(path).replace(JS_SOURCE_PATH, APP_SOURCE_PATH)
+    mkdirp(dirname(targetPath), function (err) {
+    if (err) return cb(err);
+      fs.writeFileSync(targetPath, fs.readFileSync(path));
+    });
+  })
+  .on('change', function(path) {
+    console.log(chalk.green('file changed'), path);
+    var targetPath = String(path).replace(JS_SOURCE_PATH, APP_SOURCE_PATH)
+    mkdirp(dirname(targetPath), function (err) {
+    if (err) return cb(err);
+      fs.writeFileSync(targetPath, fs.readFileSync(path));
+    });
+  })
+  .on('unlink', function(path) {
+    console.log(chalk.red('file removed'), path);
+    var targetPath = String(path).replace(JS_SOURCE_PATH, APP_SOURCE_PATH)
+    mkdirp(dirname(targetPath), function (err) {
+    if (err) return cb(err);
+      fs.unlinkSync(targetPath);
+    });
+  })
+  .on('error', function(err){
+    console.log(err);
+  });
+
 app.listen(8123, function(err){
 
   if(!err)
 
 })
 
-// app.use(bodyParser.raw())
 
 app.use(function(req,res,next){