SPFxDependenciesManagerV1.ts

export class DependenciesManager {
    private serviceScope: ServiceScope;

	public configure(
		rootServiceScope: ServiceScope,
		serviceScopeConfiguration: (rootServiceScope: ServiceScope) => Promise<ServiceScope>
	): Promise<any> {
		return new Promise((resolve, reject) => {
			serviceScopeConfiguration(rootServiceScope)
				.then((usedScope) => {
          this.serviceScope = usedScope;
					resolve();
				})
				.catch((error) => {
					reject(error);
				});
		});
	}

	public inject<TService>(serviceKey: ServiceKey<TService>): TService {
		if (this.serviceScope) {
			return this.serviceScope.consume(serviceKey);
		} else {
      return null;
    }
	}
}

const Dependencies: DependenciesManager = new DependenciesManager();
export default Dependencies;