fix: use esm in template export

Author: yyx990803

lib/template-compiler/index.js

@@ -45,9 +45,7 @@ module.exports = function (html) {
         compiled.errors.map(e => `  - ${e}`).join('\n') +
         '\n'
     )
-    code = vueOptions.esModule
-      ? `var esExports = {render:function(){},staticRenderFns: []}\nexport default esExports`
-      : 'module.exports={render:function(){},staticRenderFns:[]}'
+    code = `export default { render:function () {}, staticRenderFns: [] }`
   } else {
     const bubleOptions = options.buble
     const stripWith = bubleOptions.transforms.stripWith !== false
@@ -77,20 +75,16 @@ module.exports = function (html) {
     if (!isProduction && stripWith) {
       code += `render._withStripped = true\n`
     }
-    const exports = `{ render: render, staticRenderFns: staticRenderFns }`
-    code += vueOptions.esModule
-      ? `var esExports = ${exports}\nexport default esExports`
-      : `module.exports = ${exports}`
+    code += `export default { render: render, staticRenderFns: staticRenderFns }`
   }
   // hot-reload
   if (needsHotReload) {
-    const 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 + '", ' + exportsName + ')\n' +
+      '      .rerender("' + options.id + '", { render: render, staticRenderFns: staticRenderFns })\n' +
       '  }\n' +
       '}'
   }