Resize font depending on string length

fontFitResize.js

var fontFitResize = function(fit, wrap, step = 0.5) {
    var currentSize;
    while(fit.offsetWidth < wrap.offsetWidth) {
        currentSize = parseFloat(window.getComputedStyle(wrap, null).getPropertyValue('font-size'));
        wrap.style.fontSize = (currentSize - step) + 'px';
        console.log(wrap.style.fontSize);
    }
}