Why does it not see connected modules when connecting a file?

Question

Node.js

Good afternoon. Please tell me why this code will not work?
config.js

(function log() {
  sayToConsole('All working!')
}())

app.js

function sayToConsole(text) {
  console.log(text)
}
require('./config.js')

Answer 1

Because you didn't send them to this included file?...
https://learn.javascript.ru/import-export
It's like