diff --git a/.yarnrc b/.yarnrc
new file mode 100644
index 000000000..07e44a9a5
--- /dev/null
+++ b/.yarnrc
@@ -0,0 +1,3 @@
+--install.no-lockfile true
+--install.check-files true
+--add.no-lockfile true
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
new file mode 100644
index 000000000..55203be74
--- /dev/null
+++ b/CODE_OF_CONDUCT.md
@@ -0,0 +1,3 @@
+# Code of Conduct
+
+Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please [read the full text](https://code.facebook.com/pages/876921332402685/open-source-code-of-conduct) so that you can understand what actions will and will not be tolerated.
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 86b392f2f..72994ebbf 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -75,20 +75,18 @@ All functionality must be retained (and configuration given to the user) if they
 
 1. Clone the repo with `git clone https://github.com/facebookincubator/create-react-app`
 
-2. Run `npm install` in the root `create-react-app` folder.
+2. Run `yarn` in the root `create-react-app` folder.
 
-Once it is done, you can modify any file locally and run `npm start`, `npm test` or `npm run build` just like in a generated project.
+Once it is done, you can modify any file locally and run `yarn start`, `yarn test` or `yarn build` just like in a generated project.
 
 If you want to try out the end-to-end flow with the global CLI, you can do this too:
 
 ```
-npm run create-react-app my-app
+yarn create-react-app my-app
 cd my-app
 ```
 
-and then run `npm start` or `npm run build`.
-
-*Note: if you are using yarn, we suggest that you use `yarn install --no-lockfile` instead of the bare `yarn` or `yarn install` because we [intentionally](https://github.com/facebookincubator/create-react-app/pull/2014#issuecomment-300811661) do not ignore or add yarn.lock to our repo.*
+and then run `yarn start` or `yarn build`.
 
 ## Contributing to E2E (end to end) tests
 
@@ -96,6 +94,21 @@ and then run `npm start` or `npm run build`.
 
 More detailed information are in the dedicated [README](/packages/react-scripts/fixtures/kitchensink/README.md).
 
+## Tips for contributors using Windows
+
+The scripts in tasks folder and other scripts in `package.json` will not work in Windows out of the box. However, using [Bash on  windows](https://msdn.microsoft.com/en-us/commandline/wsl/about) makes it easier to use those scripts without any workarounds. The steps to do so are detailed below: 
+
+### Install Bash on Ubuntu on Windows
+
+A good step by step guide can be found [here](https://www.howtogeek.com/249966/how-to-install-and-use-the-linux-bash-shell-on-windows-10/)
+
+### Install Node.js and yarn
+Even if you have node and yarn installed on your windows, it would not be accessible from the bash shell. You would have to install it again. Installing via [`nvm`](https://github.com/creationix/nvm#install-script) is recommended.
+
+### Line endings
+
+By default git would use `CRLF` line endings which would cause the scripts to fail. You can change it for this repo only by setting `autocrlf` to false by running `git config core.autocrlf false`. You can also enable it for all your repos by using the `--global` flag if you wish to do so.
+
 ## Cutting a Release
 
 1. Tag all merged pull requests that go into the release with the relevant milestone. Each merged PR should also be labeled with one of the [labels](https://github.com/facebookincubator/create-react-app/labels) named `tag: ...` to indicate what kind of change it is.
@@ -104,11 +117,11 @@ More detailed information are in the dedicated [README](/packages/react-scripts/
 4. Note that files in `packages/create-react-app` should be modified with extreme caution. Since it’s a global CLI, any version of `create-react-app` (global CLI) including very old ones should work with the latest version of `react-scripts`.
 5. Create a change log entry for the release:
   * You'll need an [access token for the GitHub API](https://help.github.com/articles/creating-an-access-token-for-command-line-use/). Save it to this environment variable: `export GITHUB_AUTH="..."`
-  * Run `npm run changelog`. The command will find all the labeled pull requests merged since the last release and group them by the label and affected packages, and create a change log entry with all the changes and links to PRs and their authors. Copy and paste it to `CHANGELOG.md`.
+  * Run `yarn changelog`. The command will find all the labeled pull requests merged since the last release and group them by the label and affected packages, and create a change log entry with all the changes and links to PRs and their authors. Copy and paste it to `CHANGELOG.md`.
   * Add a four-space indented paragraph after each non-trivial list item, explaining what changed and why. For each breaking change also write who it affects and instructions for migrating existing code.
   * Maybe add some newlines here and there. Preview the result on GitHub to get a feel for it. Changelog generator output is a bit too terse for my taste, so try to make it visually pleasing and well grouped.
 6. Make sure to include “Migrating from ...” instructions for the previous release. Often you can copy and paste them.
-7. **Do not run `npm publish`. Instead, run `npm run publish`.**
+7. Run `npm run publish`. (It has to be `npm run publish` exactly, not just `npm publish` or `yarn publish`.)
 8. Wait for a long time, and it will get published. Don’t worry that it’s stuck. In the end the publish script will prompt for versions before publishing the packages.
 9. After publishing, create a GitHub Release with the same text as the changelog entry. See previous Releases for inspiration.
 
diff --git a/appveyor.yml b/appveyor.yml
index ffe48fc85..5d957aa7e 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -28,8 +28,6 @@ platform:
   - x64
 
 install:
-  # TODO: Remove after https://github.com/appveyor/ci/issues/1426 is fixed
-  - set PATH=C:\Program Files\Git\mingw64\bin;%PATH%
   - ps: Install-Product node $env:nodejs_version $env:platform
 
 build: off
@@ -41,4 +39,4 @@ skip_commits:
 test_script:
   - node --version
   - npm --version
-  - sh tasks/e2e-%test_suite%.sh
+  - bash tasks/e2e-%test_suite%.sh
diff --git a/lerna.json b/lerna.json
index 1673f8a31..f1d78d84b 100644
--- a/lerna.json
+++ b/lerna.json
@@ -1,5 +1,7 @@
 {
-  "lerna": "2.0.0",
+  "lerna": "2.6.0",
+  "npmClient": "yarn",
+  "useWorkspaces": true,
   "version": "independent",
   "changelog": {
     "repo": "facebookincubator/create-react-app",
@@ -12,8 +14,5 @@
       "tag: internal": ":house: Internal"
     },
     "cacheDir": ".changelog"
-  },
-  "packages": [
-    "packages/*"
-  ]
+  }
 }
diff --git a/packages/babel-preset-react-app/README.md b/packages/babel-preset-react-app/README.md
index 4dc9fb9b1..5653831ac 100644
--- a/packages/babel-preset-react-app/README.md
+++ b/packages/babel-preset-react-app/README.md
@@ -16,6 +16,12 @@ If you want to use this Babel preset in a project not built with Create React Ap
 
 First, [install Babel](https://babeljs.io/docs/setup/).
 
+Then install babel-preset-react-app.
+
+```sh
+npm install babel-preset-react-app --save-dev
+```
+
 Then create a file named `.babelrc` with following contents in the root folder of your project:
 
   ```js
diff --git a/packages/babel-preset-react-app/index.js b/packages/babel-preset-react-app/index.js
index 0d961af6f..d90fb6af5 100644
--- a/packages/babel-preset-react-app/index.js
+++ b/packages/babel-preset-react-app/index.js
@@ -7,6 +7,10 @@
 'use strict';
 
 const plugins = [
+  // Necessary to include regardless of the environment because
+  // in practice some other transforms (such as object-rest-spread)
+  // don't work without it: https://github.com/babel/babel/issues/7215
+  require.resolve('babel-plugin-transform-es2015-destructuring'),
   // class { handleClick = () => { } }
   require.resolve('babel-plugin-transform-class-properties'),
   // The following two plugins use Object.assign directly, instead of Babel's
diff --git a/packages/babel-preset-react-app/package.json b/packages/babel-preset-react-app/package.json
index f020f99e0..c6a7e2944 100644
--- a/packages/babel-preset-react-app/package.json
+++ b/packages/babel-preset-react-app/package.json
@@ -1,6 +1,6 @@
 {
   "name": "babel-preset-react-app",
-  "version": "3.1.0",
+  "version": "3.1.1",
   "description": "Babel preset used by Create React App",
   "repository": "facebookincubator/create-react-app",
   "license": "MIT",
@@ -14,6 +14,7 @@
     "babel-plugin-dynamic-import-node": "1.1.0",
     "babel-plugin-syntax-dynamic-import": "6.18.0",
     "babel-plugin-transform-class-properties": "6.24.1",
+    "babel-plugin-transform-es2015-destructuring": "6.23.0",
     "babel-plugin-transform-object-rest-spread": "6.26.0",
     "babel-plugin-transform-react-constant-elements": "6.23.0",
     "babel-plugin-transform-react-jsx": "6.24.1",
diff --git a/packages/create-react-app/createReactApp.js b/packages/create-react-app/createReactApp.js
index 00fbb5e16..88e533664 100755
--- a/packages/create-react-app/createReactApp.js
+++ b/packages/create-react-app/createReactApp.js
@@ -47,6 +47,7 @@ const tmp = require('tmp');
 const unpack = require('tar-pack').unpack;
 const url = require('url');
 const hyperquest = require('hyperquest');
+const envinfo = require('envinfo');
 
 const packageJson = require('./package.json');
 
@@ -60,10 +61,12 @@ const program = new commander.Command(packageJson.name)
     projectName = name;
   })
   .option('--verbose', 'print additional logs')
+  .option('--info', 'print environment debug info')
   .option(
     '--scripts-version <alternative-package>',
     'use a non-standard version of react-scripts'
   )
+  .option('--use-npm')
   .allowUnknownOption()
   .on('--help', () => {
     console.log(`    Only ${chalk.green('<project-directory>')} is required.`);
@@ -78,6 +81,11 @@ const program = new commander.Command(packageJson.name)
     console.log(
       `      - a .tgz archive: ${chalk.green('https://mysite.com/my-react-scripts-0.8.2.tgz')}`
     );
+    console.log(
+      `      - a .tar.gz archive: ${chalk.green(
+        'https://mysite.com/my-react-scripts-0.8.2.tar.gz'
+      )}`
+    );
     console.log(
       `    It is not needed unless you specifically want to use a fork.`
     );
@@ -93,6 +101,14 @@ const program = new commander.Command(packageJson.name)
   .parse(process.argv);
 
 if (typeof projectName === 'undefined') {
+  if (program.info) {
+    envinfo.print({
+      packages: ['react', 'react-dom', 'react-scripts'],
+      noNativeIDE: true,
+      duplicates: true,
+    });
+    process.exit(0);
+  }
   console.error('Please specify the project directory:');
   console.log(
     `  ${chalk.cyan(program.name())} ${chalk.green('<project-directory>')}`
@@ -127,10 +143,11 @@ createApp(
   projectName,
   program.verbose,
   program.scriptsVersion,
+  program.useNpm,
   hiddenProgram.internalTestingTemplate
 );
 
-function createApp(name, verbose, version, template) {
+function createApp(name, verbose, version, useNpm, template) {
   const root = path.resolve(name);
   const appName = path.basename(root);
 
@@ -153,7 +170,7 @@ function createApp(name, verbose, version, template) {
     JSON.stringify(packageJson, null, 2)
   );
 
-  const useYarn = shouldUseYarn();
+  const useYarn = useNpm ? false : shouldUseYarn();
   const originalDirectory = process.cwd();
   process.chdir(root);
   if (!useYarn && !checkThatNpmCanReadCwd()) {
@@ -260,7 +277,7 @@ function run(
   template,
   useYarn
 ) {
-  const packageToInstall = getInstallPackage(version);
+  const packageToInstall = getInstallPackage(version, originalDirectory);
   const allDependencies = ['react', 'react-dom', packageToInstall];
 
   console.log('Installing packages. This might take a couple of minutes.');
@@ -351,11 +368,16 @@ function run(
     });
 }
 
-function getInstallPackage(version) {
+function getInstallPackage(version, originalDirectory) {
   let packageToInstall = 'react-scripts';
   const validSemver = semver.valid(version);
   if (validSemver) {
     packageToInstall += `@${validSemver}`;
+  } else if (version && version.match(/^file:/)) {
+    packageToInstall = `file:${path.resolve(
+      originalDirectory,
+      version.match(/^file:(.*)?$/)[1]
+    )}`;
   } else if (version) {
     // for tar.gz or alternative paths
     packageToInstall = version;
@@ -403,7 +425,7 @@ function extractStream(stream, dest) {
 
 // Extract package name from tarball url or path.
 function getPackageName(installPackage) {
-  if (installPackage.indexOf('.tgz') > -1) {
+  if (installPackage.match(/^.+\.(tgz|tar\.gz)$/)) {
     return getTemporaryDirectory()
       .then(obj => {
         let stream;
@@ -426,7 +448,7 @@ function getPackageName(installPackage) {
           `Could not extract the package name from the archive: ${err.message}`
         );
         const assumedProjectName = installPackage.match(
-          /^.+\/(.+?)(?:-\d+.+)?\.tgz$/
+          /^.+\/(.+?)(?:-\d+.+)?\.(tgz|tar\.gz)$/
         )[1];
         console.log(
           `Based on the filename, assuming it is "${chalk.cyan(assumedProjectName)}"`
@@ -443,6 +465,10 @@ function getPackageName(installPackage) {
     return Promise.resolve(
       installPackage.charAt(0) + installPackage.substr(1).split('@')[0]
     );
+  } else if (installPackage.match(/^file:/)) {
+    const installPackagePath = installPackage.match(/^file:(.*)?$/)[1];
+    const installPackageJson = require(path.join(installPackagePath, 'package.json'));
+    return Promise.resolve(installPackageJson.name);
   }
   return Promise.resolve(installPackage);
 }
@@ -571,6 +597,12 @@ function isSafeToCreateProjectIn(root, name) {
     '.hg',
     '.hgignore',
     '.hgcheck',
+    '.npmignore',
+    'mkdocs.yml',
+    'docs',
+    '.travis.yml',
+    '.gitlab-ci.yml',
+    '.gitattributes',
   ];
   console.log();
 
@@ -596,6 +628,21 @@ function isSafeToCreateProjectIn(root, name) {
   return false;
 }
 
+function getProxy() {
+  if (process.env.https_proxy) {
+    return process.env.https_proxy;
+  } else {
+    try {
+      // Trying to read https-proxy from .npmrc
+      let httpsProxy = execSync('npm config get https-proxy')
+        .toString()
+        .trim();
+      return httpsProxy !== 'null' ? httpsProxy : undefined;
+    } catch (e) {
+      return;
+    }
+  }
+}
 function checkThatNpmCanReadCwd() {
   const cwd = process.cwd();
   let childOutput = null;
@@ -660,10 +707,11 @@ function checkIfOnline(useYarn) {
 
   return new Promise(resolve => {
     dns.lookup('registry.yarnpkg.com', err => {
-      if (err != null && process.env.https_proxy) {
+      let proxy;
+      if (err != null && (proxy = getProxy())) {
         // If a proxy is defined, we likely can't resolve external hostnames.
         // Try to resolve the proxy name as an indication of a connection.
-        dns.lookup(url.parse(process.env.https_proxy).hostname, proxyErr => {
+        dns.lookup(url.parse(proxy).hostname, proxyErr => {
           resolve(proxyErr == null);
         });
       } else {
diff --git a/packages/create-react-app/package.json b/packages/create-react-app/package.json
index 569985f5c..4d8f4112e 100644
--- a/packages/create-react-app/package.json
+++ b/packages/create-react-app/package.json
@@ -1,6 +1,6 @@
 {
   "name": "create-react-app",
-  "version": "1.4.3",
+  "version": "1.5.2",
   "keywords": [
     "react"
   ],
@@ -24,6 +24,7 @@
     "chalk": "^1.1.1",
     "commander": "^2.9.0",
     "cross-spawn": "^4.0.0",
+    "envinfo": "3.4.2",
     "fs-extra": "^1.0.0",
     "hyperquest": "^2.1.2",
     "semver": "^5.0.3",
diff --git a/packages/eslint-config-react-app/README.md b/packages/eslint-config-react-app/README.md
index 6918cda52..777b8f46e 100644
--- a/packages/eslint-config-react-app/README.md
+++ b/packages/eslint-config-react-app/README.md
@@ -45,7 +45,7 @@ The following rules from the [eslint-plugin-jsx-a11y](https://github.com/evcohen
 - [aria-role](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/aria-role.md)
 - [aria-unsupported-elements](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/aria-unsupported-elements.md)
 - [heading-has-content](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/heading-has-content.md)
-- [href-no-hash](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/href-no-hash.md)
+- [href-no-hash](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/v5.1.1/docs/rules/href-no-hash.md)
 - [iframe-has-title](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/iframe-has-title.md)
 - [img-redundant-alt](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/img-redundant-alt.md)
 - [no-access-key](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/no-access-key.md)
diff --git a/packages/eslint-config-react-app/index.js b/packages/eslint-config-react-app/index.js
index 9a1ec2276..81fbc45a5 100644
--- a/packages/eslint-config-react-app/index.js
+++ b/packages/eslint-config-react-app/index.js
@@ -116,7 +116,7 @@ module.exports = {
     'new-parens': 'warn',
     'no-array-constructor': 'warn',
     'no-caller': 'warn',
-    'no-cond-assign': ['warn', 'always'],
+    'no-cond-assign': ['warn', 'except-parens'],
     'no-const-assign': 'warn',
     'no-control-regex': 'warn',
     'no-delete-var': 'warn',
diff --git a/packages/eslint-config-react-app/package.json b/packages/eslint-config-react-app/package.json
index a10ef6799..c13b0417c 100644
--- a/packages/eslint-config-react-app/package.json
+++ b/packages/eslint-config-react-app/package.json
@@ -1,6 +1,6 @@
 {
   "name": "eslint-config-react-app",
-  "version": "2.0.1",
+  "version": "2.1.0",
   "description": "ESLint configuration used by Create React App",
   "repository": "facebookincubator/create-react-app",
   "license": "MIT",
diff --git a/packages/react-dev-utils/FileSizeReporter.js b/packages/react-dev-utils/FileSizeReporter.js
index 17128c9bd..4aa35ee01 100644
--- a/packages/react-dev-utils/FileSizeReporter.js
+++ b/packages/react-dev-utils/FileSizeReporter.js
@@ -25,21 +25,29 @@ function printFileSizesAfterBuild(
 ) {
   var root = previousSizeMap.root;
   var sizes = previousSizeMap.sizes;
-  var assets = webpackStats
-    .toJson()
-    .assets.filter(asset => /\.(js|css)$/.test(asset.name))
-    .map(asset => {
-      var fileContents = fs.readFileSync(path.join(root, asset.name));
-      var size = gzipSize(fileContents);
-      var previousSize = sizes[removeFileNameHash(root, asset.name)];
-      var difference = getDifferenceLabel(size, previousSize);
-      return {
-        folder: path.join(path.basename(buildFolder), path.dirname(asset.name)),
-        name: path.basename(asset.name),
-        size: size,
-        sizeLabel: filesize(size) + (difference ? ' (' + difference + ')' : ''),
-      };
-    });
+  var assets = (webpackStats.stats || [webpackStats])
+    .map(stats =>
+      stats
+        .toJson()
+        .assets.filter(asset => /\.(js|css)$/.test(asset.name))
+        .map(asset => {
+          var fileContents = fs.readFileSync(path.join(root, asset.name));
+          var size = gzipSize(fileContents);
+          var previousSize = sizes[removeFileNameHash(root, asset.name)];
+          var difference = getDifferenceLabel(size, previousSize);
+          return {
+            folder: path.join(
+              path.basename(buildFolder),
+              path.dirname(asset.name)
+            ),
+            name: path.basename(asset.name),
+            size: size,
+            sizeLabel:
+              filesize(size) + (difference ? ' (' + difference + ')' : '')
+          };
+        })
+    )
+    .reduce((single, all) => all.concat(single), []);
   assets.sort((a, b) => b.size - a.size);
   var longestSizeLabelLength = Math.max.apply(
     null,
diff --git a/packages/react-dev-utils/__tests__/.eslintrc b/packages/react-dev-utils/__tests__/.eslintrc
new file mode 100644
index 000000000..55f121d15
--- /dev/null
+++ b/packages/react-dev-utils/__tests__/.eslintrc
@@ -0,0 +1,5 @@
+{
+  "env": {
+    "jest": true
+  }
+}
diff --git a/packages/react-dev-utils/__tests__/ignoredFiles.test.js b/packages/react-dev-utils/__tests__/ignoredFiles.test.js
new file mode 100644
index 000000000..6feed9797
--- /dev/null
+++ b/packages/react-dev-utils/__tests__/ignoredFiles.test.js
@@ -0,0 +1,55 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+'use strict';
+
+const ignoredFiles = require('../ignoredFiles');
+
+describe('ignore watch files regex', () => {
+  it('normal file', () => {
+    const appSrc = '/root/src/';
+    const isIgnored = ignoredFiles(appSrc).test('/foo');
+    const isIgnoredInSrc = ignoredFiles(appSrc).test('/root/src/foo');
+
+    expect(isIgnored).toBe(false);
+    expect(isIgnoredInSrc).toBe(false);
+  });
+
+  it('node modules', () => {
+    const appSrc = '/root/src/';
+    const isIgnored = ignoredFiles(appSrc).test('/root/node_modules/foo');
+
+    expect(isIgnored).toBe(true);
+  });
+
+  it('node modules inside source directory', () => {
+    const appSrc = '/root/src/';
+    const isIgnored = ignoredFiles(appSrc).test('/root/src/node_modules/foo');
+    const isIgnoredMoreThanOneLevel = ignoredFiles(appSrc).test(
+      '/root/src/bar/node_modules/foo'
+    );
+
+    expect(isIgnored).toBe(false);
+    expect(isIgnoredMoreThanOneLevel).toBe(false);
+  });
+
+  it('path contains source directory', () => {
+    const appSrc = '/root/src/';
+    const isIgnored = ignoredFiles(appSrc).test(
+      '/bar/root/src/node_modules/foo'
+    );
+
+    expect(isIgnored).toBe(true);
+  });
+
+  it('path starts with source directory', () => {
+    const appSrc = '/root/src/';
+    const isIgnored = ignoredFiles(appSrc).test('/root/src2/node_modules/foo');
+
+    expect(isIgnored).toBe(true);
+  });
+});
diff --git a/packages/react-dev-utils/clearConsole.js b/packages/react-dev-utils/clearConsole.js
index 6e3b3c9ce..cb02af892 100644
--- a/packages/react-dev-utils/clearConsole.js
+++ b/packages/react-dev-utils/clearConsole.js
@@ -8,9 +8,7 @@
 'use strict';
 
 function clearConsole() {
-  process.stdout.write(
-    process.platform === 'win32' ? '\x1Bc' : '\x1B[2J\x1B[3J\x1B[H'
-  );
+  process.stdout.write(process.platform === 'win32' ? '\x1B[2J\x1B[0f' : '\x1B[2J\x1B[3J\x1B[H');
 }
 
 module.exports = clearConsole;
diff --git a/packages/react-dev-utils/errorOverlayMiddleware.js b/packages/react-dev-utils/errorOverlayMiddleware.js
index b756b0ef6..873b19947 100644
--- a/packages/react-dev-utils/errorOverlayMiddleware.js
+++ b/packages/react-dev-utils/errorOverlayMiddleware.js
@@ -12,7 +12,9 @@ const launchEditorEndpoint = require('./launchEditorEndpoint');
 module.exports = function createLaunchEditorMiddleware() {
   return function launchEditorMiddleware(req, res, next) {
     if (req.url.startsWith(launchEditorEndpoint)) {
-      launchEditor(req.query.fileName, req.query.lineNumber);
+      const lineNumber = parseInt(req.query.lineNumber, 10) || 1;
+      const colNumber = parseInt(req.query.colNumber, 10) || 1;
+      launchEditor(req.query.fileName, lineNumber, colNumber);
       res.end();
     } else {
       next();
diff --git a/packages/react-dev-utils/getProcessForPort.js b/packages/react-dev-utils/getProcessForPort.js
index bcece718b..e37968313 100644
--- a/packages/react-dev-utils/getProcessForPort.js
+++ b/packages/react-dev-utils/getProcessForPort.js
@@ -58,7 +58,7 @@ function getProcessCommand(processId, processDirectory) {
 
 function getDirectoryOfProcessById(processId) {
   return execSync(
-    'lsof -p ' + processId + ' | awk \'$4=="cwd" {print $9}\'',
+    'lsof -p ' + processId + ' | awk \'$4=="cwd" {for (i=9; i<=NF; i++) printf "%s ", $i}\'',
     execOptions
   ).trim();
 }
diff --git a/packages/react-dev-utils/ignoredFiles.js b/packages/react-dev-utils/ignoredFiles.js
new file mode 100644
index 000000000..73a6e8bc5
--- /dev/null
+++ b/packages/react-dev-utils/ignoredFiles.js
@@ -0,0 +1,20 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+'use strict';
+
+const path = require('path');
+const escape = require('escape-string-regexp');
+
+module.exports = function ignoredFiles(appSrc) {
+  return new RegExp(
+    `^(?!${escape(
+      path.normalize(appSrc + '/').replace(/[\\]+/g, '/')
+    )}).+/node_modules/`,
+    'g'
+  );
+};
diff --git a/packages/react-dev-utils/package.json b/packages/react-dev-utils/package.json
index db7114a26..18f37c971 100644
--- a/packages/react-dev-utils/package.json
+++ b/packages/react-dev-utils/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-dev-utils",
-  "version": "4.2.1",
+  "version": "5.0.0",
   "description": "Webpack utilities used by Create React App",
   "repository": "facebookincubator/create-react-app",
   "license": "MIT",
@@ -21,6 +21,7 @@
     "printBuildError.js",
     "formatWebpackMessages.js",
     "getProcessForPort.js",
+    "ignoredFiles.js",
     "inquirer.js",
     "InterpolateHtmlPlugin.js",
     "launchEditor.js",
@@ -39,19 +40,25 @@
     "babel-code-frame": "6.26.0",
     "chalk": "1.1.3",
     "cross-spawn": "5.1.0",
-    "detect-port-alt": "1.1.3",
+    "detect-port-alt": "1.1.5",
     "escape-string-regexp": "1.0.5",
     "filesize": "3.5.11",
     "global-modules": "1.0.0",
     "gzip-size": "3.0.0",
     "inquirer": "3.3.0",
     "is-root": "1.0.0",
-    "opn": "5.1.0",
-    "react-error-overlay": "^3.0.0",
+    "opn": "5.2.0",
+    "react-error-overlay": "^4.0.0",
     "recursive-readdir": "2.2.1",
     "shell-quote": "1.6.1",
     "sockjs-client": "1.1.4",
     "strip-ansi": "3.0.1",
     "text-table": "0.2.0"
+  },
+  "devDependencies": {
+    "jest": "20.0.4"
+  },
+  "scripts": {
+    "test": "jest"
   }
 }
diff --git a/packages/react-dev-utils/webpackHotDevClient.js b/packages/react-dev-utils/webpackHotDevClient.js
index 296e38046..cbbc80029 100644
--- a/packages/react-dev-utils/webpackHotDevClient.js
+++ b/packages/react-dev-utils/webpackHotDevClient.js
@@ -30,7 +30,9 @@ ErrorOverlay.setEditorHandler(function editorHandler(errorLocation) {
       '?fileName=' +
       window.encodeURIComponent(errorLocation.fileName) +
       '&lineNumber=' +
-      window.encodeURIComponent(errorLocation.lineNumber || 1)
+      window.encodeURIComponent(errorLocation.lineNumber || 1) +
+      '&colNumber=' +
+      window.encodeURIComponent(errorLocation.colNumber || 1)
   );
 });
 
diff --git a/packages/react-error-overlay/.flowconfig b/packages/react-error-overlay/.flowconfig
index 8d7de784e..c976167c2 100644
--- a/packages/react-error-overlay/.flowconfig
+++ b/packages/react-error-overlay/.flowconfig
@@ -1,9 +1,15 @@
-[ignore]
-.*/node_modules/eslint-plugin-jsx-a11y/.*
-
 [include]
-src/**/*.js
+<PROJECT_ROOT>/src/**/*.js
+
+[ignore]
+.*/node_modules/.*
+.*/.git/.*
+.*/__test__/.*
+.*/fixtures/.*
 
 [libs]
+flow/
 
 [options]
+module.file_ext=.js
+sharedmemory.hash_table_pow=19
diff --git a/packages/react-error-overlay/flow/env.js b/packages/react-error-overlay/flow/env.js
new file mode 100644
index 000000000..12b151f5e
--- /dev/null
+++ b/packages/react-error-overlay/flow/env.js
@@ -0,0 +1,19 @@
+declare module 'anser' {
+  declare module.exports: any;
+}
+
+declare module 'babel-code-frame' {
+  declare module.exports: any;
+}
+
+declare module 'html-entities' {
+  declare module.exports: any;
+}
+
+declare module 'settle-promise' {
+  declare module.exports: any;
+}
+
+declare module 'source-map' {
+  declare module.exports: any;
+}
diff --git a/packages/react-error-overlay/package.json b/packages/react-error-overlay/package.json
index d4e528ea6..87099dd5e 100644
--- a/packages/react-error-overlay/package.json
+++ b/packages/react-error-overlay/package.json
@@ -1,12 +1,12 @@
 {
   "name": "react-error-overlay",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "description": "An overlay for displaying stack frames.",
   "main": "lib/index.js",
   "scripts": {
     "prepublishOnly": "npm run build:prod && npm test",
     "start": "cross-env NODE_ENV=development node build.js --watch",
-    "test": "flow && cross-env NODE_ENV=test jest",
+    "test": "cross-env NODE_ENV=test jest",
     "build": "cross-env NODE_ENV=development node build.js",
     "build:prod": "cross-env NODE_ENV=production node build.js"
   },
@@ -35,18 +35,18 @@
     "babel-core": "^6.26.0",
     "babel-eslint": "7.2.3",
     "babel-loader": "^7.1.2",
-    "babel-preset-react-app": "^3.1.0",
+    "babel-preset-react-app": "^3.1.1",
     "babel-runtime": "6.26.0",
     "chalk": "^2.1.0",
     "chokidar": "^1.7.0",
     "cross-env": "5.0.5",
     "eslint": "4.4.1",
-    "eslint-config-react-app": "^2.0.1",
+    "eslint-config-react-app": "^2.1.0",
     "eslint-plugin-flowtype": "2.35.0",
     "eslint-plugin-import": "2.7.0",
     "eslint-plugin-jsx-a11y": "5.1.1",
     "eslint-plugin-react": "7.1.0",
-    "flow-bin": "^0.54.0",
+    "flow-bin": "^0.63.1",
     "html-entities": "1.2.1",
     "jest": "20.0.4",
     "jest-fetch-mock": "1.2.1",
diff --git a/packages/react-error-overlay/src/utils/parseCompileError.js b/packages/react-error-overlay/src/utils/parseCompileError.js
index 2c9b6e60e..e87c45622 100644
--- a/packages/react-error-overlay/src/utils/parseCompileError.js
+++ b/packages/react-error-overlay/src/utils/parseCompileError.js
@@ -4,6 +4,7 @@ import Anser from 'anser';
 export type ErrorLocation = {|
   fileName: string,
   lineNumber: number,
+  colNumber?: number,
 |};
 
 const filePathRegex = /^\.(\/[^/\n ]+)+\.[^/\n ]+$/;
@@ -25,6 +26,7 @@ function parseCompileError(message: string): ?ErrorLocation {
   const lines: Array<string> = message.split('\n');
   let fileName: string = '';
   let lineNumber: number = 0;
+  let colNumber: number = 0;
 
   for (let i = 0; i < lines.length; i++) {
     const line: string = Anser.ansiToText(lines[i]).trim();
@@ -41,6 +43,8 @@ function parseCompileError(message: string): ?ErrorLocation {
       const match: ?Array<string> = line.match(lineNumberRegexes[k]);
       if (match) {
         lineNumber = parseInt(match[1], 10);
+        // colNumber starts with 0 and hence add 1
+        colNumber = parseInt(match[2], 10) + 1 || 1;
         break;
       }
       k++;
@@ -51,7 +55,7 @@ function parseCompileError(message: string): ?ErrorLocation {
     }
   }
 
-  return fileName && lineNumber ? { fileName, lineNumber } : null;
+  return fileName && lineNumber ? { fileName, lineNumber, colNumber } : null;
 }
 
 export default parseCompileError;
diff --git a/packages/react-scripts/config/env.js b/packages/react-scripts/config/env.js
index cf6467554..7793fadf0 100644
--- a/packages/react-scripts/config/env.js
+++ b/packages/react-scripts/config/env.js
@@ -35,13 +35,16 @@ var dotenvFiles = [
 
 // Load environment variables from .env* files. Suppress warnings using silent
 // if this file is missing. dotenv will never modify any environment variables
-// that have already been set.
+// that have already been set.  Variable expansion is supported in .env files.
 // https://github.com/motdotla/dotenv
+// https://github.com/motdotla/dotenv-expand
 dotenvFiles.forEach(dotenvFile => {
   if (fs.existsSync(dotenvFile)) {
-    require('dotenv').config({
-      path: dotenvFile,
-    });
+    require('dotenv-expand')(
+      require('dotenv').config({
+        path: dotenvFile,
+      })
+    );
   }
 });
 
diff --git a/packages/react-scripts/config/jest/cssTransform.js b/packages/react-scripts/config/jest/cssTransform.js
index 99a8cb269..59053068f 100644
--- a/packages/react-scripts/config/jest/cssTransform.js
+++ b/packages/react-scripts/config/jest/cssTransform.js
@@ -9,7 +9,7 @@
 'use strict';
 
 // This is a custom Jest transformer turning style imports into empty objects.
-// http://facebook.github.io/jest/docs/tutorial-webpack.html
+// http://facebook.github.io/jest/docs/en/webpack.html
 
 module.exports = {
   process() {
diff --git a/packages/react-scripts/config/jest/fileTransform.js b/packages/react-scripts/config/jest/fileTransform.js
index 8f9b843ab..38910e18b 100644
--- a/packages/react-scripts/config/jest/fileTransform.js
+++ b/packages/react-scripts/config/jest/fileTransform.js
@@ -11,7 +11,7 @@
 const path = require('path');
 
 // This is a custom Jest transformer turning file imports into filenames.
-// http://facebook.github.io/jest/docs/tutorial-webpack.html
+// http://facebook.github.io/jest/docs/en/webpack.html
 
 module.exports = {
   process(src, filename) {
diff --git a/packages/react-scripts/config/webpack.config.dev.js b/packages/react-scripts/config/webpack.config.dev.js
index ed7d6400d..924e3e4f0 100644
--- a/packages/react-scripts/config/webpack.config.dev.js
+++ b/packages/react-scripts/config/webpack.config.dev.js
@@ -227,10 +227,10 @@ module.exports = {
           // that fall through the other loaders.
           {
             // Exclude `js` files to keep "css" loader working as it injects
-            // it's runtime that would otherwise processed through "file" loader.
+            // its runtime that would otherwise processed through "file" loader.
             // Also exclude `html` and `json` extensions so they get processed
             // by webpacks internal loaders.
-            exclude: [/\.js$/, /\.html$/, /\.json$/],
+            exclude: [/\.(js|jsx|mjs)$/, /\.html$/, /\.json$/],
             loader: require.resolve('file-loader'),
             options: {
               name: 'static/media/[name].[hash:8].[ext]',
diff --git a/packages/react-scripts/config/webpack.config.prod.js b/packages/react-scripts/config/webpack.config.prod.js
index 743c2e417..4674e9ae0 100644
--- a/packages/react-scripts/config/webpack.config.prod.js
+++ b/packages/react-scripts/config/webpack.config.prod.js
@@ -256,7 +256,7 @@ module.exports = {
             // it's runtime that would otherwise processed through "file" loader.
             // Also exclude `html` and `json` extensions so they get processed
             // by webpacks internal loaders.
-            exclude: [/\.js$/, /\.html$/, /\.json$/],
+            exclude: [/\.(js|jsx|mjs)$/, /\.html$/, /\.json$/],
             options: {
               name: 'static/media/[name].[hash:8].[ext]',
             },
diff --git a/packages/react-scripts/config/webpackDevServer.config.js b/packages/react-scripts/config/webpackDevServer.config.js
index afbcf1569..c5a24d839 100644
--- a/packages/react-scripts/config/webpackDevServer.config.js
+++ b/packages/react-scripts/config/webpackDevServer.config.js
@@ -10,7 +10,7 @@
 
 const errorOverlayMiddleware = require('react-dev-utils/errorOverlayMiddleware');
 const noopServiceWorkerMiddleware = require('react-dev-utils/noopServiceWorkerMiddleware');
-const path = require('path');
+const ignoredFiles = require('react-dev-utils/ignoredFiles');
 const config = require('./webpack.config.dev');
 const paths = require('./paths');
 
@@ -76,12 +76,7 @@ module.exports = function(proxy, allowedHost) {
     // src/node_modules is not ignored to support absolute imports
     // https://github.com/facebookincubator/create-react-app/issues/1065
     watchOptions: {
-      ignored: new RegExp(
-        `^(?!${path
-          .normalize(paths.appSrc + '/')
-          .replace(/[\\]+/g, '\\\\')}).+[\\\\/]node_modules[\\\\/]`,
-        'g'
-      ),
+      ignored: ignoredFiles(paths.appSrc),
     },
     // Enable HTTPS if the HTTPS environment variable is set to 'true'
     https: protocol === 'https',
diff --git a/packages/react-scripts/fixtures/kitchensink/.env b/packages/react-scripts/fixtures/kitchensink/.env
index 3e2f7b14a..9f7acc602 100644
--- a/packages/react-scripts/fixtures/kitchensink/.env
+++ b/packages/react-scripts/fixtures/kitchensink/.env
@@ -1,3 +1,7 @@
 REACT_APP_X = x-from-original-env
 REACT_APP_ORIGINAL_1 = from-original-env-1
 REACT_APP_ORIGINAL_2 = from-original-env-2
+REACT_APP_BASIC = basic
+REACT_APP_BASIC_EXPAND = ${REACT_APP_BASIC}
+REACT_APP_BASIC_EXPAND_SIMPLE = $REACT_APP_BASIC
+REACT_APP_EXPAND_EXISTING = $REACT_APP_SHELL_ENV_MESSAGE
diff --git a/packages/react-scripts/fixtures/kitchensink/integration/env.test.js b/packages/react-scripts/fixtures/kitchensink/integration/env.test.js
index 28ec49188..1c509db42 100644
--- a/packages/react-scripts/fixtures/kitchensink/integration/env.test.js
+++ b/packages/react-scripts/fixtures/kitchensink/integration/env.test.js
@@ -66,5 +66,22 @@ describe('Integration', () => {
         doc.getElementById('feature-shell-env-variables').textContent
       ).to.equal('fromtheshell.');
     });
+
+    it('expand .env variables', async () => {
+      const doc = await initDOM('expand-env-variables');
+
+      expect(doc.getElementById('feature-expand-env-1').textContent).to.equal(
+        'basic'
+      );
+      expect(doc.getElementById('feature-expand-env-2').textContent).to.equal(
+        'basic'
+      );
+      expect(doc.getElementById('feature-expand-env-3').textContent).to.equal(
+        'basic'
+      );
+      expect(
+        doc.getElementById('feature-expand-env-existing').textContent
+      ).to.equal('fromtheshell');
+    });
   });
 });
diff --git a/packages/react-scripts/fixtures/kitchensink/src/App.js b/packages/react-scripts/fixtures/kitchensink/src/App.js
index b5f741a34..ecec924ff 100644
--- a/packages/react-scripts/fixtures/kitchensink/src/App.js
+++ b/packages/react-scripts/fixtures/kitchensink/src/App.js
@@ -161,6 +161,11 @@ class App extends Component {
           './features/webpack/UnknownExtInclusion'
         ).then(f => this.setFeature(f.default));
         break;
+      case 'expand-env-variables':
+        import('./features/env/ExpandEnvVariables').then(f =>
+          this.setFeature(f.default)
+        );
+        break;
       default:
         throw new Error(`Missing feature "${feature}"`);
     }
diff --git a/packages/react-scripts/fixtures/kitchensink/src/features/env/ExpandEnvVariables.js b/packages/react-scripts/fixtures/kitchensink/src/features/env/ExpandEnvVariables.js
new file mode 100644
index 000000000..58fc00e3a
--- /dev/null
+++ b/packages/react-scripts/fixtures/kitchensink/src/features/env/ExpandEnvVariables.js
@@ -0,0 +1,21 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+
+export default () => (
+  <span>
+    <span id="feature-expand-env-1">{process.env.REACT_APP_BASIC}</span>
+    <span id="feature-expand-env-2">{process.env.REACT_APP_BASIC_EXPAND}</span>
+    <span id="feature-expand-env-3">
+      {process.env.REACT_APP_BASIC_EXPAND_SIMPLE}
+    </span>
+    <span id="feature-expand-env-existing">
+      {process.env.REACT_APP_EXPAND_EXISTING}
+    </span>
+  </span>
+);
diff --git a/packages/react-scripts/fixtures/kitchensink/src/features/env/ExpandEnvVariables.test.js b/packages/react-scripts/fixtures/kitchensink/src/features/env/ExpandEnvVariables.test.js
new file mode 100644
index 000000000..4e4200abe
--- /dev/null
+++ b/packages/react-scripts/fixtures/kitchensink/src/features/env/ExpandEnvVariables.test.js
@@ -0,0 +1,17 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+import ReactDOM from 'react-dom';
+import ExpandEnvVariables from './ExpandEnvVariables';
+
+describe('expand .env variables', () => {
+  it('renders without crashing', () => {
+    const div = document.createElement('div');
+    ReactDOM.render(<ExpandEnvVariables />, div);
+  });
+});
diff --git a/packages/react-scripts/fixtures/kitchensink/src/features/syntax/ObjectDestructuring.js b/packages/react-scripts/fixtures/kitchensink/src/features/syntax/ObjectDestructuring.js
index 24f202261..14b06f7a4 100644
--- a/packages/react-scripts/fixtures/kitchensink/src/features/syntax/ObjectDestructuring.js
+++ b/packages/react-scripts/fixtures/kitchensink/src/features/syntax/ObjectDestructuring.js
@@ -40,12 +40,10 @@ export default class extends Component {
     return (
       <div id="feature-object-destructuring">
         {this.state.users.map(user => {
-          const { id, name } = user;
-          return (
-            <div key={id}>
-              {name}
-            </div>
-          );
+          const { id, ...rest } = user;
+          // eslint-disable-next-line no-unused-vars
+          const [{ name, ...innerRest }] = [{ ...rest }];
+          return <div key={id}>{name}</div>;
         })}
       </div>
     );
diff --git a/packages/react-scripts/package.json b/packages/react-scripts/package.json
index 16ba41caa..538422439 100644
--- a/packages/react-scripts/package.json
+++ b/packages/react-scripts/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-scripts-ts",
-  "version": "2.14.0",
+  "version": "2.14.1-0",
   "description": "Configuration and scripts for Create React App.",
   "repository": "wmonk/create-react-app",
   "license": "BSD-3-Clause",
@@ -29,6 +29,7 @@
     "chalk": "1.1.3",
     "css-loader": "0.28.7",
     "dotenv": "4.0.0",
+    "dotenv-expand": "4.2.0",
     "extract-text-webpack-plugin": "3.0.2",
     "file-loader": "0.11.2",
     "fork-ts-checker-webpack-plugin": "^0.2.8",
@@ -40,8 +41,8 @@
     "postcss-loader": "2.0.8",
     "promise": "8.0.1",
     "raf": "3.4.0",
-    "react-dev-utils": "4.2.1",
     "source-map-loader": "^0.2.1",
+    "react-dev-utils": "^5.0.0",
     "style-loader": "0.19.0",
     "sw-precache-webpack-plugin": "0.11.4",
     "ts-jest": "22.0.1",
@@ -65,6 +66,6 @@
     "typescript": "2.x"
   },
   "optionalDependencies": {
-    "fsevents": "1.1.2"
+    "fsevents": "^1.1.3"
   }
 }
diff --git a/packages/react-scripts/scripts/eject.js b/packages/react-scripts/scripts/eject.js
index 1721676a3..59f385a7f 100644
--- a/packages/react-scripts/scripts/eject.js
+++ b/packages/react-scripts/scripts/eject.js
@@ -54,11 +54,17 @@ inquirer
     if (gitStatus) {
       console.error(
         chalk.red(
-          `This git repository has untracked files or uncommitted changes:\n\n` +
-            gitStatus.split('\n').map(line => '  ' + line) +
-            '\n\n' +
+          'This git repository has untracked files or uncommitted changes:'
+        ) +
+          '\n\n' +
+          gitStatus
+            .split('\n')
+            .map(line => line.match(/ .*/g)[0].trim())
+            .join('\n') +
+          '\n\n' +
+          chalk.red(
             'Remove untracked files, stash or commit any changes, and try again.'
-        )
+          )
       );
       process.exit(1);
     }
diff --git a/packages/react-scripts/scripts/start.js b/packages/react-scripts/scripts/start.js
index 8df052d3b..3ff1b91f4 100644
--- a/packages/react-scripts/scripts/start.js
+++ b/packages/react-scripts/scripts/start.js
@@ -51,8 +51,23 @@ if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
 const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000;
 const HOST = process.env.HOST || '0.0.0.0';
 
+if (process.env.HOST) {
+  console.log(
+    chalk.cyan(
+      `Attempting to bind to HOST environment variable: ${chalk.yellow(
+        chalk.bold(process.env.HOST)
+      )}`
+    )
+  );
+  console.log(
+    `If this was unintentional, check that you haven't mistakenly set it in your shell.`
+  );
+  console.log(`Learn more here: ${chalk.yellow('http://bit.ly/2mwWSwH')}`);
+  console.log();
+}
+
 // We attempt to use the default port but if it is busy, we offer the user to
-// run on a different port. `detect()` Promise resolves to the next free port.
+// run on a different port. `choosePort()` Promise resolves to the next free port.
 choosePort(HOST, DEFAULT_PORT)
   .then(port => {
     if (port == null) {
diff --git a/packages/react-scripts/template/README.md b/packages/react-scripts/template/README.md
index f17df9b06..8d0edf675 100644
--- a/packages/react-scripts/template/README.md
+++ b/packages/react-scripts/template/README.md
@@ -13,6 +13,7 @@ You can find the most recent version of this guide [here](https://github.com/fac
   - [npm test](#npm-test)
   - [npm run build](#npm-run-build)
   - [npm run eject](#npm-run-eject)
+- [Supported Browsers](#supported-browsers)
 - [Supported Language Features and Polyfills](#supported-language-features-and-polyfills)
 - [Syntax Highlighting in the Editor](#syntax-highlighting-in-the-editor)
 - [Displaying Lint Output in the Editor](#displaying-lint-output-in-the-editor)
@@ -34,11 +35,13 @@ You can find the most recent version of this guide [here](https://github.com/fac
 - [Adding Bootstrap](#adding-bootstrap)
   - [Using a Custom Theme](#using-a-custom-theme)
 - [Adding Flow](#adding-flow)
+- [Adding a Router](#adding-a-router)
 - [Adding Custom Environment Variables](#adding-custom-environment-variables)
   - [Referencing Environment Variables in the HTML](#referencing-environment-variables-in-the-html)
   - [Adding Temporary Environment Variables In Your Shell](#adding-temporary-environment-variables-in-your-shell)
   - [Adding Development Environment Variables In `.env`](#adding-development-environment-variables-in-env)
 - [Can I Use Decorators?](#can-i-use-decorators)
+- [Fetching Data with AJAX Requests](#fetching-data-with-ajax-requests)
 - [Integrating with an API Backend](#integrating-with-an-api-backend)
   - [Node](#node)
   - [Ruby on Rails](#ruby-on-rails)
@@ -64,9 +67,13 @@ You can find the most recent version of this guide [here](https://github.com/fac
   - [Disabling jsdom](#disabling-jsdom)
   - [Snapshot Testing](#snapshot-testing)
   - [Editor Integration](#editor-integration)
+- [Debugging Tests](#debugging-tests)
+  - [Debugging Tests in Chrome](#debugging-tests-in-chrome)
+  - [Debugging Tests in Visual Studio Code](#debugging-tests-in-visual-studio-code)
 - [Developing Components in Isolation](#developing-components-in-isolation)
   - [Getting Started with Storybook](#getting-started-with-storybook)
   - [Getting Started with Styleguidist](#getting-started-with-styleguidist)
+- [Publishing Components to npm](#publishing-components-to-npm)
 - [Making a Progressive Web App](#making-a-progressive-web-app)
   - [Opting Out of Caching](#opting-out-of-caching)
   - [Offline-First Considerations](#offline-first-considerations)
@@ -93,6 +100,7 @@ You can find the most recent version of this guide [here](https://github.com/fac
   - [`npm run build` fails on Heroku](#npm-run-build-fails-on-heroku)
   - [`npm run build` fails to minify](#npm-run-build-fails-to-minify)
   - [Moment.js locales are missing](#momentjs-locales-are-missing)
+- [Alternatives to Ejecting](#alternatives-to-ejecting)
 - [Something Missing?](#something-missing)
 
 ## Updating to New Releases
@@ -190,6 +198,12 @@ Instead, it will copy all the configuration files and the transitive dependencie
 
 You don’t have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
 
+## Supported Browsers
+
+By default, the generated project uses the latest version of React.
+
+You can refer [to the React documentation](https://reactjs.org/docs/react-dom.html#browser-support) for more information about supported browsers.
+
 ## Supported Language Features and Polyfills
 
 This project supports a superset of the latest JavaScript standard.<br>
@@ -214,6 +228,8 @@ Note that **the project only includes a few ES6 [polyfills](https://en.wikipedia
 
 If you use any other ES6+ features that need **runtime support** (such as `Array.from()` or `Symbol`), make sure you are including the appropriate polyfills manually, or that the browsers you are targeting already support them.
 
+Also note that using some newer syntax features like `for...of` or `[...nonArrayValue]` causes Babel to emit code that depends on ES6 runtime features and might not work without a polyfill. When in doubt, use [Babel REPL](https://babeljs.io/repl/) to see what any specific syntax compiles down to.
+
 ## Syntax Highlighting in the Editor
 
 To configure the syntax highlighting in your favorite text editor, head to the [relevant Babel documentation page](https://babeljs.io/docs/editors) and follow the instructions. Some of the most popular editors are covered.
@@ -331,9 +347,9 @@ Next we add a 'lint-staged' field to the `package.json`, for example:
   "scripts": {
 ```
 
-Now, whenever you make a commit, Prettier will format the changed files automatically. You can also run `./node_modules/.bin/prettier --single-quote --write "src/**/*.{js,jsx}"` to format your entire project for the first time.
+Now, whenever you make a commit, Prettier will format the changed files automatically. You can also run `./node_modules/.bin/prettier --single-quote --write "src/**/*.{js,jsx,json,css}"` to format your entire project for the first time.
 
-Next you might want to integrate Prettier in your favorite editor. Read the section on [Editor Integration](https://github.com/prettier/prettier#editor-integration) on the Prettier GitHub page.
+Next you might want to integrate Prettier in your favorite editor. Read the section on [Editor Integration](https://prettier.io/docs/en/editors.html) on the Prettier GitHub page.
 
 ## Changing the Page `<title>`
 
@@ -461,6 +477,8 @@ You can also use it with `async` / `await` syntax if you prefer it.
 
 If you are using React Router check out [this tutorial](http://serverless-stack.com/chapters/code-splitting-in-create-react-app.html) on how to use code splitting with it. You can find the companion GitHub repository [here](https://github.com/AnomalyInnovations/serverless-stack-demo-client/tree/code-splitting-in-create-react-app).
 
+Also check out the [Code Splitting](https://reactjs.org/docs/code-splitting.html) section in React documentation.
+
 ## Adding a Stylesheet
 
 This project setup uses [Webpack](https://webpack.js.org/) for handling all assets. Webpack offers a custom way of “extending” the concept of `import` beyond JavaScript. To express that a JavaScript file depends on a CSS file, you need to **import the CSS from the JavaScript file**:
@@ -818,6 +836,26 @@ In the future we plan to integrate it into Create React App even more closely.
 
 To learn more about Flow, check out [its documentation](https://flowtype.org/).
 
+## Adding a Router
+
+Create React App doesn't prescribe a specific routing solution, but [React Router](https://reacttraining.com/react-router/) is the most popular one.
+
+To add it, run:
+
+```sh
+npm install --save react-router-dom
+```
+
+Alternatively you may use `yarn`:
+
+```sh
+yarn add react-router-dom
+```
+
+To try it, delete all the code in `src/App.js` and replace it with any of the examples on its website. The [Basic Example](https://reacttraining.com/react-router/web/example/basic) is a good place to get started.
+
+Note that [you may need to configure your production server to support client-side routing](#serving-apps-with-client-side-routing) before deploying your app.
+
 ## Adding Custom Environment Variables
 
 >Note: this feature is available with `react-scripts@0.2.3` and higher.
@@ -904,10 +942,16 @@ life of the shell session.
 #### Windows (cmd.exe)
 
 ```cmd
-set REACT_APP_SECRET_CODE=abcdef&&npm start
+set "REACT_APP_SECRET_CODE=abcdef" && npm start
 ```
 
-(Note: the lack of whitespace is intentional.)
+(Note: Quotes around the variable assignment are required to avoid a trailing whitespace.)
+
+#### Windows (Powershell)
+
+```Powershell
+($env:REACT_APP_SECRET_CODE = "abcdef") -and (npm start)
+```
 
 #### Linux, macOS (Bash)
 
@@ -924,6 +968,7 @@ To define permanent environment variables, create a file called `.env` in the ro
 ```
 REACT_APP_SECRET_CODE=abcdef
 ```
+>Note: You must create custom environment variables beginning with `REACT_APP_`. Any other variables except `NODE_ENV` will be ignored to avoid [accidentally exposing a private key on the machine that could have the same name](https://github.com/facebookincubator/create-react-app/issues/865#issuecomment-252199527). Changing any environment variables will require you to restart the development server if it is running.
 
 `.env` files **should be** checked into source control (with the exclusion of `.env*.local`).
 
@@ -948,6 +993,28 @@ Please refer to the [dotenv documentation](https://github.com/motdotla/dotenv) f
 >Note: If you are defining environment variables for development, your CI and/or hosting platform will most likely need
 these defined as well. Consult their documentation how to do this. For example, see the documentation for [Travis CI](https://docs.travis-ci.com/user/environment-variables/) or [Heroku](https://devcenter.heroku.com/articles/config-vars).
 
+#### Expanding Environment Variables In `.env`
+
+>Note: this feature is available with `react-scripts@1.1.0` and higher.
+
+Expand variables already on your machine for use in your `.env` file (using [dotenv-expand](https://github.com/motdotla/dotenv-expand)).
+
+For example, to get the environment variable `npm_package_version`:
+
+```
+REACT_APP_VERSION=$npm_package_version
+# also works:
+# REACT_APP_VERSION=${npm_package_version}
+```
+
+Or expand variables local to the current `.env` file:
+
+```
+DOMAIN=www.example.com
+REACT_APP_FOO=$DOMAIN/foo
+REACT_APP_BAR=$DOMAIN/bar
+```
+
 ## Can I Use Decorators?
 
 Many popular libraries use [decorators](https://medium.com/google-developers/exploring-es7-decorators-76ecb65fb841) in their documentation.<br>
@@ -965,6 +1032,16 @@ Please refer to these two threads for reference:
 
 Create React App will add decorator support when the specification advances to a stable stage.
 
+## Fetching Data with AJAX Requests
+
+React doesn't prescribe a specific approach to data fetching, but people commonly use either a library like [axios](https://github.com/axios/axios) or the [`fetch()` API](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API) provided by the browser. Conveniently, Create React App includes a polyfill for `fetch()` so you can use it without worrying about the browser support.
+
+The global `fetch` function allows to easily makes AJAX requests. It takes in a URL as an input and returns a `Promise` that resolves to a `Response` object. You can find more information about `fetch` [here](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch).
+
+This project also includes a [Promise polyfill](https://github.com/then/promise) which provides a full implementation of Promises/A+. A Promise represents the eventual result of an asynchronous operation, you can find more information about Promises [here](https://www.promisejs.org/) and [here](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise). Both axios and `fetch()` use Promises under the hood. You can also use the [`async / await`](https://davidwalsh.name/async-await) syntax to reduce the callback nesting.
+
+You can learn more about making AJAX requests from React components in [the FAQ entry on the React website](https://reactjs.org/docs/faq-ajax.html).
+
 ## Integrating with an API Backend
 
 These tutorials will help you to integrate your app with an API backend running on another port,
@@ -1145,6 +1222,12 @@ To do this, set the `HTTPS` environment variable to `true`, then start the dev s
 set HTTPS=true&&npm start
 ```
 
+#### Windows (Powershell)
+
+```Powershell
+($env:HTTPS = $true) -and (npm start)
+```
+
 (Note: the lack of whitespace is intentional.)
 
 #### Linux, macOS (Bash)
@@ -1272,7 +1355,7 @@ it('renders without crashing', () => {
 });
 ```
 
-This test mounts a component and makes sure that it didn’t throw during rendering. Tests like this provide a lot value with very little effort so they are great as a starting point, and this is the test you will find in `src/App.test.tsx`.
+This test mounts a component and makes sure that it didn’t throw during rendering. Tests like this provide a lot of value with very little effort so they are great as a starting point, and this is the test you will find in `src/App.test.tsx`.
 
 When you encounter bugs caused by changing components, you will gain a deeper insight into which parts of them are worth testing in your application. This might be a good time to introduce more specific tests asserting specific expected output or behavior.
 
@@ -1296,7 +1379,9 @@ import * as Adapter from 'enzyme-adapter-react-16';
 Enzyme.configure({ adapter: new Adapter() });
 ```
 
-You can write a smoke test with it too:
+>Note: Keep in mind that if you decide to "eject" before creating `src/setupTests.js`, the resulting `package.json` file won't contain any reference to it. [Read here](#initializing-test-environment) to learn how to add this after ejecting.
+
+Now you can write a smoke test with it:
 
 ```ts
 import * as React from 'react';
@@ -1330,7 +1415,7 @@ it('renders welcome message', () => {
 All Jest matchers are [extensively documented here](http://facebook.github.io/jest/docs/expect.html).<br>
 Nevertheless you can use a third-party assertion library like [Chai](http://chaijs.com/) if you want to, as described below.
 
-Additionally, you might find [jest-enzyme](https://github.com/blainekasten/enzyme-matchers) helpful to simplify your tests with readable matchers. The above `contains` code can be written simpler with jest-enzyme.
+Additionally, you might find [jest-enzyme](https://github.com/blainekasten/enzyme-matchers) helpful to simplify your tests with readable matchers. The above `contains` code can be written more simply with jest-enzyme.
 
 ```js
 expect(wrapper).toContainReact(welcome)
@@ -1385,6 +1470,15 @@ const localStorageMock = {
 global.localStorage = localStorageMock
 ```
 
+>Note: Keep in mind that if you decide to "eject" before creating `src/setupTests.js`, the resulting `package.json` file won't contain any reference to it, so you should manually create the property `setupTestFrameworkScriptFile` in the configuration for Jest, something like the following:
+
+>```js
+>"jest": {
+>   // ...
+>   "setupTestFrameworkScriptFile": "<rootDir>/src/setupTests.js"
+>  }
+>  ```
+
 ### Focusing and Excluding Tests
 
 You can replace `it()` with `xit()` to temporarily exclude a test from being executed.<br>
@@ -1443,6 +1537,16 @@ set CI=true&&npm run build
 
 (Note: the lack of whitespace is intentional.)
 
+##### Windows (Powershell)
+
+```Powershell
+($env:CI = $true) -and (npm test)
+```
+
+```Powershell
+($env:CI = $true) -and (npm run build)
+```
+
 ##### Linux, macOS (Bash)
 
 ```bash
@@ -1504,6 +1608,65 @@ If you use [Visual Studio Code](https://code.visualstudio.com), there is a [Jest
 
 ![VS Code Jest Preview](https://cloud.githubusercontent.com/assets/49038/20795349/a032308a-b7c8-11e6-9b34-7eeac781003f.png)
 
+## Debugging Tests
+
+There are various ways to setup a debugger for your Jest tests. We cover debugging in Chrome and [Visual Studio Code](https://code.visualstudio.com/).
+
+>Note: debugging tests requires Node 8 or higher.
+
+### Debugging Tests in Chrome
+
+Add the following to the `scripts` section in your project's `package.json`
+```json
+"scripts": {
+    "test:debug": "react-scripts --inspect-brk test --runInBand --env=jsdom"
+  }
+```
+Place `debugger;` statements in any test and run:
+```bash
+$ npm run test:debug
+```
+
+This will start running your Jest tests, but pause before executing to allow a debugger to attach to the process.
+
+Open the following in Chrome
+```
+about:inspect
+```
+
+After opening that link, the Chrome Developer Tools will be displayed. Select `inspect` on your process and a breakpoint will be set at the first line of the react script (this is done simply to give you time to open the developer tools and to prevent Jest from executing before you have time to do so). Click the button that looks like a "play" button in the upper right hand side of the screen to continue execution. When Jest executes the test that contains the debugger statement, execution will pause and you can examine the current scope and call stack.
+
+>Note: the --runInBand cli option makes sure Jest runs test in the same process rather than spawning processes for individual tests. Normally Jest parallelizes test runs across processes but it is hard to debug many processes at the same time.
+
+### Debugging Tests in Visual Studio Code
+
+Debugging Jest tests is supported out of the box for [Visual Studio Code](https://code.visualstudio.com).
+
+Use the following [`launch.json`](https://code.visualstudio.com/docs/editor/debugging#_launch-configurations) configuration file:
+```
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Debug CRA Tests",
+      "type": "node",
+      "request": "launch",
+      "runtimeExecutable": "${workspaceRoot}/node_modules/.bin/react-scripts",      
+      "args": [
+        "test",
+        "--runInBand",
+        "--no-cache",
+        "--env=jsdom"
+      ],
+      "cwd": "${workspaceRoot}",
+      "protocol": "inspector",
+      "console": "integratedTerminal",
+      "internalConsoleOptions": "neverOpen"
+    }
+  ]
+}
+```
+
 ## Developing Components in Isolation
 
 Usually, in an app, you have a lot of UI components, and each of them has many different states.
@@ -1584,6 +1747,10 @@ Learn more about React Styleguidist:
 * [GitHub Repo](https://github.com/styleguidist/react-styleguidist)
 * [Documentation](https://react-styleguidist.js.org/docs/getting-started.html)
 
+## Publishing Components to npm
+
+Create React App doesn't provide any built-in functionality to publish a component to npm. If you're ready to extract a component from your project so other people can use it, we recommend moving it to a separate directory outside of your project and then using a tool like [nwb](https://github.com/insin/nwb#react-components-and-libraries) to prepare it for publishing.
+
 ## Making a Progressive Web App
 
 By default, the production build is a fully functional, offline-first
@@ -1725,7 +1892,7 @@ npm run analyze
 
 ## Deployment
 
-`npm run build` creates a `build` directory with a production build of your app. Set up your favourite HTTP server so that a visitor to your site is served `index.html`, and requests to static paths like `/static/js/main.<hash>.js` are served with the contents of the `/static/js/main.<hash>.js` file.
+`npm run build` creates a `build` directory with a production build of your app. Set up your favorite HTTP server so that a visitor to your site is served `index.html`, and requests to static paths like `/static/js/main.<hash>.js` are served with the contents of the `/static/js/main.<hash>.js` file.
 
 ### Static Server
 
@@ -1847,6 +2014,9 @@ See [this](https://medium.com/@to_pe/deploying-create-react-app-on-microsoft-azu
 
 ### Firebase
 
+See [this](https://medium.com/@strid/host-create-react-app-on-azure-986bc40d5bf2#.pycfnafbg) blog post or [this](https://github.com/ulrikaugustsson/azure-appservice-static) repo for a way to use automatic deployment to Azure App Service.
+
+
 Install the Firebase CLI if you haven’t already by running `npm install -g firebase-tools`. Sign up for a [Firebase account](https://console.firebase.google.com/) and create a new project. Run `firebase login` and login with your previous created Firebase account.
 
 Then run the `firebase init` command from your project’s root. You need to choose the **Hosting: Configure and deploy Firebase Hosting sites** and choose the Firebase project you created in the previous step. You will need to agree with `database.rules.json` being created, choose `build` as the public directory, and also agree to **Configure as a single-page app** by replying with `y`.
@@ -1886,6 +2056,18 @@ Then run the `firebase init` command from your project’s root. You need to cho
     ✔  Firebase initialization complete!
 ```
 
+IMPORTANT: you need to set proper HTTP caching headers for `service-worker.js` file in `firebase.json` file or you will not be able to see changes after first deployment ([issue #2440](https://github.com/facebookincubator/create-react-app/issues/2440)). It should be added inside `"hosting"` key like next:
+
+```
+{
+  "hosting": {
+    ...
+    "headers": [
+      {"source": "/service-worker.js", "headers": [{"key": "Cache-Control", "value": "no-cache"}]}
+    ]
+    ...
+```
+
 Now, after you create a production build with `npm run build`, you can deploy it by running `firebase deploy`.
 
 ```sh
@@ -1915,12 +2097,18 @@ For more information see [Add Firebase to your JavaScript Project](https://fireb
 **The step below is important!**<br>
 **If you skip it, your app will not deploy correctly.**
 
-Open your `package.json` and add a `homepage` field:
+Open your `package.json` and add a `homepage` field for your project:
 
-```js
+```json
   "homepage": "https://myusername.github.io/my-app",
 ```
 
+or for a GitHub user page:
+
+```json
+  "homepage": "https://myusername.github.io",
+```
+
 Create React App uses the `homepage` field to determine the root URL in the built HTML file.
 
 #### Step 2: Install `gh-pages` and add `deploy` to `scripts` in `package.json`
@@ -1951,6 +2139,18 @@ Add the following scripts in your `package.json`:
 
 The `predeploy` script will run automatically before `deploy` is run.
 
+If you are deploying to a GitHub user page instead of a project page you'll need to make two
+additional modifications:
+
+1. First, change your repository's source branch to be any branch other than **master**.
+1. Additionally, tweak your `package.json` scripts to push deployments to **master**:
+```diff
+  "scripts": {
+    "predeploy": "npm run build",
+-   "deploy": "gh-pages -d build",
++   "deploy": "gh-pages -b master -d build",
+```
+
 #### Step 3: Deploy the site by running `npm run deploy`
 
 Then run:
@@ -2019,7 +2219,7 @@ In this case, ensure that the file is there with the proper lettercase and that
 **To do a manual deploy to Netlify’s CDN:**
 
 ```sh
-npm install netlify-cli
+npm install netlify-cli -g
 netlify deploy
 ```
 
@@ -2031,7 +2231,8 @@ With this setup Netlify will build and deploy when you push to git or open a pul
 
 1. [Start a new netlify project](https://app.netlify.com/signup)
 2. Pick your Git hosting service and select your repository
-3. Click `Build your site`
+3. Set `yarn build` as the build command and `build` as the publish directory
+4. Click `Deploy site`
 
 **Support for client-side routing:**
 
@@ -2091,9 +2292,10 @@ PORT | :white_check_mark: | :x: | By default, the development web server will at
 HTTPS | :white_check_mark: | :x: | When set to `true`, Create React App will run the development server in `https` mode.
 PUBLIC_URL | :x: | :white_check_mark: | Create React App assumes your application is hosted at the serving web server's root or a subpath as specified in [`package.json` (`homepage`)](#building-for-relative-paths). Normally, Create React App ignores the hostname. You may use this variable to force assets to be referenced verbatim to the url you provide (hostname included). This may be particularly useful when using a CDN to host your application.
 CI | :large_orange_diamond: | :white_check_mark: | When set to `true`, Create React App treats warnings as failures in the build. It also makes the test runner non-watching. Most CIs set this flag by default.
-REACT_EDITOR | :white_check_mark: | :x: | When an app crashes in development, you will see an error overlay with clickable stack trace. When you click on it, Create React App will try to determine the editor you are using based on currently running processes, and open the relevant source file. You can [send a pull request to detect your editor of choice](https://github.com/facebookincubator/create-react-app/issues/2636). Setting this environment variable overrides the automatic detection. If you do it, make sure your systems [PATH](https://en.wikipedia.org/wiki/PATH_(variable)) environment variable points to your editor’s bin folder.
+REACT_EDITOR | :white_check_mark: | :x: | When an app crashes in development, you will see an error overlay with clickable stack trace. When you click on it, Create React App will try to determine the editor you are using based on currently running processes, and open the relevant source file. You can [send a pull request to detect your editor of choice](https://github.com/facebookincubator/create-react-app/issues/2636). Setting this environment variable overrides the automatic detection. If you do it, make sure your systems [PATH](https://en.wikipedia.org/wiki/PATH_(variable)) environment variable points to your editor’s bin folder. You can also set it to `none` to disable it completely.
 CHOKIDAR_USEPOLLING | :white_check_mark: | :x: | When set to `true`, the watcher runs in polling mode, as necessary inside a VM. Use this option if `npm start` isn't detecting changes.
 GENERATE_SOURCEMAP | :x: | :white_check_mark: | When set to `false`, source maps are not generated for a production build. This solves OOM issues on some smaller machines.
+NODE_PATH | :white_check_mark: |  :white_check_mark: | Same as [`NODE_PATH` in Node.js](https://nodejs.org/api/modules.html#modules_loading_from_the_global_folders), but only relative folders are allowed. Can be handy for emulating a monorepo setup by setting `NODE_PATH=src`.
 
 ## Troubleshooting
 
@@ -2106,7 +2308,7 @@ If this doesn’t happen, try one of the following workarounds:
 * If the watcher doesn’t see a file called `index.js` and you’re referencing it by the folder name, you [need to restart the watcher](https://github.com/facebookincubator/create-react-app/issues/1164) due to a Webpack bug.
 * Some editors like Vim and IntelliJ have a “safe write” feature that currently breaks the watcher. You will need to disable it. Follow the instructions in [“Adjusting Your Text Editor”](https://webpack.js.org/guides/development/#adjusting-your-text-editor).
 * If your project path contains parentheses, try moving the project to a path without them. This is caused by a [Webpack watcher bug](https://github.com/webpack/watchpack/issues/42).
-* On Linux and macOS, you might need to [tweak system settings](https://webpack.github.io/docs/troubleshooting.html#not-enough-watchers) to allow more watchers.
+* On Linux and macOS, you might need to [tweak system settings](https://github.com/webpack/docs/wiki/troubleshooting#not-enough-watchers) to allow more watchers.
 * If the project runs inside a virtual machine such as (a Vagrant provisioned) VirtualBox, create an `.env` file in your project directory if it doesn’t exist, and add `CHOKIDAR_USEPOLLING=true` to it. This ensures that the next time you run `npm start`, the watcher uses the polling mode, as necessary inside a VM.
 
 If none of these solutions help please leave a comment [in this thread](https://github.com/facebookincubator/create-react-app/issues/659).
@@ -2184,6 +2386,12 @@ To resolve this:
 2. Fork the package and publish a corrected version yourself.
 3. If the dependency is small enough, copy it to your `src/` folder and treat it as application code.
 
+In the future, we might start automatically compiling incompatible third-party modules, but it is not currently supported. This approach would also slow down the production builds.
+
+## Alternatives to Ejecting
+
+[Ejecting](#npm-run-eject) lets you customize anything, but from that point on you have to maintain the configuration and scripts yourself. This can be daunting if you have many similar projects. In such cases instead of ejecting we recommend to *fork* `react-scripts` and any other packages you need. [This article](https://auth0.com/blog/how-to-configure-create-react-app/) dives into how to do it in depth. You can find more discussion in [this issue](https://github.com/facebookincubator/create-react-app/issues/682).
+
 ## Something Missing?
 
 If you have ideas for more “How To” recipes that should be on this page, [let us know](https://github.com/facebookincubator/create-react-app/issues) or [contribute some!](https://github.com/facebookincubator/create-react-app/edit/master/packages/react-scripts/template/README.md)
diff --git a/packages/react-scripts/template/src/App.test.tsx b/packages/react-scripts/template/src/App.test.tsx
index 2b4da0b9d..e0f09ab57 100644
--- a/packages/react-scripts/template/src/App.test.tsx
+++ b/packages/react-scripts/template/src/App.test.tsx
@@ -5,4 +5,5 @@ import App from './App';
 it('renders without crashing', () => {
   const div = document.createElement('div');
   ReactDOM.render(<App />, div);
+  ReactDOM.unmountComponentAtNode(div);
 });
diff --git a/packages/react-scripts/template/src/registerServiceWorker.ts b/packages/react-scripts/template/src/registerServiceWorker.ts
index 11c4bc72c..28c89f7b6 100644
--- a/packages/react-scripts/template/src/registerServiceWorker.ts
+++ b/packages/react-scripts/template/src/registerServiceWorker.ts
@@ -36,12 +36,21 @@ export default function register() {
     window.addEventListener('load', () => {
       const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
 
-      if (!isLocalhost) {
-        // Is not local host. Just register service worker
-        registerValidSW(swUrl);
-      } else {
+      if (isLocalhost) {
         // This is running on localhost. Lets check if a service worker still exists or not.
         checkValidServiceWorker(swUrl);
+
+        // Add some additional logging to localhost, pointing developers to the
+        // service worker/PWA documentation.
+        navigator.serviceWorker.ready.then(() => {
+          console.log(
+            'This web app is being served cache-first by a service ' +
+              'worker. To learn more, visit https://goo.gl/SC7cgQ'
+          );
+        });
+      } else {
+        // Is not local host. Just register service worker
+        registerValidSW(swUrl);
       }
     });
   }
diff --git a/screencast.svg b/screencast.svg
new file mode 100644
index 000000000..d92ef4c61
--- /dev/null
+++ b/screencast.svg
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\ No newline at end of file
diff --git a/tasks/cra.js b/tasks/cra.js
new file mode 100644
index 000000000..ec15d702a
--- /dev/null
+++ b/tasks/cra.js
@@ -0,0 +1,109 @@
+#!/usr/bin/env node
+/**
+ * Copyright (c) 2015-present, Facebook, Inc. 
+ * 
+ * This source code is licensed under the MIT license found in the 
+ * LICENSE file in the root directory of this source tree. 
+ */
+
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+const cp = require('child_process');
+
+const cleanup = () => {
+  console.log('Cleaning up.');
+  // Uncomment when snapshot testing is enabled by default:
+  // rm ./template/src/__snapshots__/App.test.js.snap
+};
+
+const handleExit = () => {
+  cleanup();
+  console.log('Exiting without error.');
+  process.exit();
+};
+
+const handleError = e => {
+  console.error('ERROR! An error was encountered while executing\n', e);
+  cleanup();
+  console.log('Exiting with error.');
+  process.exit(1);
+};
+
+process.on('SIGINT', handleExit);
+process.on('uncaughtException', handleError);
+
+// ******************************************************************************
+// Pack react- scripts so we can verify they work.
+// ******************************************************************************
+
+const rootDir = path.join(__dirname, '..');
+const reactScriptsDir = path.join(rootDir, 'packages', 'react-scripts');
+const packageJsonPath = path.join(reactScriptsDir, 'package.json');
+const packageJsonOrigPath = path.join(reactScriptsDir, 'package.json.orig');
+
+// Install all our packages
+const lernaPath = path.join(rootDir, 'node_modules', '.bin', 'lerna');
+cp.execSync(`${lernaPath} bootstrap`, {
+  cwd: rootDir,
+  stdio: 'inherit',
+});
+
+// Save package.json because we're going to touch it
+fs.writeFileSync(packageJsonOrigPath, fs.readFileSync(packageJsonPath));
+
+// Replace own dependencies (those in the`packages` dir) with the local paths
+// of those packages
+const replaceOwnDepsPath = path.join(__dirname, 'replace-own-deps.js');
+cp.execSync(`node ${replaceOwnDepsPath}`, { stdio: 'inherit' });
+
+// Finally, pack react-scripts
+// Don't redirect stdio as we want to capture the output that will be returned
+// from execSync(). In this case it will be the .tgz filename.
+const scriptsFileName = cp
+  .execSync(`npm pack`, { cwd: reactScriptsDir })
+  .toString()
+  .trim();
+const scriptsPath = path.join(
+  rootDir,
+  'packages',
+  'react-scripts',
+  scriptsFileName
+);
+
+// Restore package.json
+fs.unlinkSync(packageJsonPath);
+fs.writeFileSync(packageJsonPath, fs.readFileSync(packageJsonOrigPath));
+fs.unlinkSync(packageJsonOrigPath);
+
+// ******************************************************************************
+// Now that we have packed them, call the global CLI.
+// ******************************************************************************
+
+// If Yarn is installed, clean its cache because it may have cached react-scripts
+try {
+  cp.execSync('yarn cache clean');
+} catch (e) {
+  // We can safely ignore this as the user doesn't have yarn installed
+}
+
+const args = process.argv.slice(2);
+
+// Now run the CRA command
+const craScriptPath = path.join(
+  rootDir,
+  'packages',
+  'create-react-app',
+  'index.js'
+);
+cp.execSync(
+  `node ${craScriptPath} --scripts-version="${scriptsPath}" ${args.join(' ')}`,
+  {
+    cwd: rootDir,
+    stdio: 'inherit',
+  }
+);
+
+// Cleanup
+handleExit();
diff --git a/tasks/cra.sh b/tasks/cra.sh
deleted file mode 100755
index 7929cdbf5..000000000
--- a/tasks/cra.sh
+++ /dev/null
@@ -1,84 +0,0 @@
-#!/bin/bash
-# Copyright (c) 2015-present, Facebook, Inc.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-# ******************************************************************************
-# This creates an app with the global CLI and `react-scripts` from the source.
-# It is useful for testing the end-to-end flow locally.
-# ******************************************************************************
-
-# Start in tasks/ even if run from root directory
-cd "$(dirname "$0")"
-
-function cleanup {
-  echo 'Cleaning up.'
-  # Uncomment when snapshot testing is enabled by default:
-  # rm ./template/src/__snapshots__/App.test.js.snap
-}
-
-# Error messages are redirected to stderr
-function handle_error {
-  echo "$(basename $0): ERROR! An error was encountered executing line $1." 1>&2;
-  cleanup
-  echo 'Exiting with error.' 1>&2;
-  exit 1
-}
-
-function handle_exit {
-  cleanup
-  echo 'Exiting without error.' 1>&2;
-  exit
-}
-
-# Exit the script with a helpful error message when any error is encountered
-trap 'set +x; handle_error $LINENO $BASH_COMMAND' ERR
-
-# Cleanup before exit on any termination signal
-trap 'set +x; handle_exit' SIGQUIT SIGTERM SIGINT SIGKILL SIGHUP
-
-# Echo every command being executed
-set -x
-
-# Go to root
-cd ..
-root_path=$PWD
-
-# ******************************************************************************
-# Pack react-scripts so we can verify they work.
-# ******************************************************************************
-
-# Install all our packages
-"$root_path"/node_modules/.bin/lerna bootstrap
-
-cd packages/react-scripts
-
-# Save package.json because we're going to touch it
-cp package.json package.json.orig
-
-# Replace own dependencies (those in the `packages` dir) with the local paths
-# of those packages.
-node "$root_path"/tasks/replace-own-deps.js
-
-# Finally, pack react-scripts
-scripts_path="$root_path"/packages/react-scripts/`npm pack`
-
-# Restore package.json
-rm package.json
-mv package.json.orig package.json
-
-
-# ******************************************************************************
-# Now that we have packed them, call the global CLI.
-# ******************************************************************************
-
-# If Yarn is installed, clean its cache because it may have cached react-scripts
-yarn cache clean || true
-
-# Go back to the root directory and run the command from here
-cd "$root_path"
-node packages/create-react-app/index.js --scripts-version="$scripts_path" "$@"
-
-# Cleanup
-cleanup
diff --git a/tasks/e2e-old-node.sh b/tasks/e2e-old-node.sh
new file mode 100755
index 000000000..8245dd24e
--- /dev/null
+++ b/tasks/e2e-old-node.sh
@@ -0,0 +1,61 @@
+#!/bin/bash
+# Copyright (c) 2015-present, Facebook, Inc.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+# ******************************************************************************
+# This is an end-to-end test intended to run on CI.
+# You can also run it locally but it's slow.
+# ******************************************************************************
+
+# Start in tasks/ even if run from root directory
+cd "$(dirname "$0")"
+
+temp_app_path=`mktemp -d 2>/dev/null || mktemp -d -t 'temp_app_path'`
+
+function cleanup {
+  echo 'Cleaning up.'
+  cd "$root_path"
+  rm -rf $temp_app_path
+}
+
+# Error messages are redirected to stderr
+function handle_error {
+  echo "$(basename $0): ERROR! An error was encountered executing line $1." 1>&2;
+  cleanup
+  echo 'Exiting with error.' 1>&2;
+  exit 1
+}
+
+function handle_exit {
+  cleanup
+  echo 'Exiting without error.' 1>&2;
+  exit
+}
+
+# Exit the script with a helpful error message when any error is encountered
+trap 'set +x; handle_error $LINENO $BASH_COMMAND' ERR
+
+# Cleanup before exit on any termination signal
+trap 'set +x; handle_exit' SIGQUIT SIGTERM SIGINT SIGKILL SIGHUP
+
+# Echo every command being executed
+set -x
+
+# Go to root
+cd ..
+root_path=$PWD
+
+# We need to install create-react-app deps to test it
+cd "$root_path"/packages/create-react-app
+npm install
+cd "$root_path"
+
+# If the node version is < 6, the script should just give an error.
+cd $temp_app_path
+err_output=`node "$root_path"/packages/create-react-app/index.js test-node-version 2>&1 > /dev/null || echo ''`
+[[ $err_output =~ You\ are\ running\ Node ]] && exit 0 || exit 1
+
+# Cleanup
+cleanup
diff --git a/tasks/release.sh b/tasks/publish.sh
similarity index 84%
rename from tasks/release.sh
rename to tasks/publish.sh
index 0f11bb0d6..c1cae86c2 100755
--- a/tasks/release.sh
+++ b/tasks/publish.sh
@@ -26,21 +26,14 @@ set -x
 cd ..
 root_path=$PWD
 
-# You can only release with npm >= 3
-if [ $(npm -v | head -c 1) -lt 3 ]; then
-  echo "Releasing requires npm >= 3. Aborting.";
-  exit 1;
-fi;
-
 if [ -n "$(git status --porcelain)" ]; then
   echo "Your git status is not clean. Aborting.";
   exit 1;
 fi
 
-cd "$root_path"
 # Compile
 cd packages/react-error-overlay/
 npm run build:prod
 cd ../..
 # Go!
-./node_modules/.bin/lerna publish --independent "$@"
+./node_modules/.bin/lerna publish --independent "$@"
\ No newline at end of file
diff --git a/template/README.md b/template/README.md
deleted file mode 100644
index 32efd00ff..000000000
--- a/template/README.md
+++ /dev/null
@@ -1,4 +0,0 @@
-This page has moved!<br>
-Please update your link to point [here](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md) instead.
-
-Sorry for the inconvenience!