How to call an exported function internally in nodejs?

Question

I am trying to call an exported function inside the nodejs module.

exports.sayHello = function (msg) {
 console.log(msg) 
}

function run(msg) {
  this.sayHello(msg);
}

run("hello");

when I run this script I got TypeError: this.sayHello is not a function

Answer 1

Simply declare it separately from exporting it (and don't use this when calling it, you haven't attached it to an object):

function sayHello(msg) {
 console.log(msg) 
}
exports.sayHello = sayHello;

function run(msg) {
  sayHello(msg);
}

run("hello");

That said, you could call it via exports :

exports.sayHello = function (msg) {
 console.log(msg) 
}

function run(msg) {
  exports.sayHello(msg); // <===
}

run("hello");

...but that seems a bit roundabout to me, though I'm told it can help with testing, such as in this example .