Update required Node.js version / Add version check

.travis.yml

@@ -8,12 +8,6 @@ matrix:
         - secure: 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
   include:
     # Linux tests
-    - os: linux
-      node_js: "4.4"
-      env: SLS_IGNORE_WARNING=*
-    - os: linux
-      node_js: "5.11"
-      env: SLS_IGNORE_WARNING=*
     - os: linux
       node_js: "6.2"
       env: SLS_IGNORE_WARNING=*

VERSIONING.md

@@ -49,6 +49,10 @@ Any non-backward compatible changes leads to a major version bump. This includes
 
 If we remove a helper function from the serverless object passed down to a plugin then this is a breaking change since some people might rely on it in custom made plugins.
 
+### Node.js versions
+
+The Serverless Framework supports the major cloud providers Node.js runtime versions. Support for old Node.js versions will be removed once Cloud providers announce that such runtimes are not supported anymore.
+
 ### FAQ
 
 1. Is it okay to mark a feature as deprecated in version 1.4.0 and then remove it in 1.8.0

bin/serverless

@@ -7,6 +7,20 @@ const BbPromise = require('bluebird');
 const logError = require('../lib/classes/Error').logError;
 const uuid = require('uuid');
 const initializeErrorReporter = require('../lib/utils/sentry').initializeErrorReporter;
+const semver = require('semver');
+const packageJson = require('../package.json');
+
+function checkNodeVersion(serverless) {
+  const requiredVersion = packageJson.engines.node;
+  const nodeVersion = process.version;
+  if (!semver.satisfies(nodeVersion, requiredVersion)) {
+    const msg = [
+      `Serverless Framework requires Node.js version ${requiredVersion}. `,
+      `You're running version ${nodeVersion}.`,
+    ].join('');
+    serverless.cli.log(msg);
+  }
+}
 
 Error.stackTraceLimit = Infinity;
 
@@ -40,6 +54,7 @@ const invocationId = uuid.v4();
   serverless.invocationId = invocationId;
 
   return serverless.init()
+    .then(() => checkNodeVersion(serverless))
     .then(() => serverless.run())
     .then(() => process.exit(0))
     .catch((err) => {

package.json

@@ -2,7 +2,7 @@
   "name": "serverless",
   "version": "1.43.0",
   "engines": {
-    "node": ">=4.0"
+    "node": ">=6.0"
   },
   "preferGlobal": true,
   "homepage": "https://github.com/serverless/serverless#readme",