check-versions.js
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check-versions.js
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	var semver = require('semver')
	var chalk = require('chalk')
	var packageConfig = require('../package.json')
	var exec = function (cmd) {
	return require('child_process')
	.execSync(cmd).toString().trim()
	}

	var versionRequirements = [
	{
	name: 'node',
	currentVersion: semver.clean(process.version),
	versionRequirement: packageConfig.engines.node
	},
	{
	name: 'npm',
	currentVersion: exec('npm --version'),
	versionRequirement: packageConfig.engines.npm
	}
	]

	module.exports = function () {
	var warnings = []
	for (var i = 0; i < versionRequirements.length; i++) {
	var mod = versionRequirements[i]
	if (!semver.satisfies(mod.currentVersion, mod.versionRequirement)) {
	warnings.push(mod.name + ': ' +
	chalk.red(mod.currentVersion) + ' should be ' +
	chalk.green(mod.versionRequirement)
	)
	}
	}

	if (warnings.length) {
	console.log('')
	console.log(chalk.yellow('To use this template, you must update following to modules:'))
	console.log()
	for (var i = 0; i < warnings.length; i++) {
	var warning = warnings[i]
	console.log(' ' + warning)
	}
	console.log()
	process.exit(1)
	}
	}