const foo = module.exports = yadablah(){}; Why the const foo before module.exports?

Question

I understand the concept of module.exports as being a container object, with property exports, which is returned when required.

But what is the purpose of "const foo =" here?

edit:

(Module user.js)

const User = module.exports = mongoose.model('User', userSchema);
module.exports.getUserById = function(id, callback){
    User.findById(id, callback);
}

Okay. That makes sense now that I typed out the context. I initially misread " User .findById" as a different var (const). That was embarrassing!

Answer 1

This is what module looks like:

var module = { 
      exports: {
         yadablah: function(){
           //code
         }
} };

foo and module.exports both reference to the same object here that is function

yadablah()