src/vs/editor/common/languages/languageConfigurationRegistry.ts/ComposedLanguageConfiguration/_resolve
class ComposedLanguageConfiguration:	private _resolve(): LanguageConfiguration | null {
		if (this._entries.length === 0) {
			return null;
		}
		this._entries.sort(LanguageConfigurationContribution.cmp);
		return combineLanguageConfigurations(this._entries.map(e => e.configuration));
	}