Native event attribute does not work

[faisalhakim47]

Version

3.0.0-alpha.11

Reproduction link

https://codepen.io/faisalhakim47/pen/bGdPmaQ

Steps to reproduce

1. Create event handler with onclick attribute.
2. See the error console (in devtools).

vue.global.js:9997 Uncaught TypeError: Cannot use 'in' operator to search for 'options' in alert('from native')

What is expected?

Work

What is actually happening?

Error

---

Fix suggestion, in this file,

https://github.com/vuejs/vue-next/blob/899287ad35d8b74e76a71f39772a92f261dfa4f8/packages/shared/src/index.ts#L27

change the isOn conditions to something like:

export const isOn = (key: string) => key[0] === 'o' && key[1] === 'n' && key[2] === key[2].toUpperCase()