src/vs/platform/configuration/common/configurationRegistry.ts/ConfigurationRegistry/doRegisterConfigurations
class ConfigurationRegistry:	private doRegisterConfigurations(configurations: IConfigurationNode[], validate: boolean): string[] {
		const properties: string[] = [];
		configurations.forEach(configuration => {
			properties.push(...this.validateAndRegisterProperties(configuration, validate, configuration.extensionInfo, configuration.restrictedProperties)); // fills in defaults
			this.configurationContributors.push(configuration);
			this.registerJSONConfiguration(configuration);
		});
		return properties;
	}