parser can be sync

Author: yyx990803

lib/parser.js

@@ -3,7 +3,7 @@ var parser = new parse5.Parser(null, { locationInfo: true })
 
 module.exports = function (content) {
   this.cacheable()
-  var cb = this.async()
+
   var output = {
     template: [],
     style: [],
@@ -24,10 +24,10 @@ module.exports = function (content) {
       (type === 'script' || type === 'template') &&
       output[type].length > 0
     ) {
-      return cb(new Error(
+      throw new Error(
         '[vue-loader] Only one <script> or <template> tag is ' +
         'allowed inside a Vue component.'
-      ))
+      )
     }
 
     // handle src imports
@@ -88,7 +88,7 @@ module.exports = function (content) {
     })
   })
 
-  cb(null, 'module.exports = ' + JSON.stringify(output))
+  return 'module.exports = ' + JSON.stringify(output)
 }
 
 function commentScript (content, lang) {