src/vs/editor/common/services/languagesRegistry.ts/LanguagesRegistry/getConfigurationFiles
class LanguagesRegistry:	public getConfigurationFiles(languageId: string): ReadonlyArray<URI> {
		if (!hasOwnProperty.call(this._languages, languageId)) {
			return [];
		}
		return this._languages[languageId].configurationFiles || [];
	}