How to use

errors

function

in

Array

/**
 * Ensure that required fields have been submitted for each upload.
 *
 * @param {Object[]} files
 *  Files to validate
 * @param {Object} data
 *  Request data
 * @returns {Error[]}
 *  Validation errors, if any.
 * @memberof APIUploadHandler
 */
function validateAllMetadata(files, data) {
 const errors = [],
  processedFields = ['multiple'],
  multiple = Boolean(data.multiple);

 if (files.length > 1 && !multiple)
  errors.push(new Error(`Received more than one file, but 'multiple' flag is not set.`));

 for (let file of files) {
  const validationResult = validateMetadata(file, data, { addSuffix: multiple });
  errors.push(...validationResult.errors);
  processedFields.push(...validationResult.processedFields);
 }
 const remainingFields = Object.keys(data).filter(key => !processedFields.includes(key));
 if (remainingFields.length > 0)
  errors.push(new Error(`Unknown parameter(s): ${remainingFields.join(', ')}`));

 return errors;
}

if (data.errors) {
 var clientErrors = data.errors.map(function (e) {
  return e.description + ' (code: ' + e.code + (e.parameter ? ', parameter: ' + e.parameter : '') + ')';
 });
 error = new Error('api error(s): ' + clientErrors.join(', '));
 error.statusCode = response.statusCode;
 error.errors = data.errors;
 data = null;