Is there any difference between the following approaches? I am fond of the second approach as it is more clear but I am seeing Approach 1 also on the internet. So wondering if there any benefit of one approach over other.

Approach 1

Singleton.ts

class Singleton {
    private static _instance: Singleton | null = null
    
    private constructor() {}
    
    public static getInstance() {
        if (!Singleton._instance) {
            Singleton._instance = new Singleton()
        }
        return Singleton._instance
    }
    
    public doSomeWork() {}
}


export default Singleton

test1.ts

import Singleton from './Singleton'

Singleton.getInstance().doSomeWork()

test2.ts

import Singleton from './Singleton'

Singleton.getInstance().doSomeWork()

Approach 2

Singleton.ts

class Singleton {
    constructor() {
        
    }    
    
    public doSomeWork() {}
}


export default new Singleton()

test1.ts

import singleton from './Singleton'

singleton.doSomeWork()

test2.ts

import singleton from './Singleton'

singleton.doSomeWork()