resolve extra modules if nuxt linked (#2212)

lib/common/options.js

@@ -181,6 +181,7 @@ Options.defaults = {
   debug: undefined, // Will be equal to dev if not provided
   buildDir: '.nuxt',
   cacheDir: '.cache',
+  nuxtDir: resolve(__dirname, '..'), // Relative to dist
   nuxtAppDir: resolve(__dirname, '../lib/app/'), // Relative to dist
   build: {
     analyze: false,

lib/core/nuxt.js

@@ -19,6 +19,13 @@ export default class Nuxt {
     // Paths for resolving requires from `rootDir`
     this.nodeModulePaths = Module._nodeModulePaths(this.options.rootDir)
 
+    if (this.options.nuxtDir.indexOf(this.options.rootDir) !== 0) {
+      this.nodeModulePaths = [
+        ...this.nodeModulePaths,
+        ...Module._nodeModulePaths(this.options.nuxtDir)
+      ]
+    }
+
     this.initialized = false
     this.errorHandler = this.errorHandler.bind(this)
     // Hooks