Typing issue when using isDeepEqual in differenceWith function

[eemelipa]

Current Behavior

Doing the following results in typing issue for the firstArray object Argument of type 'string[]' is not assignable to parameter of type 'readonly never[]'. Type 'string' is not assignable to type 'never'.ts(2345)

import * as R from 'remeda'

const firstArray = ['a', 'b', 'c']
const secondArray = ['a', 'c', 'd']

const difference = R.differenceWith(firstArray, secondArray, R.isDeepEqual)

Expected Behavior

It should be possible to directly use the isDeepEqual in the above use case and the types should be ok.

Workaround

At least two workarounds exist:

1. Explicitly give types for the differentWith
   • R.differenceWith<string, string>(firstArray, secondArray, R.isDeepEqual)
2. Use some other comparator for the is equal
   • R.differenceWith(firstArray, secondArray, (a, b) => a === b)

Related Information

This used to work in version 1.58.0 but it doesn't work anymore in 1.58.3. Changes done in #634 might have affected it.

[eranhirsch]

Thank you for reporting, I'll take a look

[TkDodo]

🎉 This issue has been resolved in version 1.60.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀