refactor[core]: use webpack-dev-server now (#355)

* bump deps: update vue-splitpane version

* refactor[chore]: use webpack-dev-serve build

* perf:settings

* doc: uodate readme

build/check-versions.js

@@ -1,45 +1,54 @@
-var chalk = require('chalk')
-var semver = require('semver')
-var packageConfig = require('../package.json')
+'use strict'
+const chalk = require('chalk')
+const semver = require('semver')
+const packageConfig = require('../package.json')
+const shell = require('shelljs')
 
-function exec(cmd) {
-    return require('child_process').execSync(cmd).toString().trim()
+function exec (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
-    }
+const 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)
-            )
-        }
+  const warnings = []
+
+  for (let i = 0; i < versionRequirements.length; i++) {
+    const 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 (let i = 0; i < warnings.length; i++) {
+      const warning = warnings[i]
+      console.log('  ' + warning)
     }
 
-    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)
-    }
+    console.log()
+    process.exit(1)
+  }
 }