Converting a quill delta into a string

QuillDeltaToString.js

// Assuming the delta is entirely insert operations,
// this example wouuld convert bolded text to html bolded text.
// The key logic here is mapping over the insert ops,
// then joining the resulting array on the empty string
html = delta.slice(0, 500).ops.map(function(op) {
   if (typeof op.insert !== 'string') return '';
   let html = op.insert;
   if (op.attributes.bold) {
      html = '<strong>' + html + '</strong>';
   }
   return html;
}).join('');