src/vs/platform/instantiation/common/instantiationService.ts/InstantiationService/constructor
class InstantiationService:	constructor(
		private readonly _services: ServiceCollection = new ServiceCollection(),
		private readonly _strict: boolean = false,
		private readonly _parent?: InstantiationService,
		private readonly _enableTracing: boolean = _enableAllTracing
	) {

		this._services.set(IInstantiationService, this);
		this._globalGraph = _enableTracing ? _parent?._globalGraph ?? new Graph(e => e) : undefined;
	}