React: catch duplicate attributes

[rstacruz]

no-dupe-keys catches these duplicates in an Object:

console.log({ hi: 1, hi: 1 })

but not these attributes in a React element:

import React from 'react'

window.hi(<div hi='1' hi='1'></div>)

[dtinth]

Relevant rule: react/jsx-no-duplicate-props.

[dcousens]

See standard/eslint-config-standard-react#8

[Flet]

Cool this has been published in eslint-config-standard-react@1.2.1 which was added to standard@5.4.0 via 80cc954

Closing!