Method warn

packages/utilities/src/logger.ts:30–32

(json: object)

    this.info(json);
  }
  warn(json: object): void {
    this.logger.warn(this.prefix + util.format('%j', json));
  }
  debug(json: object): void {
    this.logger.debug(this.prefix + util.format('%j', json));
  }