global is undefined

[Arichy]

Version

2.5.16

Reproduction link

https://jsfiddle.net/50wL7mdz/449624/

Steps to reproduce

When you open it, it will just alert the bug.
And I used document.write to show it on html, though it sometimes doesn't work.

What is expected?

The code should run correctly

What is actually happening?

TypeError happened.

---

I'm using ES6 syntax import to import Vue.js in Safari (script[type=module]) ,but it seems the module closure makes 'this' of top level point undefined so global becomes undefined rather than window.
In order to show the bug clearly, I used dynamic import instead of static import on JSFiddle.

[sqal]

Browser ESM build is not available yet #7110

[posva]

The browser module version is another one: https://unpkg.com/vue/dist/vue.esm.browser.js
But please, refer to #7110 to track this 🙂