resetPassword function isn't working in Mongodb

Question

I am using sendResetPasswordEmail in the Ionic React app to reset the user password, we have got the new password in the database and we try to use resetPassword in Realm > Build > Functions resetPassword function, I know I need to use: await app.emailPasswordAuth.resetPassword(token, tokenId, password), however, I just can't get the app working: let app = new Realm.App(appConfig); const Realm = require("realm"); It's either undefine app or realm modules.

here is part of the code in the functions and the errors that show up