Unexpected `STRINGPREP_CONTAINS_UNASSIGNED` error

As reported in https://github.com/Uniswap/interface/issues/2876, users with emojis in their ENS names are experiencing crashes due to a STRINGPREP_CONTAINS_UNASSIGNED error being thrown in #namehash. While this is solvable for us, perhaps it points to some underlying issue in ethers, hence the issue.

The following code errors, as tested here: https://github.com/Uniswap/interface/pull/2925/files#diff-5505dde3421656b51959add7972d69203d6faa0dfc3f05a7835c455799f2fac6R9.

import { namehash } from '@ethersproject/hash'

namehash('🤔')

[baptistegreve]

Hey! What is the recommended workaround for this?

[Arachnid]

Encountered the issue as well, seems like ens has switched from ascii to unicode recently, see: ensdomains/eth-ens-namehash@f62f351 from:

function normalize(name) {
  return name ? uts46.toAscii(name, {useStd3ASCII: true, transitional: false}) : name
}

to:

function normalize(name) {
  return name ? uts46.toUnicode(name, {useStd3ASCII: true, transitional: false}) : name
}

ENS has always used unicode, but the app was mistakenly using the wrong function to normalise names for a short while.