Standard cannot parse React JSX files

What version of this package are you using? 13.1.0

What operating system, Node.js, and npm version? Node v12 OSX (latest)

What happened? Take a simple react JSX file (from: https://reactjs.org/docs/hooks-intro.html)

import React, { useState } from 'react'

function IndexPage () {
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  )
}

export default IndexPage

However, Standard cannot parse the file and thinks the { is not valid JSX:

> standard

standard: Use JavaScript Standard Style (https://standardjs.com)
  /Users/evan/workspace/evantahler.com/pages/index.js:8:22: Parsing error: Unexpected token {

This seems to be a new type of bug.

What did you expect to happen? Valid JS and Standard not to crash

Are you willing to submit a pull request to fix this bug? Sure!

[evantahler]

@feross Yes! That’s great detective work.

I had an old version of Acorn in some projects, and I started re-installing deps 1-by-1 until it worked… and the working build lacks a top-level acorn requirement.

[mightyiam]

I’ll take your word for it 🤣