with(this) issue when using buble

fix #20

Author: znck

src/index.js

@@ -123,14 +123,14 @@ export default function vue(options = {}) {
             const map = new MagicString(source);
 
             return {
-                code: source.replace(/if[\s]*\('__VUE_WITH_STATEMENT__'\)/g, 'with(this)'),
+                code: source.replace(/if[\s]*\(window\.__VUE_WITH_STATEMENT__\)/g, 'with(this)'),
                 map: map.generateMap({ hires: true }),
             };
         },
         ongenerate(opts, rendered) {
             generateStyleBundle();
             rendered.code = rendered.code.replace(
-                /if[\s]*\('__VUE_WITH_STATEMENT__'\)/g, 'with(this)');
+                /if[\s]*\(window\.__VUE_WITH_STATEMENT__\)/g, 'with(this)');
         },
     };
 }

src/vueTransform.js

@@ -47,7 +47,7 @@ function padContent(content) {
 function wrapRenderFunction(code) {
     // Replace with(this) by something that works on strict mode
     // https://github.com/vuejs/vue-template-es2015-compiler/blob/master/index.js
-    code = code.replace(/with\(this\)/g, "if('__VUE_WITH_STATEMENT__')");
+    code = code.replace(/with\(this\)/g, "if(window.__VUE_WITH_STATEMENT__)");
     return `function(){${code}}`;
 }