Should throw on `async () => await 5 ** 6;`

[fisker]

espree parse this as await (5 ** 6)

require('espree').parse('async () => await 5 ** 6', {ecmaVersion: 2017}).body[0].expression.body
Node {
  type: 'AwaitExpression',
  start: 12,
  end: 24,
  argument: Node {
    type: 'BinaryExpression',
    start: 18,
    end: 24,
    left: Node { type: 'Literal', start: 18, end: 19, value: 5, raw: '5' },
    operator: '**',
    right: Node { type: 'Literal', start: 23, end: 24, value: 6, raw: '6' }
  }
}

In chrome, this is a syntax error

async () => await 5 ** 6
VM40:1 Uncaught SyntaxError: Unary operator used immediately before exponentiation expression. Parenthesis must be used to disambiguate operator precedence

Babel PR babel/babel#12441

[nzakas]

Can you please provide details in this issue? A link to a PR isn’t enough for us to evaluate this.

[fisker]

I updated the issue description.

[nzakas]

Thanks. This is actually an issue with Acorn, which Espree wraps. I’d suggest opening an issue there. We can pull in the updated version when it’s fixed.

[fisker]

I think acorn already fixed it https://github.com/acornjs/acorn/commit/848d14e20653a211b06c8e167810bd4fae2173cf

[nzakas]

Awesome, then we can look at incorporating it.

[mdjermanovic]

@fisker it seems that the latest Acorn still doesn't throw an error on this particular example. Can you open an issue on https://github.com/acornjs/acorn repository?

[robpalme]

@mdjermanovic as you requested, I have opened an issue and created a PR to fix this in Acorn.

[fisker]

Somehow, I missed this. Thank you @robpalme!

[mdjermanovic]

@robpalme thanks!

[robpalme]

This is now fixed in the Acorn 8.2.2 release.

[nzakas]

You are my hero @robpalme. Thank you.