Fabric.js Textbox resize according to specified height

script.js

// load canvas with id 'c'
const canvas = new fabric.Canvas('c');
// use canvas height as the height limit
var limit = canvas.height;

var text = new fabric.Textbox('Some very long text');
// set initial values
text.set({
    top: margin,
    width: canvas.width,
    textAlign: 'center',
    fontWeight: 'bold',
    fontSize: 12
});
while (text.width > canvas.width) {
    text.setWidth(text.width -= 10);
}
while (text.height >  limit) {
    text.set({fontSize: text.fontSize-1});
}
canvas.add(text);
text.centerH();
canvas.renderAll();