Standard: Unused variables don't output warnings

[jmz7v]

Problem:

The following small React component link.js has a useless destructured variable, it is not being caught by Standard.

import React from 'react'

const Link = ({ url, useless, children }) => (
  <a href={url}>{children}</a>
)

export default Link

What version of standard?

Standard: 12.0.1

What operating system, Node.js, and npm version?

OS: macOS 10.14 (18A391)
Node: v10.11.0
NPM: 6.4.1

What did you expect to happen?

To get an error like

link.js:3:22: 'useless' is assigned a value but never used.

What actually happened?

From what I can recall this would previously output an error since this is a conflict with one of the rules of Standard No unused variables.

Output:

empty output

[justinkalland]

From the best I can tell StandardJS has always skipped checking for unused arguments.

I have created a pull request that changes the behavior.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[feross]

Discussion moving here: https://github.com/standard/eslint-config-standard/pull/136