modular function in plain js

module_function.js

const ModuleA = (function traceA(){
  
  function log(){
    console.log(this.foo);     
  }
 
  function bar(){
    this.foo = 'bar';
    log.call(this, null);
  }

  bar();
  
});

ModuleA();
console.log(ModuleA.name);