Find broken PNG assets in a project.

broken.js

var all = document.body.innerText.match(/\w{32}\.png/g);
var broken = [];
all.forEach(function(a) {
  var xhr = new XMLHttpRequest;
  xhr.open('GET', 'http://cdn.scratch.mit.edu/internalapi/asset/'+a+'/get/', false);
  xhr.send();
  if (/^<svg/.test(xhr.responseText)) {
    broken.push(a);
    console.log('http://cdn.scratch.mit.edu/internalapi/asset/'+a+'/get/');
  }
});
copy(broken.map(function(a) {return '- ['+a+'](http://cdn.scratch.mit.edu/internalapi/asset/'+a+'/get/)'}).join('\n'));