converse-built/node_modules/deprecation/dist-web/index.js

class Deprecation extends Error {
  constructor(message) {
    super(message); // Maintains proper stack trace (only available on V8)

    /* istanbul ignore next */

    if (Error.captureStackTrace) {
      Error.captureStackTrace(this, this.constructor);
    }

    this.name = 'Deprecation';
  }

}

export { Deprecation };