Now that most of the libraries are already in ESM, I think it's time Feathers also release an ESM build. It should be pretty easy just to change the module from commonjs to ES2020 a few other changes mentioned in https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c.

The advantage is then I could just do

import { Forbidden } from '@feathersjs/errors'

instead of

import errors from '@feathersjs/errors'
const { Forbidden } = errors;