src observer.ts

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  import { ObservableInterface, ObserverInterface } from "jga-patterns-observer";
 
import { ConsoleInterface } from "jga-games-console";
 
export class ScreenObserver implements ObserverInterface {
    private readonly console: ConsoleInterface;
 
    public constructor(console: ConsoleInterface) {
        this.console = console;
    }
 
    public update(subject: ObservableInterface, message: string): void {
        this.console.append(`[${subject.constructor.name}] ${message}`);
    }
}