How to structure utility class

If you create a file utils.ts which contains

export default class Utils {
    static doSomething(val: string) { return val; }
    static doSomethingElse(val: string) { return val; }
}

then you can simplify your client code like this:

import Utils from './utils'

export class MyClass {
     constructor()
     {
         Utils.doSomething("test");
     }
}