env - environment task to test against engine in package.json and one executing

gulpfile.js

var gulp = require('gulp');
var validatenv = require('validate-node-version')();
 
gulp.task( 'env' , function (){
  if( !validatenv.satisfies ){
    console.error(validatenv.message);
    process.exit(1);
  }
});

package.json

{
  "name": "myapp",
  "version": "1.0.0",
  "description": "myapp",
  "main": "index.js",
  "private": true,
  "license": "BSD",
  "engines" : {
      "node" : "0.12.7"
  },
  "devDependencies": {
    "gulp": "3.9.0",
    "validate-node-version": "1.1.1"
  }
}