How to do client-server communication and replication?

Hello!

I'm trying to make a free to use engine which may help developers to simplify Roblox modules and scripts creation which is named RoApp.

I want to developers import RoApp, and used it just like this:

local app = RoApp.new("AppName", RoApp.Module)
function app.InitClient(player)
    ...
end
function app.InitServer()
    ...
end

I made it, but I can't made InitClient function. The function is defined in server script but it has to be a local script. There isn't a way to just send function by remote event or something like that.

Is there ways to do it?

Thank you.