diff --git a/packages/@vue/cli-service/lib/Service.js b/packages/@vue/cli-service/lib/Service.js
index 9f3436b2a0..906a8993a9 100644
--- a/packages/@vue/cli-service/lib/Service.js
+++ b/packages/@vue/cli-service/lib/Service.js
@@ -56,7 +56,7 @@ module.exports = class Service {
     }
   }
 
-  init (mode = process.env.VUE_CLI_MODE) {
+ async init (mode = process.env.VUE_CLI_MODE) {
     if (this.initialized) {
       return
     }
@@ -71,7 +71,7 @@ module.exports = class Service {
     this.loadEnv()
 
     // load user config
-    const userOptions = this.loadUserOptions()
+    const userOptions = await this.loadUserOptions()
     this.projectOptions = defaultsDeep(userOptions, defaults())
 
     debug('vue:project-config')(this.projectOptions)
@@ -216,7 +216,7 @@ module.exports = class Service {
     this.setPluginsToSkip(args)
 
     // load env variables, load user config, apply plugins
-    this.init(mode)
+    await this.init(mode)
 
     args._ = args._ || []
     let command = this.commands[name]
@@ -302,7 +302,7 @@ module.exports = class Service {
     return config
   }
 
-  loadUserOptions () {
+  async loadUserOptions () {
     // vue.config.js
     let fileConfig, pkgConfig, resolved, resolvedFrom
     const configPath = (
@@ -313,6 +313,10 @@ module.exports = class Service {
       try {
         fileConfig = require(configPath)
 
+        if( fileConfig instanceof Promise){
+          fileConfig = await fileConfig
+        }
+
         if (typeof fileConfig === 'function') {
           fileConfig = fileConfig()
         }