Support messageformat v3

[eshkard]

Hi npm shows warning on "messageformat" package renamed as @messageformat/core.
Will you address this dependency issue?

"warning messageformat@2.3.0: Package renamed as '@messageformat/core', see messageformat.github.io for more details. 'messageformat' will eventually provide a polyfill for Intl.MessageFormat, once it's been defined by Unicode & ECMA."

Thank's,
Evgeny

[lephyrus]

It's not just a renamed package - the new version has a number of breaking changes. I have to adapt a few things, shouldn't be hard.

[lephyrus]

Turns out the changes in messageformat v3 are anything but trivial for the way we use it, as a compiler at runtime. Don't expect this library to support v3 anytime soon, sorry.

[tuuling]

Turns out the changes in messageformat v3 are anything but trivial for the way we use it, as a compiler at runtime. Don't expect this library to support v3 anytime soon, sorry.

If someone were to provide a PR that supports v3, would you consider making a new major release with messageformat 3 support?

[lephyrus]

Sorry that support for messageformat v3 is still missing. It's actually pretty much done here: #83. I need to go back and make sure I really understand what behaves differently so there are no bad surprises. I should be able to do it in the coming days.