Cannot find typings with NextJS (module: esnext)

[vfabioux]

Hi,

Thanks a lot for the package, I knew someone must have had the same idea (even though I want to use it for more than intl: for "variants" of messages)!

I have an error when trying to import anything in this library with NextJS:
Could not find a declaration file for module 'intl-ts'. '/node_modules/intl-ts/lib/module.mjs' implicitly has an 'any' type. There are types at '/node_modules/intl-ts/lib/index.d.ts', but this result could not be resolved when respecting package.json "exports". The 'intl-ts' library may need to update its package.json or typings.

Steps to reproduce:

• Create a NextJS app with default settings (npx create-next-app@latest).
• Try to import a function such as createMessages from this library into any TS file.

It works when I revert the changes from commit 1a00bcb. I'm not sure how to fix it properly without breaking retrocompatibility though.
tsconfig.json