Create Singleton pattern using ES6

ES6_Singlet.js

'use strict';

/**
 * Created by Milan Karunarathne
 * Email: mhkarunarathne@gmail.com
 * May be freely distributed under the MIT license
 */
import EventEmitter from 'events'; 

class Single extends EventEmitter {

    constructor() {
        this.name = 'Singleton';
    }
    
    getName() {
        return this.name;
    }
    
    setName(name) {
        this.name = name;
    }

}

export default let single = new Single();

ES6_Singleton_test1.js

'use strict';

import Single from './ES6_Single';

console.log(`Test one: ${Singleton.getName()}`);
console.log(Singleton.setName('New Single'));

ES6_Singleton_test2.js

'use strict';

import Single from './ES6_Single';

setTimeout(() => {
    console.log(`Test two: ${Singleton.getName()}`);
}, 500);

Tried the same approach you have, but I get an error with unexpected token let:
export default let single = new Single();