utopia-ui/patches/react-dropzone/attr-accept.js

/**
 * Patched version of attr-accept to fix compatibility issues with react-dropzone
 */

function attrAccept(file, acceptedFiles) {
  if (file && acceptedFiles) {
    var acceptedFilesArray = Array.isArray(acceptedFiles) ? acceptedFiles : acceptedFiles.split(',');

    if (acceptedFilesArray.length === 0) {
      return true;
    }

    var fileName = file.name || '';
    var mimeType = (file.type || '').toLowerCase();
    var baseMimeType = mimeType.replace(/\/.*$/, '');

    return acceptedFilesArray.some(function (type) {
      var validType = type.trim().toLowerCase();

      if (validType.charAt(0) === '.') {
        return fileName.toLowerCase().endsWith(validType);
      } else if (validType.endsWith('/*')) {
        // This is something like a image/* mime type
        return baseMimeType === validType.replace(/\/.*$/, '');
      }

      return mimeType === validType;
    });
  }

  return true;
}

// Export as both default and named export to support different import styles
export default attrAccept;
export { attrAccept };