make-or-call.js

function make(classOrFn, ...args) {
    if (classOrFn.toString().startsWith('class ')) {
        // "real" non-compiled ES6+ only
        return new classOrFn(...args);
    }
    let thisArg = Object.create(classOrFn.prototype);
    let retVal = classOrFn.apply(thisArg, args)
    if (retVal != null) return retVal;
    return thisArg; //
}