rename _assets to assets

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Former-commit-id: 6c24d30f26529457202f470620a0ea1d31772b13 [formerly 384d2af17fe100b9db91462eb41337f9dff855f4]
Former-commit-id: 94f4933e12f97ee7468c884f041612498e07ba32

assets/build/check-versions.js

@@ -0,0 +1,48 @@
+var chalk = require('chalk')
+var semver = require('semver')
+var packageConfig = require('../package.json')
+var shell = require('shelljs')
+function exec (cmd) {
+  return require('child_process').execSync(cmd).toString().trim()
+}
+
+var versionRequirements = [
+  {
+    name: 'node',
+    currentVersion: semver.clean(process.version),
+    versionRequirement: packageConfig.engines.node
+  }
+]
+
+if (shell.which('npm')) {
+  versionRequirements.push({
+    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)
+  }
+}