internals: improve options module (#1392)

lib/common/options.js

@@ -3,7 +3,11 @@ import { join, resolve } from 'path'
 import { existsSync } from 'fs'
 import { isUrl, isPureObject } from 'utils'
 
-export default function Options (_options) {
+const Options = {}
+
+export default Options
+
+Options.from = function (_options) {
   // Clone options to prevent unwanted side-effects
   const options = Object.assign({}, _options)
 

lib/core/nuxt.js

@@ -15,7 +15,7 @@ export default class Nuxt extends Tapable {
   constructor (_options = {}) {
     super()
 
-    this.options = Options(_options)
+    this.options = Options.from(_options)
 
     // Paths for resolving requires from `rootDir`
     this.nodeModulePaths = Module._nodeModulePaths(this.options.rootDir)