src/vs/workbench/contrib/surveys/browser/languageSurveys.contribution.ts/LanguageSurvey/constructor
class LanguageSurvey:	constructor(
		data: ISurveyData,
		storageService: IStorageService,
		notificationService: INotificationService,
		telemetryService: ITelemetryService,
		languageService: ILanguageService,
		textFileService: ITextFileService,
		openerService: IOpenerService,
		productService: IProductService
	) {
		super();

		const SESSION_COUNT_KEY = `${data.surveyId}.sessionCount`;
		const LAST_SESSION_DATE_KEY = `${data.surveyId}.lastSessionDate`;
		const SKIP_VERSION_KEY = `${data.surveyId}.skipVersion`;
		const IS_CANDIDATE_KEY = `${data.surveyId}.isCandidate`;
		const EDITED_LANGUAGE_COUNT_KEY = `${data.surveyId}.editedCount`;
		const EDITED_LANGUAGE_DATE_KEY = `${data.surveyId}.editedDate`;

		const skipVersion = storageService.get(SKIP_VERSION_KEY, StorageScope.GLOBAL, '');
		if (skipVersion) {
			return;
		}

		const date = new Date().toDateString();

		if (storageService.getNumber(EDITED_LANGUAGE_COUNT_KEY, StorageScope.GLOBAL, 0) < data.editCount) {

			// Process model-save event every 250ms to reduce load
			const onModelsSavedWorker = this._register(new RunOnceWorker<ITextFileEditorModel>(models => {
				models.forEach(m => {
					if (m.getLanguageId() === data.languageId && date !== storageService.get(EDITED_LANGUAGE_DATE_KEY, StorageScope.GLOBAL)) {
						const editedCount = storageService.getNumber(EDITED_LANGUAGE_COUNT_KEY, StorageScope.GLOBAL, 0) + 1;
						storageService.store(EDITED_LANGUAGE_COUNT_KEY, editedCount, StorageScope.GLOBAL, StorageTarget.USER);
						storageService.store(EDITED_LANGUAGE_DATE_KEY, date, StorageScope.GLOBAL, StorageTarget.USER);
					}
				});
			}, 250));

			this._register(textFileService.files.onDidSave(e => onModelsSavedWorker.work(e.model)));
		}

		const lastSessionDate = storageService.get(LAST_SESSION_DATE_KEY, StorageScope.GLOBAL, new Date(0).toDateString());
		if (date === lastSessionDate) {
			return;
		}

		const sessionCount = storageService.getNumber(SESSION_COUNT_KEY, StorageScope.GLOBAL, 0) + 1;
		storageService.store(LAST_SESSION_DATE_KEY, date, StorageScope.GLOBAL, StorageTarget.USER);
		storageService.store(SESSION_COUNT_KEY, sessionCount, StorageScope.GLOBAL, StorageTarget.USER);

		if (sessionCount < 9) {
			return;
		}

		if (storageService.getNumber(EDITED_LANGUAGE_COUNT_KEY, StorageScope.GLOBAL, 0) < data.editCount) {
			return;
		}

		const isCandidate = storageService.getBoolean(IS_CANDIDATE_KEY, StorageScope.GLOBAL, false)
			|| Math.random() < data.userProbability;

		storageService.store(IS_CANDIDATE_KEY, isCandidate, StorageScope.GLOBAL, StorageTarget.USER);

		if (!isCandidate) {
			storageService.store(SKIP_VERSION_KEY, productService.version, StorageScope.GLOBAL, StorageTarget.USER);
			return;
		}

		notificationService.prompt(
			Severity.Info,
			localize('helpUs', "Help us improve our support for {0}", languageService.getLanguageName(data.languageId) ?? data.languageId),
			[{
				label: localize('takeShortSurvey', "Take Short Survey"),
				run: () => {
					telemetryService.publicLog(`${data.surveyId}.survey/takeShortSurvey`);
					telemetryService.getTelemetryInfo().then(info => {
						openerService.open(URI.parse(`${data.surveyUrl}?o=${encodeURIComponent(platform)}&v=${encodeURIComponent(productService.version)}&m=${encodeURIComponent(info.machineId)}`));
						storageService.store(IS_CANDIDATE_KEY, false, StorageScope.GLOBAL, StorageTarget.USER);
						storageService.store(SKIP_VERSION_KEY, productService.version, StorageScope.GLOBAL, StorageTarget.USER);
					});
				}
			}, {
				label: localize('remindLater', "Remind Me later"),
				run: () => {
					telemetryService.publicLog(`${data.surveyId}.survey/remindMeLater`);
					storageService.store(SESSION_COUNT_KEY, sessionCount - 3, StorageScope.GLOBAL, StorageTarget.USER);
				}
			}, {
				label: localize('neverAgain', "Don't Show Again"),
				isSecondary: true,
				run: () => {
					telemetryService.publicLog(`${data.surveyId}.survey/dontShowAgain`);
					storageService.store(IS_CANDIDATE_KEY, false, StorageScope.GLOBAL, StorageTarget.USER);
					storageService.store(SKIP_VERSION_KEY, productService.version, StorageScope.GLOBAL, StorageTarget.USER);
				}
			}],
			{ sticky: true }
		);
	}