setup.ts

  monaco.languages.onLanguage(languageID, () => {
        monaco.languages.setMonarchTokensProvider(languageID, monarchLanguage);
        monaco.languages.setLanguageConfiguration(languageID, richLanguageConfiguration);
        const client = new WorkerManager();

        const worker: WorkerAccessor = (...uris: monaco.Uri[]): Promise<TodoLangWorker> => {
            return client.getLanguageServiceWorker(...uris);
        };
        //Call the errors provider
        new DiagnosticsAdapter(worker);
    });

}

export type WorkerAccessor = (...uris: monaco.Uri[]) => Promise<TodoLangWorker>;