As Marcelo Lazaroni has already said,
Although currently there is no way to declare a method or property as private, ES6 modules are not in the global namespace. Therefore, anything that you declare in your module and do not export will not be available to any other part of your program, but will still be available to your module during run time.
But his example didn't show how the private method could access members of the instance of the class. Max shows us some good examples of how access instance members through binding or the alternative of using a lambda method in the constructor, but I would like to add one more simple way of doing it: passing the instance as a parameter to the private method. Doing it this way would lead Max's MyClass to look like this:
function myPrivateFunction(myClass) {
console.log("My property: " + myClass.prop);
}
class MyClass() {
constructor() {
this.prop = "myProp";
}
testMethod() {
myPrivateFunction(this);
}
}
module.exports = MyClass;
Which way you do it really comes down to personal preference.
