Playing with TypeScript Generics

GossipService.ts

class GossipService {
  gossip(message: string) {
    console.log(message.toLowerCase());
  }
}

export default GossipService;

index.ts

import serviceLocator from './ServiceLocator';
import ScreamService from './ScreamService';
import GossipService from './GossipService';

serviceLocator.register('ScreamService', new ScreamService());
serviceLocator.register('GossipService', new GossipService());

const screamService = serviceLocator.get<ScreamService>('ScreamService');
screamService.scream('I like yelling');

const gossipService = serviceLocator.get<GossipService>('GossipService');
gossipService.gossip('I PREFER GOSSIPING');

ScreamService.ts

class ScreamService {
  scream(message: string) {
    console.error(message.toUpperCase());
  }
}

export default ScreamService;

ServiceLocator.ts

class ServiceLocator {
  private dependencyMap = {};

  clear() {
    this.dependencyMap = {};
  }

  get<T>(dependencyName): T {
    return this.dependencyMap[dependencyName];
  }

  register<T>(dependencyName, constructor: T) {
    this.dependencyMap[dependencyName] = constructor;
  }
}

const serviceLocator = new ServiceLocator();

export default serviceLocator;