mark render functions with _withStripped in dev mode

Author: yyx990803

lib/template-compiler.js

@@ -47,6 +47,7 @@ function rewrite (attr, name) {
 
 module.exports = function (html) {
   this.cacheable()
+  var isProduction = this.minimize || process.env.NODE_ENV === 'production'
   var query = loaderUtils.parseQuery(this.query)
   var isServer = this.options.target === 'node'
   var vueOptions = this.options.__vueOptions__
@@ -68,10 +69,19 @@ module.exports = function (html) {
     })
     code = 'module.exports={render:function(){},staticRenderFns:[]}'
   } else {
+    var bubleOptions = vueOptions.buble
     code = transpile('module.exports={' +
       'render:' + toFunction(compiled.render) + ',' +
       'staticRenderFns: [' + compiled.staticRenderFns.map(toFunction).join(',') + ']' +
-    '}', vueOptions.buble)
+    '}', bubleOptions)
+    // mark with stripped (this enables Vue to use correct runtime proxy detection)
+    if (!isProduction && (
+      !bubleOptions ||
+      !bubleOptions.transforms ||
+      bubleOptions.transforms.stripWith !== false
+    )) {
+      code += `\nmodule.exports.render._withStripped = true`
+    }
   }
   // hot-reload
   if (!isServer &&