Better not found errors for ESM
When not using a file extension in ESM - eg import pkg from './path'
we currently just throw a straightforward not found error. As proposed by @MylesBorins
in https://github.com/nodejs/modules/issues/443 it would be useful to enhance this error message.
Ideally the error message should run the CJS resolver and say "the CJS resolver would have resolved this module to ...". We actually previously had this code path implemented by @bmeck
but it seems to have got lost along the way. See the early implementation at https://github.com/nodejs/node/pull/14369/files#diff-3e94629c67625a2547d1507d0a547211R20.
Sorry @bmeck
I think I might have dropped this and forgot to add it back when refactoring error codes to be standard. That was bad.