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import * as mongoose from 'mongoose';
/** * gh-issue #11367 * * @see https://github.com/Automattic/mongoose/issues/11367 */function handleValidationError(err: mongoose.Error.ValidationError): Array<string> {  const errorTypes = Object.keys(err.errors).map((field: string) => err.errors[field].kind);  return errorTypes;}
/** * gh-issue #11838 * * @see https://github.com/Automattic/mongoose/issues/11838 */function gh11838() {  const Model = mongoose.model('Test', new mongoose.Schema({ answer: Number }));  const doc = new Model({ answer: 'not a number' });  const err = doc.validateSync();
  err instanceof mongoose.Error;  err instanceof mongoose.MongooseError;  err instanceof mongoose.Error.ValidationError;}