It is saying the value is undefined because it is a constructor function, not a class with a constructor. In order to use it, you would need to use Customer() or customer().
First, you need to load file1.js before file2.js, like slebetman said:
<script defer src="file1.js" type="module"></script>
<script defer src="file2.js" type="module"></script>
Then, you could change your file1.js as follows:
export default class Customer(){
constructor(){
this.name="Jhon";
this.getName=function(){
return this.name;
};
}
}
And the file2.js as follows:
import { Customer } from "./file1";
var customer=new Customer();
Please correct me if I am wrong.