Can't transpile module which using .mjs extension

[padinko]

Version

v2.10.2

Reproduction link

https://codesandbox.io/s/nuxt-mjs-transpile-problem-mo9to

Steps to reproduce

If you import package, which is using .mjs extension, and add transpile to this module, imported code is not transpiled

for example:

1. npm i rope-sequence
2. import it somewhere import 'rope-sequence'
3. add transpile this module to nuxt.config.js transpile: [({ isLegacy }) => isLegacy && "rope-sequence"]
4. open in IE.. there is error in console

What is expected ?

transpiled module - no const/let and arrow functions

What is actually happening?

module has const and arrow functions

Additional comments?

now I can update regex for babel-loader to /\.m?jsx?$/i and everythink works good in IE
reproduction link with workaround https://codesandbox.io/s/nuxt-mjs-transpile-problem-workaround-z1tme
see nuxt.config.js -> build -> extend

[dargmuesli]

Looks like this will be fixed with the next version of @nuxt/webpack: #9180

[pencilcheck]

Thanks for the use of transpile, this also solves @trpc/client and @trpc/server not working since they also uses mjs but I don't need to add the workaround which is nice

[rchl]

There was also a follow-up PR at #10340 so I would say that this can be closed.