abstract class BaseClass {
  /**
   * Useful description always applicable
   * 
   * @returns {string} Useful description of return value always applicable.
   */
  public static doSomethingUseful(stuff?: any): string {
    throw new Error('Must be implemented by subclass');
  }

  /**
   * Applicable description always.
   */
  public static readonly someProperty: string = 'general value';
}




class SubClass extends BaseClass {

  /**
   * @inheritDoc
   * 
   * @param {{ tiger: string; lion: string; }} [mySpecificStuff] Description of my specific parameter.
   */
  public static doSomethingUseful(mySpecificStuff?: { tiger: string; lion: string; }): string {
    let useful = '';

    // do something useful to useful

    return useful;
  }

  /**
   * @inheritDoc
   */
  public static readonly someProperty: string = 'specific to this class value'
}