Issue while loading jquery cropzee function in magento2

this my phtml file

 require(['jquery','croppr','canvastoblob','FileSaver'],
  function($,croppr,canvastoblob,FileSaver){

$(document).ready(function($) {
    $("#crop").cropzee();
});

var defaultWidth = 210;
$.fn.extend({
    cropzee: function (options = {
    aspectRatio: null,
            maxSize: null,
            minSize: null,
            startSize: [100, 100, '%'],
           .....
           ......
           })
        })

while loading this page show an error in the console like this index:373 Uncaught TypeError: $(...).cropzee is not a function. is there any error in the function call or somewhere else? anybody, please help me to fix this error.

Thanks in advance