src/vs/platform/configuration/common/configurations.ts/DefaultConfiguration/initialize
class DefaultConfiguration:	async initialize(): Promise<ConfigurationModel> {
		this._configurationModel = undefined;
		this._register(Registry.as<IConfigurationRegistry>(Extensions.Configuration).onDidUpdateConfiguration(({ properties, defaultsOverrides }) => this.onDidUpdateConfiguration(properties, defaultsOverrides)));
		return this.configurationModel;
	}