So I am a newbie and learning app script. Is there a way where I can export and import functions from different .gs files?

In my code.gs, I have the code:

function test() {
    callMe("hello world")
}

and I have a helper.gs file where some functions live.

function callMe(msg) { Logger.log(msg) }
function quit() { Logger.log("quitting") }

Now, when I run the script, it throws an error: ReferenceError: msg is not defined

Basically, I want to create helper functions and then export them so as to organize my code inside code.gs.