src/vs/platform/configuration/common/configurationRegistry.ts/ConfigurationRegistry/constructor
class ConfigurationRegistry:	constructor() {
		this.configurationDefaultsOverrides = new Map<string, IConfigurationDefaultOverride>();
		this.defaultLanguageConfigurationOverridesNode = {
			id: 'defaultOverrides',
			title: nls.localize('defaultLanguageConfigurationOverrides.title', "Default Language Configuration Overrides"),
			properties: {}
		};
		this.configurationContributors = [this.defaultLanguageConfigurationOverridesNode];
		this.resourceLanguageSettingsSchema = { properties: {}, patternProperties: {}, additionalProperties: false, errorMessage: 'Unknown editor configuration setting', allowTrailingCommas: true, allowComments: true };
		this.configurationProperties = {};
		this.excludedConfigurationProperties = {};

		contributionRegistry.registerSchema(resourceLanguageSettingsSchemaId, this.resourceLanguageSettingsSchema);
		this.registerOverridePropertyPatternKey();
	}