Callback that activates when a new user is created? (docs are not accurate)

export const auth = betterAuth({
    hooks: {
        after: createAuthMiddleware(async (ctx) => {
            if(ctx.path.startsWith("/sign-up")){
                const newSession = ctx.context.newSession;
                if(newSession){
                    sendMessage({
                        type: "user-register",
                        name: newSession.user.name,
                    })
                }
            }
        }),
    },
});