Fix template hmr, fix #863 (#874)

* fix template hmr

* oops

* reset yarn.lock

Author: egoist

lib/template-compiler/index.js

@@ -46,7 +46,7 @@ module.exports = function (html) {
       compiled.errors.map(e => `  - ${e}`).join('\n') + '\n'
     )
     code = vueOptions.esModule
-      ? `export function render () {}\nexport var staticRenderFns = []`
+      ? `var esExports = {render:function(){},staticRenderFns: []}\nexport default esExports`
       : 'module.exports={render:function(){},staticRenderFns:[]}'
   } else {
     var bubleOptions = options.buble
@@ -65,16 +65,17 @@ module.exports = function (html) {
     }
     var exports = `{ render: render, staticRenderFns: staticRenderFns }`
     code += vueOptions.esModule
-      ? `export default ${exports}`
+      ? `var esExports = ${exports}\nexport default esExports`
       : `module.exports = ${exports}`
   }
   // hot-reload
   if (!isServer && !isProduction) {
+    var exportsName = vueOptions.esModule ? 'esExports' : 'module.exports'
     code +=
       '\nif (module.hot) {\n' +
       '  module.hot.accept()\n' +
       '  if (module.hot.data) {\n' +
-      '     require("' + hotReloadAPIPath + '").rerender("' + options.id + '", module.exports)\n' +
+      '     require("' + hotReloadAPIPath + '").rerender("' + options.id + '", ' + exportsName + ')\n' +
       '  }\n' +
       '}'
   }