src/vs/editor/standalone/browser/standaloneLanguages.ts/registerImplementationProvider
export function registerImplementationProvider(languageSelector: LanguageSelector, provider: languages.ImplementationProvider): IDisposable {
	const languageFeaturesService = StandaloneServices.get(ILanguageFeaturesService);
	return languageFeaturesService.implementationProvider.register(languageSelector, provider);
}