success open and validate gatsby-configs - 0.196s

 ERROR

This plugin file is using both CommonJS and ES6 module systems together which we don't support.
You'll need to edit the file to use just one or the other.

plugin: /mnt/c/Users/hoge/from-wsl/til/gatsby-browser.js

This didn't cause a problem in Gatsby v1 so you might want to review the migration doc for this:
https://gatsby.dev/no-mixed-modules

import React from "react"
import Layout from "./src/components/layout"

const wrapElement = ({ element, props }) => {
  return <Layout {...props}>{element}</Layout>
}

export { wrapElement as wrapPageElement }