diff --git a/.babelrc b/.babelrc
index fe16857..6d0a1fb 100644
--- a/.babelrc
+++ b/.babelrc
@@ -1,5 +1,5 @@
 {
-  "presets": ["es2015-node6", "stage-1", "react"],
+  "presets": ["es2015-node6", "stage-1", "react", "flow"],
   "plugins": [
     "transform-decorators-legacy",
     "add-module-exports",
diff --git a/.flowconfig b/.flowconfig
new file mode 100644
index 0000000..547bb83
--- /dev/null
+++ b/.flowconfig
@@ -0,0 +1,16 @@
+[ignore]
+.*/node_modules/fbjs/*
+
+
+[include]
+./src/browser/App.react.js
+
+[libs]
+
+[options]
+module.ignore_non_literal_requires=true
+esproposal.class_instance_fields=enable
+esproposal.class_static_fields=enable
+esproposal.decorators=ignore
+esproposal.export_star_as=enable
+strip_root=true
diff --git a/flow-typed/declarations.js b/flow-typed/declarations.js
new file mode 100644
index 0000000..ec5af30
--- /dev/null
+++ b/flow-typed/declarations.js
@@ -0,0 +1,10 @@
+/*
+  If Flow throws "Required module not found", altough module is not missing,
+  add new "declare module" statement here for that library.
+*/
+
+declare module 'react-helmet' {
+  declare module.exports: any;
+}
+
+declare var webpackIsomorphicTools: Object;
diff --git a/package.json b/package.json
index 04afff5..8c5424b 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "Haystack",
   "description": "Blueberry JS stack",
-  "version": "0.0.1",
+  "version": "0.0.2",
   "private": true,
   "engines": {
     "node": ">=6.9",
@@ -16,7 +16,7 @@
     "production": "yarn run production:build && yarn rollbar:sourcemaps:upload && yarn run production:server",
     "eslint": "eslint ./src",
     "jest": " jest",
-    "test": "jest",
+    "test": "flow && jest",
     "test:watch": "jest --watch",
     "webpack": "rimraf ./dist && webpack --config ./webpack/webpack.config.js",
     "rollbar:sourcemaps:upload": "node scripts/rollbarSourceMaps.js"
@@ -29,7 +29,9 @@
     "TondaHack"
   ],
   "devDependencies": {
+    "babel-cli": "^6.24.0",
     "babel-eslint": "^7.1.1",
+    "babel-preset-flow": "^6.23.0",
     "chokidar": "^1.6.1",
     "enzyme": "^2.7.0",
     "enzyme-to-json": "^1.4.5",
@@ -38,6 +40,7 @@
     "eslint-plugin-import": "^2.2.0",
     "eslint-plugin-jsx-a11y": "^3.0.2",
     "eslint-plugin-react": "^6.9.0",
+    "flow-bin": "^0.42.0",
     "jest": "^18.1.0",
     "react-addons-test-utils": "^15.4.2"
   },
diff --git a/src/browser/App.react.js b/src/browser/App.react.js
index 04b1924..057685a 100644
--- a/src/browser/App.react.js
+++ b/src/browser/App.react.js
@@ -1,3 +1,4 @@
+// @flow
 import Helmet from 'react-helmet';
 import React from 'react';
 import logo from '../../assets/images/haystack_logo.png';
@@ -5,7 +6,7 @@ import logo from '../../assets/images/haystack_logo.png';
 const App = () => (
   <div>
     <Helmet title="Haystack" />
-    <button onClick={e => window.console.log(e)}>
+    <button onClick={(e: Event) => window.console.log(e)}>
       Haystack
       <img alt="logo" src={logo} />
     </button>
diff --git a/src/browser/BrowserProvider.react.js b/src/browser/BrowserProvider.react.js
index 1e02ada..e0f0f09 100644
--- a/src/browser/BrowserProvider.react.js
+++ b/src/browser/BrowserProvider.react.js
@@ -1,3 +1,4 @@
-const BrowserProvider = ({ children }) => children;
+// @flow
 
+const BrowserProvider = ({ children } : Object) : Object => children;
 export default BrowserProvider;
diff --git a/src/browser/main.js b/src/browser/main.js
index 4f36738..024ad35 100644
--- a/src/browser/main.js
+++ b/src/browser/main.js
@@ -1,19 +1,24 @@
+// @flow
 import React from 'react';
 import ReactDOM from 'react-dom';
 import App from './App.react';
 import BrowserProvider from './BrowserProvider.react';
 
+type Module = {
+      hot: { accept: (Component: Function, callback: (updatedComponent: Function) => void) => void }
+  } | Object;
+
 const renderApp = () => {
   ReactDOM.render(
     <BrowserProvider>
       <App />
     </BrowserProvider>,
-    window.document.getElementById('app')
+    window.document.getElementById('app'),
   );
 };
 
 if (module && module.hot && module.hot.accept) {
-  module.hot.accept(App, renderApp);
+  (module: Module).hot.accept(App, renderApp);
 }
 
 renderApp();
diff --git a/src/server/frontend/Html.react.js b/src/server/frontend/Html.react.js
index 5b762d2..b3de14f 100644
--- a/src/server/frontend/Html.react.js
+++ b/src/server/frontend/Html.react.js
@@ -1,9 +1,28 @@
-/* eslint-disable react/no-danger */
+// @flow
+/* eslint-disable react/no-danger  */
+/* eslint-disable react/no-unused-prop-types */
 import React, { PropTypes as RPT } from 'react';
+import type { Helmet } from 'react-helmet';
 import Rollbar from './scripts/Rollbar';
 import Script from './Script.react';
 
-const Html = ({ bodyHtml, javascripts = {}, helmet, options }) => (
+export type Options = {
+  disableJS?: boolean
+}
+
+type Javascripts = {
+  vendor?: string,
+  app?: string
+}
+
+type HtmlProps = {
+  bodyHtml: string,
+  javascripts: Javascripts,
+  helmet: Helmet,
+  options: Options
+}
+
+const Html = ({ bodyHtml, javascripts = {}, helmet, options }: HtmlProps) => (
   <html lang="en">
     <head>
       <meta charSet="utf-8" />
diff --git a/src/server/frontend/Script.react.js b/src/server/frontend/Script.react.js
index fe33190..df6ac28 100644
--- a/src/server/frontend/Script.react.js
+++ b/src/server/frontend/Script.react.js
@@ -1,9 +1,12 @@
+// @flow
 import React, { PropTypes as RPT } from 'react';
 
-const Script = ({ src }) => (<script src={src} type="text/javascript" />);
+const Script = (props: { src: string }) => (
+  <script src={props.src} type="text/javascript" />
+);
 
 Script.propTypes = {
-  src: RPT.string.isRequired
+  src: RPT.string.isRequired,
 };
 
 export default Script;
diff --git a/src/server/frontend/errors/NotFound.react.js b/src/server/frontend/errors/NotFound.react.js
index 92b322d..d5d8036 100644
--- a/src/server/frontend/errors/NotFound.react.js
+++ b/src/server/frontend/errors/NotFound.react.js
@@ -1,6 +1,7 @@
+// @flow
 import React, { PropTypes as RPT } from 'react';
 
-const NotFound = ({ path }) => (
+const NotFound = ({ path }: { path: string }) => (
   <div>
     <h1>404: Needle ({path}) not found in Haystack :(</h1>
     You can redirect to <a href="/">home</a>.
@@ -8,7 +9,7 @@ const NotFound = ({ path }) => (
 );
 
 NotFound.propTypes = {
-  path: RPT.string.isRequired
+  path: RPT.string.isRequired,
 };
 
 export default NotFound;
diff --git a/src/server/frontend/index.js b/src/server/frontend/index.js
index 55afa6f..31dac6b 100644
--- a/src/server/frontend/index.js
+++ b/src/server/frontend/index.js
@@ -1,4 +1,6 @@
+// @flow
 import express from 'express';
+import type { Express, $Request, $Response } from 'express';
 import path from 'path';
 import PrettyError from 'pretty-error';
 import React from 'react';
@@ -7,12 +9,12 @@ import NotFound from './errors/NotFound.react';
 import App from '../../browser/App.react';
 import render from './render';
 
-const app = express();
+const app: Express = express();
 const prettyError = new PrettyError();
 
 app.use('/assets', express.static(path.join(__dirname, '..', '..', '..', 'dist', 'public', 'assets')));
 
-app.get('*', (req, res, next) => {
+app.get('*', (req: $Request, res: $Response, next: Function) => {
   try {
     if (req.path === '/unknown') {
       return res.status(404).send(render(<NotFound path={req.path} />));
@@ -24,7 +26,7 @@ app.get('*', (req, res, next) => {
 });
 
 // Internal server error handled by nice formatted HTML
-app.use((err, req, res, next) => {
+app.use((err: Error, req: $Request, res: $Response, next: Function) => {
   console.error('Internal server error at %s', req.path);
   console.error(prettyError.render(err));
 
diff --git a/src/server/frontend/render.js b/src/server/frontend/render.js
index 95231d0..56d362c 100644
--- a/src/server/frontend/render.js
+++ b/src/server/frontend/render.js
@@ -1,10 +1,12 @@
+// @flow
 import Helmet from 'react-helmet';
 import React from 'react';
 import ReactDOMServer from 'react-dom/server';
 import Html from './Html.react';
 import ServerProvider from './ServerProvider.react';
+import type { Options } from './Html.react';
 
-export default function render(app, options = {}) {
+export default function render(app : Object, options : Options = {}) {
   const appHtml = ReactDOMServer.renderToString(<ServerProvider>{app}</ServerProvider>);
 
   const { javascript: javascripts } = webpackIsomorphicTools.assets();
diff --git a/src/server/index.js b/src/server/index.js
index e11ed30..5f30d60 100644
--- a/src/server/index.js
+++ b/src/server/index.js
@@ -1,12 +1,35 @@
+// @flow
+import type { $Request, $Response } from 'express';
+
 // Bootstrap environment
 require('../../env');
 
 // Enabling Source maps for node
 require('source-map-support/register');
-require('babel-register');// eslint-disable-line import/no-extraneous-dependencies
+require('babel-register'); // eslint-disable-line import/no-extraneous-dependencies
+
+type Watcher = {
+  watch: Function,
+};
+
+type IsomorphicTools = {
+  refresh: Function,
+  assets: Function,
+};
+
+type Config = {
+  output: {
+    publicPath: string,
+  },
+};
+
+type Timer = {
+  start: () => void,
+  get: () => number
+}
 
 // Start timer
-const timer = require('../utils/timer');
+const timer : Timer = require('../utils/timer');
 
 timer.start();
 
@@ -14,13 +37,12 @@ timer.start();
 const chalk = require('chalk');
 const clearConsole = require('react-dev-utils/clearConsole');
 const drawHaystack = require('../utils/drawHaystack');
-const errorHandler = require('./middlewares/errorHandler');
+const errorHandler = require('./middlewares/errorHandler').default;
 const express = require('express');
 const fs = require('fs');
 const path = require('path');
 
-const isInteractive = process.stdout.isTTY;
-const rootDir = require('path').resolve(__dirname, '..', '..');
+const rootDir: string = require('path').resolve(__dirname, '..', '..');
 
 // HOT RELOAD: preload application so it will be loaded directly after removing cache
 // and it will not wait for user interacation :D
@@ -31,140 +53,115 @@ const preloadApplication = () => {
     console.log(chalk.green('♥ Application preload finished'));
     return true;
   } catch (error) {
-    console.error(chalk.red('❌  Unable to preload application because of syntax error'));
+    console.error(
+      chalk.red('❌  Unable to preload application because of syntax error'),
+    );
     console.log();
     console.error(error);
     return false;
   }
-};
-
-// HOT RELOAD: Reloading code in running node application without need of restart
-// https://medium.com/@kevinsimper/dont-use-nodemon-there-are-better-ways-fc016b50b45e#.gn0pnlbnb
+}; // HOT RELOAD: Reloading code in running node application without need of restart // https://medium.com/@kevinsimper/dont-use-nodemon-there-are-better-ways-fc016b50b45e#.gn0pnlbnb
 const watchChanges = () => {
-  const watcher = require('chokidar'); // eslint-disable-line import/no-extraneous-dependencies, global-require
-  const ignoreRegexp = /([/\\]\.)|(\.json$)/;
-  const sourceFilesRegexp = new RegExp(path.resolve(__dirname, '..'));
-
-  // Chokidar is watching for file changes in src directory and ignoring dotfiles and *.json
-  watcher.watch(path.join(__dirname, '..'), { ignored: ignoreRegexp }).on('all', (event, file) => {
-    if (event === 'change') {
-      if (isInteractive) { clearConsole(); }
-      console.log(chalk.red('NODE HOT RELOAD:'), ' Changes detected in ', chalk.yellow(path.relative(rootDir, file)));
-      timer.start();
-
-      // remember cache size
-      const originalCacheSize = Object.keys(require.cache).length;
-
-      // remove all files from require cache which are in ./src/ directory
-      // this will force next call of require to load files again
-      Object.keys(require.cache).forEach((id) => {
-        if (sourceFilesRegexp.test(id)) delete require.cache[id];
-      });
-
-      // enforce node to cache main.js directly after removing cache
-      // This speeds up development process - after change node is caching new changed content
-      // and user will get faster response
-      if (originalCacheSize !== Object.keys(require.cache).length) {
-        if (preloadApplication()) {
-          console.log(
-            `${chalk.green('NODE HOT RELOAD:')} Caching new version finished in ${chalk.green('%dms')} at %s`,
-            timer.get(),
-            new Date()
-          );
+  const watcher: Watcher = require('chokidar'); // eslint-disable-line import/no-extraneous-dependencies, global-require
+  const ignoreRegexp: RegExp = /([\\]\.)|(\.json$)/;
+  const sourceFilesRegexp: RegExp = new RegExp(path.resolve(__dirname, '..')); // Chokidar is watching for file changes in src directory and ignoring dotfiles and *.json
+  watcher
+    .watch(path.join(__dirname, '..'), { ignored: ignoreRegexp })
+    .on('all', (event : string, file: string) => {
+      if (event === 'change') {
+        clearConsole();
+        console.log(
+          chalk.red('NODE HOT RELOAD:'),
+          ' Changes detected in ',
+          chalk.yellow(path.relative(rootDir, file)),
+        );
+        timer.start(); // remember cache size
+        const originalCacheSize: number = Object.keys(require.cache).length; // remove all files from require cache which are in ./src/ directory // this will force next call of require to load files again
+        Object.keys(require.cache).forEach((id : string) => {
+          if (sourceFilesRegexp.test(id)) delete require.cache[id];
+        }); // enforce node to cache main.js directly after removing cache // This speeds up development process - after change node is caching new changed content // and user will get faster response
+        if (originalCacheSize !== Object.keys(require.cache).length) {
+          if (preloadApplication()) {
+            console.log(
+              `${chalk.green('NODE HOT RELOAD:')} Caching new version finished in ${chalk.green('%dms')} at %s`,
+              timer.get(),
+              new Date(),
+            );
+          }
         }
       }
-    }
-  });
-};
-
-// Create express app
+    });
+}; // Create express app
 const app = express();
-
 const webpackMiddleware = require('webpack-dev-middleware');
 const webpackHotMiddleware = require('webpack-hot-middleware');
 const webpackIsomorphicAssets = require('../../webpack/assets');
 const WebpackIsomorphicTools = require('webpack-isomorphic-tools');
 const webpack = require('webpack');
-const config = require('../../webpack/webpack.config');
-
-global.webpackIsomorphicTools = new WebpackIsomorphicTools(webpackIsomorphicAssets)
-  .server(rootDir, () => console.log('Webpack isomorphic tools started.'));
-
-// Make express to listen on port
-const port = process.env.PORT || 8000;
+const config: Config = require('../../webpack/webpack.config');
 
+const webpackIsomorphicTools: IsomorphicTools = new WebpackIsomorphicTools(
+  webpackIsomorphicAssets,
+).server(rootDir, () => console.log('Webpack isomorphic tools started.'));
+global.webpackIsomorphicTools = webpackIsomorphicTools; // Make express to listen on port
+const port: string = process.env.PORT || '8000';
 if (process.env.NODE_ENV === 'development') {
   const options = {
     key: fs.readFileSync(path.join(__dirname, '/cert/server.key')),
-    cert: fs.readFileSync(path.join(__dirname, '/cert/server.crt'))
+    cert: fs.readFileSync(path.join(__dirname, '/cert/server.crt')),
   };
-
   const spdy = require('spdy'); // eslint-disable-line global-require
   const compiler = webpack(config);
   const middleware = webpackMiddleware(compiler, {
     publicPath: config.output.publicPath,
     contentBase: 'src',
-    noInfo: true
-  });
-
-  // Refresh isomorphic tools on every call which enforce correct checkusum
-  app.use((req, res, next) => {
+    noInfo: true,
+  }); // Refresh isomorphic tools on every call which enforce correct checkusum
+  app.use((req: $Request, res: $Response, next: Function) => {
     webpackIsomorphicTools.refresh();
     next();
   });
-
   app.use(middleware);
   app.use(webpackHotMiddleware(compiler));
-
-  spdy
-    .createServer(options, app)
-    .listen(port, (error) => {
-      if (error) {
-        console.error(error);
-        return process.exit(1);
-      }
-      watchChanges();
-      return undefined;
-    });
+  spdy.createServer(options, app).listen(port, (error: Error) : void => {
+    if (error) {
+      console.error(error);
+      return process.exit(1);
+    }
+    watchChanges();
+    return undefined;
+  });
 } else {
   app.listen(port);
-}
-
-
-// HOT RELOAD: We need to require('./main') in every call to express app
-// When application is required and in cache it will not slow it down
-// But for development it is crucial for reload to perform require on every call.
-app.use((req, res, cb) => {
+} // HOT RELOAD: We need to require('./main') in every call to express app // When application is required and in cache it will not slow it down // But for development it is crucial for reload to perform require on every call.
+app.use((req: $Request, res: $Response, cb: Function) => {
   try {
-    require('./main')(req, res, cb); // eslint-disable-line global-require
+    require('./main').default(req, res, cb); // eslint-disable-line global-require
   } catch (error) {
     // This error handling is for developer to see nice formated output
     // of node in browser whe it was not able to load code
     errorHandler(error, req, res);
   }
-});
-
-// This is most simple error handler which will show error,
-// when there is some error in other error handlers
-app.use((err, req, res, next) => { // eslint-disable-line no-unused-vars
+}); // This is most simple error handler which will show error, // when there is some error in other error handlers
+app.use((err: Error, req: $Request, res: $Response) => {
+  // eslint-disable-line no-unused-vars
   console.error(chalk.red('Last resort error handler catched'), err.stack);
-  res.status(500).send(`
+  res.status(500).send(
+    `
     Last resort error handler caught error at path: ${req.path}
-    ${err.stack.toString().replace(/\[\d+m/mg, '')}
-  `);
-});
-
-// HOT RELOAD: enforce node to cache main.js so first request will be already from cache
+    ${err.stack.toString().replace(/\[\d+m/gm, '')}
+  `,
+  );
+}); // HOT RELOAD: enforce node to cache main.js so first request will be already from cache
 if (preloadApplication()) {
   if (process.env.NODE_ENV === 'development') {
     drawHaystack();
   }
-
   console.log(
     'Server started in %sms at port %s in %s ENV and %s APP ENV',
     chalk.green(timer.get()),
     chalk.blue(port),
     chalk.yellow(process.env.NODE_ENV),
-    chalk.red(process.env.APP_ENV)
+    chalk.red(process.env.APP_ENV),
   );
 }
diff --git a/src/server/main.js b/src/server/main.js
index 6430789..4317648 100644
--- a/src/server/main.js
+++ b/src/server/main.js
@@ -1,13 +1,15 @@
+// @flow
 import compression from 'compression';
 import cookieParser from 'cookie-parser';
 import express from 'express';
+import type { Express } from 'express';
 import helmet from 'helmet';
 import morgan from 'morgan';
 import rollbar from 'rollbar';
 import errorHandler from './middlewares/errorHandler';
 import frontend from './frontend';
 
-const app = express();
+const app : Express = express();
 
 // Security
 app.disable('x-powered-by');
diff --git a/src/server/middlewares/errorHandler.js b/src/server/middlewares/errorHandler.js
index 78cd0a1..784d951 100644
--- a/src/server/middlewares/errorHandler.js
+++ b/src/server/middlewares/errorHandler.js
@@ -1,8 +1,10 @@
+// @flow
 import PrettyError from 'pretty-error';
+import type { $Request, $Response } from 'express';
 
 const prettyError = new PrettyError();
 
-export default function errorHandler(err, req, res, next) { // eslint-disable-line no-unused-vars
+export default function errorHandler(err: Error, req: $Request, res: $Response, next? :Function) { // eslint-disable-line no-unused-vars
   const stackOutput = prettyError.render(err, false, true)
     .replace(/\[1m/mg, '<span style="color: red">')
     .replace(/\[97m/mg, '<span style="color: red">')
diff --git a/src/utils/timer.js b/src/utils/timer.js
index 4532ef6..6a3c7d7 100644
--- a/src/utils/timer.js
+++ b/src/utils/timer.js
@@ -1,9 +1,10 @@
-let startTime;
+// @flow
+let startTime : Date;
 
-export function start() {
+export function start(): void {
   startTime = new Date();
 }
 
-export function get() {
+export function get(): number {
   return new Date() - startTime;
 }
diff --git a/yarn.lock b/yarn.lock
index 4f8a85d..b9c3c27 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -231,6 +231,27 @@ aws4@^1.2.1:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/aws4/-/aws4-1.5.0.tgz#0a29ffb79c31c9e712eeb087e8e7a64b4a56d755"
 
+babel-cli@^6.24.0:
+  version "6.24.0"
+  resolved "https://registry.yarnpkg.com/babel-cli/-/babel-cli-6.24.0.tgz#a05ffd210dca0c288a26d5319c5ac8669a265ad0"
+  dependencies:
+    babel-core "^6.24.0"
+    babel-polyfill "^6.23.0"
+    babel-register "^6.24.0"
+    babel-runtime "^6.22.0"
+    commander "^2.8.1"
+    convert-source-map "^1.1.0"
+    fs-readdir-recursive "^1.0.0"
+    glob "^7.0.0"
+    lodash "^4.2.0"
+    output-file-sync "^1.1.0"
+    path-is-absolute "^1.0.0"
+    slash "^1.0.0"
+    source-map "^0.5.0"
+    v8flags "^2.0.10"
+  optionalDependencies:
+    chokidar "^1.6.1"
+
 babel-code-frame@^6.16.0, babel-code-frame@^6.22.0:
   version "6.22.0"
   resolved "https://registry.yarnpkg.com/babel-code-frame/-/babel-code-frame-6.22.0.tgz#027620bee567a88c32561574e7fd0801d33118e4"
@@ -239,7 +260,31 @@ babel-code-frame@^6.16.0, babel-code-frame@^6.22.0:
     esutils "^2.0.2"
     js-tokens "^3.0.0"
 
-babel-core@^6.0.0, babel-core@^6.22.0:
+babel-core@^6.0.0, babel-core@^6.24.0:
+  version "6.24.0"
+  resolved "https://registry.yarnpkg.com/babel-core/-/babel-core-6.24.0.tgz#8f36a0a77f5c155aed6f920b844d23ba56742a02"
+  dependencies:
+    babel-code-frame "^6.22.0"
+    babel-generator "^6.24.0"
+    babel-helpers "^6.23.0"
+    babel-messages "^6.23.0"
+    babel-register "^6.24.0"
+    babel-runtime "^6.22.0"
+    babel-template "^6.23.0"
+    babel-traverse "^6.23.1"
+    babel-types "^6.23.0"
+    babylon "^6.11.0"
+    convert-source-map "^1.1.0"
+    debug "^2.1.1"
+    json5 "^0.5.0"
+    lodash "^4.2.0"
+    minimatch "^3.0.2"
+    path-is-absolute "^1.0.0"
+    private "^0.1.6"
+    slash "^1.0.0"
+    source-map "^0.5.0"
+
+babel-core@^6.22.0:
   version "6.22.1"
   resolved "https://registry.yarnpkg.com/babel-core/-/babel-core-6.22.1.tgz#9c5fd658ba1772d28d721f6d25d968fc7ae21648"
   dependencies:
@@ -273,7 +318,20 @@ babel-eslint@^7.1.1:
     babylon "^6.13.0"
     lodash.pickby "^4.6.0"
 
-babel-generator@^6.18.0, babel-generator@^6.22.0:
+babel-generator@^6.18.0, babel-generator@^6.24.0:
+  version "6.24.0"
+  resolved "https://registry.yarnpkg.com/babel-generator/-/babel-generator-6.24.0.tgz#eba270a8cc4ce6e09a61be43465d7c62c1f87c56"
+  dependencies:
+    babel-messages "^6.23.0"
+    babel-runtime "^6.22.0"
+    babel-types "^6.23.0"
+    detect-indent "^4.0.0"
+    jsesc "^1.3.0"
+    lodash "^4.2.0"
+    source-map "^0.5.0"
+    trim-right "^1.0.1"
+
+babel-generator@^6.22.0:
   version "6.22.0"
   resolved "https://registry.yarnpkg.com/babel-generator/-/babel-generator-6.22.0.tgz#d642bf4961911a8adc7c692b0c9297f325cda805"
   dependencies:
@@ -412,6 +470,13 @@ babel-helpers@^6.22.0:
     babel-runtime "^6.22.0"
     babel-template "^6.22.0"
 
+babel-helpers@^6.23.0:
+  version "6.23.0"
+  resolved "https://registry.yarnpkg.com/babel-helpers/-/babel-helpers-6.23.0.tgz#4f8f2e092d0b6a8808a4bde79c27f1e2ecf0d992"
+  dependencies:
+    babel-runtime "^6.22.0"
+    babel-template "^6.23.0"
+
 babel-jest@^18.0.0:
   version "18.0.0"
   resolved "https://registry.yarnpkg.com/babel-jest/-/babel-jest-18.0.0.tgz#17ebba8cb3285c906d859e8707e4e79795fb65e3"
@@ -435,6 +500,12 @@ babel-messages@^6.22.0:
   dependencies:
     babel-runtime "^6.22.0"
 
+babel-messages@^6.23.0:
+  version "6.23.0"
+  resolved "https://registry.yarnpkg.com/babel-messages/-/babel-messages-6.23.0.tgz#f3cdf4703858035b2a2951c6ec5edf6c62f2630e"
+  dependencies:
+    babel-runtime "^6.22.0"
+
 babel-plugin-add-module-exports@^0.2.1:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-add-module-exports/-/babel-plugin-add-module-exports-0.2.1.tgz#9ae9a1f4a8dc67f0cdec4f4aeda1e43a5ff65e25"
@@ -825,6 +896,14 @@ babel-polyfill@^6.20.0:
     core-js "^2.4.0"
     regenerator-runtime "^0.10.0"
 
+babel-polyfill@^6.23.0:
+  version "6.23.0"
+  resolved "https://registry.yarnpkg.com/babel-polyfill/-/babel-polyfill-6.23.0.tgz#8364ca62df8eafb830499f699177466c3b03499d"
+  dependencies:
+    babel-runtime "^6.22.0"
+    core-js "^2.4.0"
+    regenerator-runtime "^0.10.0"
+
 babel-preset-es2015-node6@^0.4.0:
   version "0.4.0"
   resolved "https://registry.yarnpkg.com/babel-preset-es2015-node6/-/babel-preset-es2015-node6-0.4.0.tgz#f8893f81b6533747924c657348867bd63b4f9dc2"
@@ -863,6 +942,12 @@ babel-preset-es2015@^6.18.0:
     babel-plugin-transform-es2015-unicode-regex "^6.22.0"
     babel-plugin-transform-regenerator "^6.22.0"
 
+babel-preset-flow@^6.23.0:
+  version "6.23.0"
+  resolved "https://registry.yarnpkg.com/babel-preset-flow/-/babel-preset-flow-6.23.0.tgz#e71218887085ae9a24b5be4169affb599816c49d"
+  dependencies:
+    babel-plugin-transform-flow-strip-types "^6.22.0"
+
 babel-preset-jest@^18.0.0:
   version "18.0.0"
   resolved "https://registry.yarnpkg.com/babel-preset-jest/-/babel-preset-jest-18.0.0.tgz#84faf8ca3ec65aba7d5e3f59bbaed935ab24049e"
@@ -908,7 +993,7 @@ babel-preset-stage-3@^6.22.0:
     babel-plugin-transform-exponentiation-operator "^6.22.0"
     babel-plugin-transform-object-rest-spread "^6.22.0"
 
-babel-register@^6.18.0, babel-register@^6.22.0:
+babel-register@^6.18.0:
   version "6.22.0"
   resolved "https://registry.yarnpkg.com/babel-register/-/babel-register-6.22.0.tgz#a61dd83975f9ca4a9e7d6eff3059494cd5ea4c63"
   dependencies:
@@ -920,6 +1005,18 @@ babel-register@^6.18.0, babel-register@^6.22.0:
     mkdirp "^0.5.1"
     source-map-support "^0.4.2"
 
+babel-register@^6.22.0, babel-register@^6.24.0:
+  version "6.24.0"
+  resolved "https://registry.yarnpkg.com/babel-register/-/babel-register-6.24.0.tgz#5e89f8463ba9970356d02eb07dabe3308b080cfd"
+  dependencies:
+    babel-core "^6.24.0"
+    babel-runtime "^6.22.0"
+    core-js "^2.4.0"
+    home-or-tmp "^2.0.0"
+    lodash "^4.2.0"
+    mkdirp "^0.5.1"
+    source-map-support "^0.4.2"
+
 babel-runtime@^6.18.0, babel-runtime@^6.2.0, babel-runtime@^6.22.0, babel-runtime@^6.6.1:
   version "6.22.0"
   resolved "https://registry.yarnpkg.com/babel-runtime/-/babel-runtime-6.22.0.tgz#1cf8b4ac67c77a4ddb0db2ae1f74de52ac4ca611"
@@ -927,7 +1024,17 @@ babel-runtime@^6.18.0, babel-runtime@^6.2.0, babel-runtime@^6.22.0, babel-runtim
     core-js "^2.4.0"
     regenerator-runtime "^0.10.0"
 
-babel-template@^6.16.0, babel-template@^6.22.0, babel-template@^6.3.0:
+babel-template@^6.16.0, babel-template@^6.23.0:
+  version "6.23.0"
+  resolved "https://registry.yarnpkg.com/babel-template/-/babel-template-6.23.0.tgz#04d4f270adbb3aa704a8143ae26faa529238e638"
+  dependencies:
+    babel-runtime "^6.22.0"
+    babel-traverse "^6.23.0"
+    babel-types "^6.23.0"
+    babylon "^6.11.0"
+    lodash "^4.2.0"
+
+babel-template@^6.22.0, babel-template@^6.3.0:
   version "6.22.0"
   resolved "https://registry.yarnpkg.com/babel-template/-/babel-template-6.22.0.tgz#403d110905a4626b317a2a1fcb8f3b73204b2edb"
   dependencies:
@@ -937,7 +1044,7 @@ babel-template@^6.16.0, babel-template@^6.22.0, babel-template@^6.3.0:
     babylon "^6.11.0"
     lodash "^4.2.0"
 
-babel-traverse@^6.15.0, babel-traverse@^6.18.0, babel-traverse@^6.22.0, babel-traverse@^6.22.1:
+babel-traverse@^6.15.0, babel-traverse@^6.22.0, babel-traverse@^6.22.1:
   version "6.22.1"
   resolved "https://registry.yarnpkg.com/babel-traverse/-/babel-traverse-6.22.1.tgz#3b95cd6b7427d6f1f757704908f2fc9748a5f59f"
   dependencies:
@@ -951,7 +1058,21 @@ babel-traverse@^6.15.0, babel-traverse@^6.18.0, babel-traverse@^6.22.0, babel-tr
     invariant "^2.2.0"
     lodash "^4.2.0"
 
-babel-types@^6.15.0, babel-types@^6.18.0, babel-types@^6.19.0, babel-types@^6.22.0:
+babel-traverse@^6.18.0, babel-traverse@^6.23.0, babel-traverse@^6.23.1:
+  version "6.23.1"
+  resolved "https://registry.yarnpkg.com/babel-traverse/-/babel-traverse-6.23.1.tgz#d3cb59010ecd06a97d81310065f966b699e14f48"
+  dependencies:
+    babel-code-frame "^6.22.0"
+    babel-messages "^6.23.0"
+    babel-runtime "^6.22.0"
+    babel-types "^6.23.0"
+    babylon "^6.15.0"
+    debug "^2.2.0"
+    globals "^9.0.0"
+    invariant "^2.2.0"
+    lodash "^4.2.0"
+
+babel-types@^6.15.0, babel-types@^6.22.0:
   version "6.22.0"
   resolved "https://registry.yarnpkg.com/babel-types/-/babel-types-6.22.0.tgz#2a447e8d0ea25d2512409e4175479fd78cc8b1db"
   dependencies:
@@ -960,6 +1081,15 @@ babel-types@^6.15.0, babel-types@^6.18.0, babel-types@^6.19.0, babel-types@^6.22
     lodash "^4.2.0"
     to-fast-properties "^1.0.1"
 
+babel-types@^6.18.0, babel-types@^6.19.0, babel-types@^6.23.0:
+  version "6.23.0"
+  resolved "https://registry.yarnpkg.com/babel-types/-/babel-types-6.23.0.tgz#bb17179d7538bad38cd0c9e115d340f77e7e9acf"
+  dependencies:
+    babel-runtime "^6.22.0"
+    esutils "^2.0.2"
+    lodash "^4.2.0"
+    to-fast-properties "^1.0.1"
+
 babylon@^6.11.0, babylon@^6.13.0, babylon@^6.15.0:
   version "6.15.0"
   resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.15.0.tgz#ba65cfa1a80e1759b0e89fb562e27dccae70348e"
@@ -1306,7 +1436,7 @@ combined-stream@^1.0.5, combined-stream@~1.0.5:
   dependencies:
     delayed-stream "~1.0.0"
 
-commander@2.9.x, commander@^2.9.0:
+commander@2.9.x, commander@^2.8.1, commander@^2.9.0:
   version "2.9.0"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.9.0.tgz#9c99094176e12240cb22d6c5146098400fe0f7d4"
   dependencies:
@@ -2212,6 +2342,10 @@ flat-cache@^1.2.1:
     graceful-fs "^4.1.2"
     write "^0.2.1"
 
+flow-bin@^0.42.0:
+  version "0.42.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.42.0.tgz#05dd754b6b052de7b150f9210e2160746961e3cf"
+
 for-in@^0.1.5:
   version "0.1.6"
   resolved "https://registry.yarnpkg.com/for-in/-/for-in-0.1.6.tgz#c9f96e89bfad18a545af5ec3ed352a1d9e5b4dc8"
@@ -2260,6 +2394,10 @@ fs-extra@^0.30.0:
     path-is-absolute "^1.0.0"
     rimraf "^2.2.8"
 
+fs-readdir-recursive@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/fs-readdir-recursive/-/fs-readdir-recursive-1.0.0.tgz#8cd1745c8b4f8a29c8caec392476921ba195f560"
+
 fs.realpath@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
@@ -2373,7 +2511,7 @@ globby@^5.0.0:
     pify "^2.0.0"
     pinkie-promise "^2.0.0"
 
-graceful-fs@^4.1.2, graceful-fs@^4.1.6, graceful-fs@^4.1.9:
+graceful-fs@^4.1.2, graceful-fs@^4.1.4, graceful-fs@^4.1.6, graceful-fs@^4.1.9:
   version "4.1.11"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.11.tgz#0e8bdfe4d1ddb8854d64e04ea7c00e2a026e5658"
 
@@ -3844,6 +3982,14 @@ os-tmpdir@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/os-tmpdir/-/os-tmpdir-1.0.2.tgz#bbe67406c79aa85c5cfec766fe5734555dfa1274"
 
+output-file-sync@^1.1.0:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/output-file-sync/-/output-file-sync-1.1.2.tgz#d0a33eefe61a205facb90092e826598d5245ce76"
+  dependencies:
+    graceful-fs "^4.1.4"
+    mkdirp "^0.5.1"
+    object-assign "^4.1.0"
+
 pako@~0.2.0:
   version "0.2.9"
   resolved "https://registry.yarnpkg.com/pako/-/pako-0.2.9.tgz#f3f7522f4ef782348da8161bad9ecfd51bf83a75"
@@ -4797,6 +4943,10 @@ traverse-chain@~0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/traverse-chain/-/traverse-chain-0.1.0.tgz#61dbc2d53b69ff6091a12a168fd7d433107e40f1"
 
+trim-right@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/trim-right/-/trim-right-1.0.1.tgz#cb2e1203067e0c8de1f614094b9fe45704ea6003"
+
 tryit@^1.0.1:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/tryit/-/tryit-1.0.3.tgz#393be730a9446fd1ead6da59a014308f36c289cb"
@@ -4887,6 +5037,10 @@ url@^0.11.0:
     punycode "1.3.2"
     querystring "0.2.0"
 
+user-home@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/user-home/-/user-home-1.1.1.tgz#2b5be23a32b63a7c9deb8d0f28d485724a3df190"
+
 user-home@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/user-home/-/user-home-2.0.0.tgz#9c70bfd8169bc1dcbf48604e0f04b8b49cde9e9f"
@@ -4923,6 +5077,12 @@ uuid@^3.0.0, uuid@~3.0.0:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-3.0.1.tgz#6544bba2dfda8c1cf17e629a3a305e2bb1fee6c1"
 
+v8flags@^2.0.10:
+  version "2.0.11"
+  resolved "https://registry.yarnpkg.com/v8flags/-/v8flags-2.0.11.tgz#bca8f30f0d6d60612cc2c00641e6962d42ae6881"
+  dependencies:
+    user-home "^1.1.1"
+
 validate-npm-package-license@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/validate-npm-package-license/-/validate-npm-package-license-3.0.1.tgz#2804babe712ad3379459acfbe24746ab2c303fbc"