Bump minimal Node version to 6

.travis.yml

@@ -1,7 +1,6 @@
 ---
 language: node_js
 node_js:
-  - 4
   - 6
   - 7
 cache:

README.md

@@ -40,9 +40,7 @@ Install it once globally:
 npm install -g create-react-app
 ```
 
-**You’ll need to have Node >= 4 on your machine**.
-
-**We strongly recommend to use Node >= 6 and npm >= 3 for faster installation speed and better disk usage.** You can use [nvm](https://github.com/creationix/nvm#usage) to easily switch Node versions between different projects.
+**You’ll need to have Node >= 6 on your machine**. You can use [nvm](https://github.com/creationix/nvm#usage) to easily switch Node versions between different projects.
 
 **This tool doesn’t assume a Node backend**. The Node installation is only required for Create React App itself.
 

appveyor.yml

@@ -14,12 +14,6 @@ environment:
       test_suite: "installs"
     - nodejs_version: 6
       test_suite: "kitchensink"
-    - nodejs_version: 4
-      test_suite: "simple"
-    - nodejs_version: 4
-      test_suite: "installs"
-    - nodejs_version: 4
-      test_suite: "kitchensink"
 
 cache:
   - node_modules -> appveyor.cleanup-cache.txt

packages/create-react-app/createReactApp.js

@@ -28,7 +28,7 @@
 // tell people to update their global version of create-react-app.
 //
 // Also be careful with new language features.
-// This file must work on Node 4+.
+// This file must work on Node 6+.
 //
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //   /!\ DO NOT MODIFY THIS FILE /!\
@@ -398,24 +398,23 @@ function getPackageName(installPackage) {
 }
 
 function checkNpmVersion() {
-  let isNpm2 = false;
+  let hasMinNpm = false;
   try {
     const npmVersion = execSync('npm --version').toString();
-    isNpm2 = semver.lt(npmVersion, '3.0.0');
+    hasMinNpm = semver.gte(npmVersion, '3.0.0');
   } catch (err) {
     return;
   }
-  if (!isNpm2) {
-    return;
+
+  if (!hasMinNpm) {
+    console.error(
+      chalk.red(
+        'Create React App requires npm 3 or higher. \n' +
+          'Please update your version of npm.'
+      )
+    );
+    process.exit(1);
   }
-  console.log(chalk.yellow('It looks like you are using npm 2.'));
-  console.log(
-    chalk.yellow(
-      'We suggest using npm 3 or Yarn for faster install times ' +
-        'and less disk space usage.'
-    )
-  );
-  console.log();
 }
 
 function checkNodeVersion(packageName) {

packages/create-react-app/index.js

@@ -41,13 +41,16 @@
 var chalk = require('chalk');
 
 var currentNodeVersion = process.versions.node;
-if (currentNodeVersion.split('.')[0] < 4) {
+var semver = currentNodeVersion.split('.');
+var major = semver[0];
+
+if (major < 6) {
   console.error(
     chalk.red(
       'You are running Node ' +
         currentNodeVersion +
         '.\n' +
-        'Create React App requires Node 4 or higher. \n' +
+        'Create React App requires Node 6 or higher. \n' +
         'Please update your version of Node.'
     )
   );

packages/create-react-app/package.json

@@ -8,7 +8,7 @@
   "repository": "facebookincubator/create-react-app",
   "license": "BSD-3-Clause",
   "engines": {
-    "node": ">=4"
+    "node": ">=6"
   },
   "bugs": {
     "url": "https://github.com/facebookincubator/create-react-app/issues"

packages/react-dev-utils/package.json

@@ -8,7 +8,7 @@
     "url": "https://github.com/facebookincubator/create-react-app/issues"
   },
   "engines": {
-    "node": ">=4"
+    "node": ">=6"
   },
   "files": [
     "ansiHTML.js",

packages/react-scripts/package.json

@@ -5,7 +5,7 @@
   "repository": "facebookincubator/create-react-app",
   "license": "BSD-3-Clause",
   "engines": {
-    "node": ">=4"
+    "node": ">=6"
   },
   "bugs": {
     "url": "https://github.com/facebookincubator/create-react-app/issues"

tasks/e2e-simple.sh

@@ -76,8 +76,11 @@ cd "$root_path"/packages/create-react-app
 npm install
 cd "$root_path"
 
-# If the node version is < 4, the script should just give an error.
-if [[ `node --version | sed -e 's/^v//' -e 's/\..*//g'` -lt 4 ]]
+# If the node version is < 6, the script should just give an error.
+nodeVersion=`node --version | cut -d v -f2`
+nodeMajor=`echo $nodeVersion | cut -d. -f1`
+nodeMinor=`echo $nodeVersion | cut -d. -f2`
+if [[ nodeMajor -lt 6 ]]
 then
   cd $temp_app_path
   err_output=`node "$root_path"/packages/create-react-app/index.js test-node-version 2>&1 > /dev/null || echo ''`