Add node polyfill files

src/node-polyfill/fs.js

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+// Copyright 2016 wkh237@github. All rights reserved.
+// Use of this source code is governed by a MIT-style license that can be
+// found in the LICENSE file.
+// @flow
+
+import {
+  NativeModules,
+  DeviceEventEmitter,
+  Platform,
+  NativeAppEventEmitter,
+} from 'react-native'
+
+const RNFB = NativeModules.RNFetchBlob
+
+export default class FS {
+
+  static
+
+}

src/node-polyfill/path.js

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+// Copyright 2016 wkh237@github. All rights reserved.
+// Use of this source code is governed by a MIT-style license that can be
+// found in the LICENSE file.
+// @flow
+import Log from '../utils/log'
+import path from 'path-parse'
+const log = new Log('node-path')
+
+log.level(3)
+log.info('node-path polyfill loaded')
+
+const sep = '/'
+
+function basename(str:string):string {
+  return path.parse(str).base
+}
+
+function dirname(str:string):string {
+  return path.parse(str).dir
+}
+
+function extname(str:string):string {
+  return path.parse(str).ext
+}
+
+function format(args:any):string {
+  // TODO :
+}
+
+function isAbsolute(str:string):boolean {
+  // TODO :
+  return true
+}
+
+function join(arr:Array):string {
+  // TODO : error handling and type checking
+  return arr.join('')
+}
+
+function normalize(str:string):string {
+  // TODO
+  return str
+}
+
+// since nodejs modules uses es5 export by default, we should use es5 export here
+export {
+  extname,
+  dirname,
+  basename,
+  // TODOs
+  normalize,
+}

src/node-polyfill/util.js

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+// Copyright 2016 wkh237@github. All rights reserved.
+// Use of this source code is governed by a MIT-style license that can be
+// found in the LICENSE file.
+// @flow
+import Log from '../utils/log'
+const log = new Log('node-util')
+
+log.level(3)
+log.info('node-util polyfill loaded')
+
+function inherits(ctor, superCtor):any {
+  log.verbose('inherits', superCtor, superCtor)
+  if(superCtor) {
+    ctor.prototype = superCtor.prototype
+    ctor.super_ = superCtor
+  }
+  return ctor
+}
+
+// since nodejs modules uses es5 export by default, we should use es5 export here
+export {
+  inherits
+}