[question]: Property 'User' does not exist on type OneSignal

[BraeschAntoine]

How can we help?

Hello,

I'm currently trying to just set the language for OneSignal.
I updated from version 4.4.1, at the time the app was written in plain javascript, so now i updated all librairies and i'm currently in the latest version. I read in the docs and i see that now I have to use
OneSignal.User.setLanguage(lang)
but my typescript is throwing me the following error : Property 'User' does not exist on type...

I'm aware that it might be a problem with my typescript configuration but i can't figure what so I wonder if someone can explain me what I'm doing wrong.

Thanks a lot !

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[BraeschAntoine]

Seems quite odd to have to install something to fix a dev problem lol
Edit : the previous comment has been deleted, was trying to make me install something, so i guess it was a scam