feat(server-ts): utils/dates → TypeScript (.mts); utils/ dir now TS (Phase 2)

dates.mts (ESM, typed) joins money.mts — the two most-required server
leaves are now TypeScript. Added .cts to the server tsconfig for the
CJS-module migration path. typecheck:server clean; suite 225 + probe 17/17.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

routes/bills.js

@@ -22,7 +22,7 @@ const {
   accountingActiveSql,
   applyBankPaymentAsSourceOfTruth,
 } = require('../services/paymentAccountingService');
-const { localDateString, todayLocal } = require('../utils/dates');
+const { localDateString, todayLocal } = require('../utils/dates.mts');
 const { roundMoney, sumMoney, toCents, fromCents } = require('../utils/money.mts');
 
 // ── GET /api/bills ────────────────────────────────────────────────────────────

routes/calendar.js

@@ -13,7 +13,7 @@ const {
   regenerateToken,
   revokeToken,
 } = require('../services/calendarFeedService');
-const { localDateString } = require('../utils/dates');
+const { localDateString } = require('../utils/dates.mts');
 const { roundMoney, sumMoney, fromCents } = require('../utils/money.mts');
 
 function clampDay(year, month, day) {

routes/matches.js

@@ -9,7 +9,7 @@ const {
 const { learnMerchantRuleFromMatch } = require('../services/billMerchantRuleService');
 const { markMatched, markUnmatched } = require('../services/transactionMatchState');
 const { serializePayment } = require('../services/paymentValidation');
-const { todayLocal } = require('../utils/dates');
+const { todayLocal } = require('../utils/dates.mts');
 
 function sendMatchError(res, err, fallbackMessage = 'Match operation failed') {
   if (err.status) {

routes/payments.js

@@ -10,7 +10,7 @@ const {
   markProvisionalManualPaymentsOverridden,
   reactivatePaymentsOverriddenBy,
 } = require('../services/paymentAccountingService');
-const { todayLocal } = require('../utils/dates');
+const { todayLocal } = require('../utils/dates.mts');
 const { fromCents } = require('../utils/money.mts');
 
 // SQL_NOT_DELETED is a compile-time constant SQL fragment, never user-supplied.

routes/status.js

@@ -10,7 +10,7 @@ const { checkForUpdates } = require('../services/updateCheckService');
 const { getStatus: getBankSyncWorkerStatus } = require('../services/bankSyncWorker');
 const { getBankSyncConfig } = require('../services/bankSyncConfigService');
 const { accountingActiveSql } = require('../services/paymentAccountingService');
-const { localDateString } = require('../utils/dates');
+const { localDateString } = require('../utils/dates.mts');
 
 const startTime = Date.now();
 let pkg;

routes/transactions.js

@@ -22,7 +22,7 @@ const {
   findOrCreateCategory,
 } = require('../services/merchantStoreMatchService');
 const { categorizeTransaction } = require('../services/spendingService');
-const { todayLocal } = require('../utils/dates');
+const { todayLocal } = require('../utils/dates.mts');
 const { roundMoney } = require('../utils/money.mts');
 
 const MATCH_STATUSES = new Set(['unmatched', 'matched', 'ignored']);

services/billMerchantRuleService.js

@@ -3,7 +3,7 @@
 const { normalizeMerchant } = require('./subscriptionService');
 const { getUserSettings } = require('./userSettings');
 const { applyBankPaymentAsSourceOfTruth } = require('./paymentAccountingService');
-const { localDateString } = require('../utils/dates');
+const { localDateString } = require('../utils/dates.mts');
 const { fromCents } = require('../utils/money.mts');
 
 // Word-boundary merchant match — requires the rule to appear as complete word(s)

services/billsService.js

@@ -1,4 +1,4 @@
-const { monthKey } = require('../utils/dates');
+const { monthKey } = require('../utils/dates.mts');
 const { toCents, fromCents } = require('../utils/money.mts');
 const VALID_VISIBILITY = ['default', 'all', 'ranges', 'none'];
 

services/driftService.js

@@ -4,7 +4,7 @@ const { getDb } = require('../db/database');
 const { getCycleRange } = require('./statusService');
 const { accountingActiveSql } = require('./paymentAccountingService');
 const { getUserSettings } = require('./userSettings');
-const { localDateString } = require('../utils/dates');
+const { localDateString } = require('../utils/dates.mts');
 const { roundMoney, fromCents } = require('../utils/money.mts');
 
 const MONTHS_BACK  = 3;

services/notificationService.js

@@ -7,7 +7,7 @@ const {
   markNotificationSuccess,
   markNotificationTestSuccess,
 } = require('./statusRuntime');
-const { localDateString } = require('../utils/dates');
+const { localDateString } = require('../utils/dates.mts');
 const { fromCents } = require('../utils/money.mts');
 
 // ── Push notification channels ────────────────────────────────────────────────

services/spendingService.js

@@ -1,7 +1,7 @@
 'use strict';
 
 const { normalizeMerchant } = require('./subscriptionService');
-const { localDateString } = require('../utils/dates');
+const { localDateString } = require('../utils/dates.mts');
 const { toCents, fromCents } = require('../utils/money.mts');
 
 // Spending = unmatched outflows (amount < 0) that haven't been ignored.

services/subscriptionService.js

@@ -1,7 +1,7 @@
 'use strict';
 
 const { billingCycleForCycleType, insertBill, validateBillData } = require('./billsService');
-const { localDateString, todayLocal } = require('../utils/dates');
+const { localDateString, todayLocal } = require('../utils/dates.mts');
 const { roundMoney, sumMoney, mulMoney, fromCents } = require('../utils/money.mts');
 
 const SUBSCRIPTION_TYPES = [

services/trackerService.js

@@ -7,7 +7,7 @@ const { computeBalanceDelta, applyBalanceDelta } = require('./billsService');
 const { computeAmountSuggestionsBatch } = require('./amountSuggestionService');
 const { accountingActiveSql } = require('./paymentAccountingService');
 const { normalizeMerchant } = require('./subscriptionService');
-const { localDateString } = require('../utils/dates');
+const { localDateString } = require('../utils/dates.mts');
 const { sumMoney, roundMoney, fromCents } = require('../utils/money.mts');
 
 const DEFAULT_PENDING_DAYS = 3;

tsconfig.server.json

@@ -16,12 +16,12 @@
     "types": ["node"]
   },
   "include": [
-    "utils/**/*.ts", "utils/**/*.mts",
+    "utils/**/*.ts", "utils/**/*.mts", "utils/**/*.cts",
-    "services/**/*.ts", "services/**/*.mts",
+    "services/**/*.ts", "services/**/*.mts", "services/**/*.cts",
-    "routes/**/*.ts", "routes/**/*.mts",
+    "routes/**/*.ts", "routes/**/*.mts", "routes/**/*.cts",
-    "middleware/**/*.ts", "middleware/**/*.mts",
+    "middleware/**/*.ts", "middleware/**/*.mts", "middleware/**/*.cts",
-    "db/**/*.ts", "db/**/*.mts",
+    "db/**/*.ts", "db/**/*.mts", "db/**/*.cts",
-    "workers/**/*.ts", "workers/**/*.mts",
+    "workers/**/*.ts", "workers/**/*.mts", "workers/**/*.cts",
-    "server.mts"
+    "server.mts", "server.cts"
   ]
 }

utils/dates.mts

@@ -1,17 +1,15 @@
-'use strict';
-
 /**
  * Server-side local-date helpers.
  *
  * Bill due dates and payment dates are stored as plain YYYY-MM-DD strings in
  * the server's local timezone (the client computes "today" the same way in
- * client/pages/TrackerPage.jsx → localDateString). Never derive a calendar
+ * client/pages/TrackerPage.tsx → localDateString). Never derive a calendar
  * date from Date.toISOString() — that yields the UTC date, which disagrees
  * with local time around midnight and month boundaries.
  */
 
 /** YYYY-MM-DD in local time. */
-function localDateString(date = new Date()) {
+export function localDateString(date: Date = new Date()): string {
   const year = date.getFullYear();
   const month = String(date.getMonth() + 1).padStart(2, '0');
   const day = String(date.getDate()).padStart(2, '0');
@@ -19,25 +17,23 @@ function localDateString(date = new Date()) {
 }
 
 /** { year, month } (1-based month) in local time. */
-function localYearMonth(date = new Date()) {
+export function localYearMonth(date: Date = new Date()): { year: number; month: number } {
   return { year: date.getFullYear(), month: date.getMonth() + 1 };
 }
 
 /** YYYY-MM-DD in local time, `days` days before `from`. */
-function localDateStringDaysAgo(days, from = new Date()) {
+export function localDateStringDaysAgo(days: number, from: Date = new Date()): string {
   const d = new Date(from);
   d.setDate(d.getDate() - days);
   return localDateString(d);
 }
 
 /** Today as YYYY-MM-DD in local time. Alias of localDateString(). */
-function todayLocal() {
+export function todayLocal(): string {
   return localDateString(new Date());
 }
 
 /** YYYY-MM month key in local time (e.g. "2026-06"). */
-function monthKey(date = new Date()) {
+export function monthKey(date: Date = new Date()): string {
   return `${date.getFullYear()}-${String(date.getMonth() + 1).padStart(2, '0')}`;
 }
-
-module.exports = { localDateString, localYearMonth, localDateStringDaysAgo, todayLocal, monthKey };

workers/dailyWorker.js

@@ -12,7 +12,7 @@ const {
   markWorkerStarted,
   markWorkerSuccess,
 } = require('../services/statusRuntime');
-const { localDateString, localDateStringDaysAgo } = require('../utils/dates');
+const { localDateString, localDateStringDaysAgo } = require('../utils/dates.mts');
 
 const DAILY_CRON_HOUR = 6;