Merge pull request #61 from WordPress/update/node-version

Enforce using the latest LTS version (8.x) of Node and up

.travis.yml

@@ -2,7 +2,6 @@ sudo: false
 language: node_js
 node_js:
   - '8'
-  - '6'
 
 script:
   - npm run test:coverage-ci

CONTRIBUTING.md

@@ -16,7 +16,7 @@ You can pick among all the <a href="https://github.com/WordPress/packages/issues
 
 ## Developing
 
-Packages is built for Node 6 and up. You can check this with `node -v`.
+Be sure to have [Node.js](https://nodejs.org/en/) installed first. You should be running a Node.js version matching the [current active LTS release](https://github.com/nodejs/Release#release-schedule) or newer. You can check this with `node -v`.
 
 Make sure that npm is installed with version >= `5.0.0` using `npm -v`.
 

package.json

@@ -1,11 +1,16 @@
 {
   "license": "GPL-2.0-or-later",
+  "engines": {
+    "node": ">=8.0.0",
+    "npm": ">=5.0.0"
+  },
   "devDependencies": {
     "babel-core": "^6.25.0",
     "babel-loader": "^7.1.1",
     "babel-plugin-transform-object-rest-spread": "^6.23.0",
     "babel-preset-env": "^1.5.2",
     "chalk": "^2.0.1",
+    "check-node-version": "^3.1.1",
     "codecov": "^2.2.0",
     "glob": "^7.1.2",
     "jest": "^22.0.3",
@@ -24,6 +29,7 @@
   },
   "scripts": {
     "build-clean": "rimraf ./packages/*/build ./packages/*/build-module",
+    "prebuild": "check-node-version --package",
     "build": "node ./scripts/build.js",
     "postinstall": "lerna bootstrap && npm run build",
     "test": "jest",