check node version on postinstall & while initiating a new project

check.js

@@ -0,0 +1,22 @@
+const colors = require('chalk');
+const pkg = require('./package.json');
+
+const version = parseFloat( process.version.substr(1) );
+const minimum = parseFloat( pkg.engines.node.match(/\d+/g).join('.') );
+
+module.exports = function () {
+  if (version >= minimum) {
+    return true;
+  }
+
+	const errorMessage = colors.yellow(`
+
+		⚠️ preact-cli requires at least node@${minimum}!
+		You have node@${version}
+
+	`);
+
+  // version not supported && exit
+  process.stdout.write(errorMessage) + '\n';
+  process.exit(1);
+};

package.json

@@ -13,6 +13,7 @@
     "dev": "babel-node src",
     "lint": "eslint src tests",
     "pretest": "npm run -s build",
+    "postinstall": "node check.js",
     "test": "tape -r babel-register tests/*.test.js | tap-diff",
     "test:build": "babel-node src build --cwd examples/root",
     "test:serve": "npm run -s test:build && babel-node src serve --port 3000 --cwd examples/root",
@@ -27,7 +28,8 @@
   },
   "files": [
     "lib",
-    "examples"
+    "examples",
+    "check.js"
   ],
   "keywords": [
     "preact",
@@ -115,8 +117,8 @@
     "es6-promisify": "^5.0.0",
     "file-loader": "^0.11.1",
     "fs.promised": "^3.0.0",
-    "html-webpack-plugin": "^2.28.0",
     "html-webpack-exclude-assets-plugin": "0.0.5",
+    "html-webpack-plugin": "^2.28.0",
     "isomorphic-unfetch": "^2.0.0",
     "json-loader": "^0.5.4",
     "less": "^2.7.2",

src/index.js

@@ -8,9 +8,12 @@ import serve from './commands/serve';
 import installHooks from './lib/output-hooks';
 import pkg from '../package.json';
 import logo from './lib/logo';
+import checkVersion from './../check';
 
 global.Promise = require('promise-polyfill');
 
+checkVersion();
+
 installHooks();
 
 yargs