let staleState = { ... this.state };

    // let staleState = { ...this.state };

// class and interface merging??? https://stackoverflow.com/questions/44153378/typescript-abstract-optional-method

  fireStateUpdaters(): void { } 
  didMount(): void { }
  abstract updateSelf(nextProps: P): void
  shouldUpdate(staleProps: P, staleState: S, nextProps: P, state: S): boolean {

  protected fireStateUpdaters(): void { } 
  protected didMount(): void { }
  protected abstract updateSelf(nextProps: P): void
  protected shouldUpdate(staleProps: P, staleState: S, nextProps: P, state: S): boolean {

  updateChildren(nextProps: P) {

  protected updateChildren(nextProps: P) {

  abstract renderSelf(nextProps: P): void
  didUpdate(): void { }

  protected abstract renderSelf(nextProps: P): void
  protected didUpdate(): void { }
  protected willUnmount(): void { }

    let staleState = { ... this.state };

    // let staleState = { ...this.state };

    let staleState = { ... this.state };

    let staleState = { ...this.state };

    let staleState = { ... this.state };

    // let staleState = { ...this.state };