webpack 4 compatibility

Author: cseufert

lib/style-rewriter.js

@@ -33,7 +33,7 @@ module.exports = function (css, map) {
   var cb = this.async()
 
   var query = loaderUtils.getOptions(this) || {}
-  var options = this.options.vue || {}
+  var options = this.options && this.options.vue || {}
   var autoprefixOptions = options.autoprefixer
   var postcssOptions = options.postcss
 
@@ -58,7 +58,7 @@ module.exports = function (css, map) {
     autoprefixOptions = assign(
       {},
       // also respect autoprefixer-loader options
-      this.options.autoprefixer,
+      this.options && this.options.autoprefixer,
       autoprefixOptions
     )
     var autoprefixer = require('autoprefixer')(autoprefixOptions)