[feature]About the hard-coded list of excluded loaders chained before vue-loader (#697)

* make excluded preloader configurable

* fix the comment

* update the document

Author: nicholaslee119

docs/en/configurations/advanced.md

@@ -48,7 +48,10 @@ module.exports = {
           //   plugin will be a better option.
           postLoaders: {
             html: 'babel-loader'
-          }
+          },
+          
+          // `excludedPreLoaders` should be regex
+          excludedPreLoaders: /(eslint-loader)/
         }
       }
     ]

lib/loader.js

@@ -36,15 +36,13 @@ var defaultLang = {
 
 // When extracting parts from the source vue file, we want to apply the
 // loaders chained before vue-loader, but exclude some loaders that simply
-// produces side effects such as linting. This is a hard-coded list and
-// hopefully eslint-loader is the only one.
-var excludedPreLoadersRE = /eslint-loader/
-
-function getRawRequest (context) {
+// produces side effects such as linting.
+function getRawRequest (context, excludedPreLoaders) {
+  excludedPreLoaders = excludedPreLoaders || /eslint-loader/
   return loaderUtils.getRemainingRequest({
     resource: context.resource,
     loaderIndex: context.loaderIndex,
-    loaders: context.loaders.filter(loader => !excludedPreLoadersRE.test(loader.path))
+    loaders: context.loaders.filter(loader => !excludedPreLoaders.test(loader.path))
   })
 }
 
@@ -55,8 +53,8 @@ module.exports = function (content) {
 
   var loaderContext = this
   var query = loaderUtils.getOptions(this) || {}
-  var rawRequest = getRawRequest(this)
   var options = this.options.__vueOptions__ = Object.assign({}, this.options.vue, this.vue, query)
+  var rawRequest = getRawRequest(this, options.excludedPreLoaders)
 
   var filePath = this.resourcePath
   var fileName = path.basename(filePath)