revert named exports support due to module format complexity

Author: yyx990803

lib/loader.js

@@ -161,15 +161,11 @@ module.exports = function (content) {
   }
 
   var exports =
-    '__vue_options__ = __vue_exports__ = ' +
-      '__vue_exports__ || { default: {}, __esModule: true }\n' +
+    '__vue_options__ = __vue_exports__ = __vue_exports__ || {}\n' +
     // ES6 modules interop
-    'if (__vue_options__.__esModule) {\n' +
-    '  __vue_options__ = __vue_options__.default\n' +
-    // Webpack 2 interop
-    '} else if (typeof __vue_options__.default === "object") {\n' +
-    '  __vue_options__ = __vue_options__.default\n' +
-    '  __vue_exports__.__esModule = true\n' +
+    'if (typeof __vue_exports__.default === "object") {\n' +
+      (isProduction ? '' : 'if (Object.keys(__vue_exports__).length > 1) console.error("[vue-loader]: named exports are not supported.")\n') +
+      '__vue_options__ = __vue_exports__ = __vue_exports__.default\n' +
     '}\n' +
     // constructor export interop
     'if (typeof __vue_options__ === "function") {\n' +
@@ -230,15 +226,15 @@ module.exports = function (content) {
         '")}\n'
     }
     // final export
-    output += '\nmodule.exports = __vue_exports__ || __vue_options__\n'
+    output += '\nmodule.exports = __vue_exports__\n'
   } else {
     // inject-loader support
     output +=
       '\n/* dependency injection */\n' +
       'module.exports = function (injections) {\n' +
       '  __vue_exports__ = __vue_exports__(injections)\n' +
       exports +
-      '  return __vue_exports__ || __vue_options__\n' +
+      '  return __vue_exports__\n' +
       '}'
   }
 

test/fixtures/basic.vue

@@ -3,10 +3,6 @@
 </template>
 
 <script>
-export function test () {
-  return 'hi'
-}
-
 export default {
   data () {
     return {

test/test.js

@@ -79,8 +79,6 @@ describe('vue-loader', function () {
     test({
       entry: './test/fixtures/basic.vue'
     }, function (window, module, rawModule) {
-      // test named export
-      expect(rawModule.test()).to.equal('hi')
       assertRenderFn(module, '<h2 class="red">{{msg}}</h2>')
       expect(module.data().msg).to.contain('Hello from Component A!')
       var style = window.document.querySelector('style').textContent
@@ -183,7 +181,7 @@ describe('vue-loader', function () {
         column: col
       })
       expect(pos.source.indexOf('basic.vue') > -1)
-      expect(pos.line).to.equal(13)
+      expect(pos.line).to.equal(9)
       done()
     })
   })