fix(core): use options.extensions for resolvePath

lib/core/nuxt.js

@@ -3,9 +3,10 @@ const enableDestroy = require('server-destroy')
 const Module = require('module')
 const { isPlainObject } = require('lodash')
 const chalk = require('chalk')
+const { existsSync } = require('fs-extra')
 const { Options } = require('../common')
 const { sequence, printError, printWarn } = require('../common/utils')
-const { join, resolve } = require('path')
+const { resolve } = require('path')
 const { version } = require('../../package.json')
 const ModuleContainer = require('./module')
 const Renderer = require('./renderer')
@@ -182,22 +183,30 @@ module.exports = class Nuxt {
   resolvePath(path) {
     // Try to resolve using NPM resolve path first
     try {
-      let resolvedPath = Module._resolveFilename(path, {
+      const resolvedPath = Module._resolveFilename(path, {
         paths: this.options.modulesDir
       })
       return resolvedPath
-    } catch (e) {
+    } catch (error) {
-      // Continue to try other methods
+      if (error.code === 'MODULE_NOT_FOUND') {
+        // Continue to try other methods
+      } else {
+        throw error
+      }
     }
 
-    // Shorthand to resolve from project dirs
+    let _path = path
     if (path.indexOf('@@') === 0 || path.indexOf('~~') === 0) {
-      return join(this.options.rootDir, path.substr(2))
+      _path = resolve(this.options.rootDir, path.substr(2))
     } else if (path.indexOf('@') === 0 || path.indexOf('~') === 0) {
-      return join(this.options.srcDir, path.substr(1))
+      _path = resolve(this.options.srcDir, path.substr(1))
     }
 
-    return resolve(this.options.srcDir, path)
+    for (let ext of [''].concat(this.options.extensions)) {
+      if (existsSync(_path + ext)) {
+        return _path + ext
+      }
+    }
   }
 
   async close(callback) {