export abstract class Entry {
  public timestamp;

  protected constructor() {
    this.timestamp = new Date();
  }
}

export class SystemMessage extends Entry {

  constructor(public message: string,
              public severity: SeverityEnum) {
    super();
  }

  public get type(): string {
    return 'system'
  }
}

export enum SeverityEnum {
  info = 'info',
  warning = 'warning',
  error = 'error',
}