ES6-compliant configuration

[GasparPizarro]

I am working on a SPA built with Webpack and I want to configure the Stretchy selector with Javascript, as opposed to doing it with the data-filter value. The problem is that, to my understanding, Stretchy is defining a global variable without any control. The only way I have to set the selector is

import "stretchy";
window.onload = function() {
    ...
    Stretchy.selectors.filter = ".my-selector";
    ...
}

Is that good practice? I mean, I would expect to do a named import, something like import * as Stretchy from "stretchy".