ci: fix eslint config, add missing ts-eslint devDeps, format src

- Add @typescript-eslint/parser and @typescript-eslint/eslint-plugin to
  devDependencies (required by eslint.config.mjs direct imports and by
  @acamarata/eslint-config peerDependencies)
- Fix eslint.config.mjs: scope files to src/**/*.ts, add parserOptions.project
  for type-aware rules, expand ignores to cover coverage/ and docs/
- Run prettier --write src/ to fix format:check failures

eslint.config.mjs

@@ -5,12 +5,19 @@ import { typescript } from '@acamarata/eslint-config';
 
 export default [
   {
-    plugins: { '@typescript-eslint': tsPlugin },
-    languageOptions: { parser: tsParser },
+    ignores: ['dist/**', 'node_modules/**', 'coverage/**', 'docs/**'],
   },
-  ...typescript,
-  eslintConfigPrettier,
   {
-    ignores: ['dist/', 'node_modules/', '*.cjs', '*.mjs'],
+    files: ['src/**/*.ts'],
+    plugins: { '@typescript-eslint': tsPlugin },
+    languageOptions: {
+      parser: tsParser,
+      parserOptions: {
+        project: './tsconfig.json',
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
   },
+  ...typescript.map((cfg) => ({ ...cfg, files: ['src/**/*.ts'] })),
+  eslintConfigPrettier,
 ];

package.json

@@ -60,6 +60,8 @@
     "@acamarata/tsconfig": "^0.1.0",
     "@eslint/js": "^10.0.1",
     "@types/node": "^22.15.0",
+    "@typescript-eslint/eslint-plugin": "^8.56.1",
+    "@typescript-eslint/parser": "^8.56.1",
     "c8": "^10.1.0",
     "eslint": "^10.0.3",
     "eslint-config-prettier": "^10.1.8",

pnpm-lock.yaml

@@ -23,6 +23,12 @@ importers:
       '@types/node':
         specifier: ^22.15.0
         version: 22.15.0
+      '@typescript-eslint/eslint-plugin':
+        specifier: ^8.56.1
+        version: 8.56.1(@typescript-eslint/parser@8.56.1(eslint@10.0.3)(typescript@5.9.3))(eslint@10.0.3)(typescript@5.9.3)
+      '@typescript-eslint/parser':
+        specifier: ^8.56.1
+        version: 8.56.1(eslint@10.0.3)(typescript@5.9.3)
       c8:
         specifier: ^10.1.0
         version: 10.1.3

src/data/hDates.ts

@@ -1,4 +1,4 @@
-import type { HijriYearRecord } from '../types';
+import type { HijriYearRecord } from "../types";
 
 // Umm al-Qura reference table: Hijri years 1318-1501.
 // Each entry records the 1 Muharram Gregorian date and a 12-bit days-per-month

src/engines/fcna.ts

@@ -7,9 +7,9 @@
 // New moon times come from Jean Meeus, Astronomical Algorithms (2nd ed.),
 // Chapter 49, accurate to within a few minutes for 1000-3000 CE.
 
-import { hDatesTable } from '../data/hDates';
-import { MS_PER_DAY, MONTHS_PER_YEAR } from '../constants';
-import type { CalendarEngine, HijriDate } from '../types';
+import { hDatesTable } from "../data/hDates";
+import { MS_PER_DAY, MONTHS_PER_YEAR } from "../constants";
+import type { CalendarEngine, HijriDate } from "../types";
 
 // ─── Constants ───────────────────────────────────────────────────────────────
 
@@ -211,7 +211,7 @@ function fcnaDaysInMonth(hy: number, hm: number): number {
 
 function fcnaToHijri(gregorianDate: Date): HijriDate | null {
   if (!(gregorianDate instanceof Date) || isNaN(gregorianDate.getTime())) {
-    throw new Error('Invalid Gregorian date');
+    throw new Error("Invalid Gregorian date");
   }
 
   // FCNA criterion is UTC-based, so UTC date components ensure correct round-trips.
@@ -271,7 +271,7 @@ function fcnaIsValid(hy: number, hm: number, hd: number): boolean {
 // ─── Engine export ────────────────────────────────────────────────────────────
 
 export const fcnaEngine: CalendarEngine = {
-  id: 'fcna',
+  id: "fcna",
   toHijri: fcnaToHijri,
   toGregorian: fcnaToGregorian,
   isValid: fcnaIsValid,

src/engines/uaq.ts

@@ -4,9 +4,9 @@
 // (Gregorian 1900-2076). Each entry records the Gregorian date of 1 Muharram and
 // a 12-bit days-per-month bitmask. Dates outside that window return null.
 
-import { hDatesTable } from '../data/hDates';
-import { MS_PER_DAY, MONTHS_PER_YEAR } from '../constants';
-import type { CalendarEngine, HijriDate, HijriYearRecord } from '../types';
+import { hDatesTable } from "../data/hDates";
+import { MS_PER_DAY, MONTHS_PER_YEAR } from "../constants";
+import type { CalendarEngine, HijriDate, HijriYearRecord } from "../types";
 
 /**
  * Binary search for a Hijri year entry in the UAQ table.
@@ -38,7 +38,7 @@ function findYearEntry(hy: number): HijriYearRecord | null {
 // the calendar-date lookup is timezone-safe regardless of the host environment.
 function uaqToHijri(date: Date): HijriDate | null {
   if (!(date instanceof Date) || isNaN(date.getTime())) {
-    throw new Error('Invalid Gregorian date');
+    throw new Error("Invalid Gregorian date");
   }
 
   const inputUtc = Date.UTC(date.getFullYear(), date.getMonth(), date.getDate());
@@ -126,7 +126,7 @@ function uaqDaysInMonth(hy: number, hm: number): number {
 }
 
 export const uaqEngine: CalendarEngine = {
-  id: 'uaq',
+  id: "uaq",
   toHijri: uaqToHijri,
   toGregorian: uaqToGregorian,
   isValid: uaqIsValid,

src/index.ts

@@ -1,32 +1,32 @@
 // Built-in engines are registered at module load so that 'uaq' and 'fcna' are
 // available immediately on import. This module-level side effect is intentional
 // and documented in the sideEffects field of package.json.
-import { uaqEngine } from './engines/uaq';
-import { fcnaEngine } from './engines/fcna';
-import { registerCalendar } from './registry';
+import { uaqEngine } from "./engines/uaq";
+import { fcnaEngine } from "./engines/fcna";
+import { registerCalendar } from "./registry";
 
-registerCalendar('uaq', uaqEngine);
-registerCalendar('fcna', fcnaEngine);
+registerCalendar("uaq", uaqEngine);
+registerCalendar("fcna", fcnaEngine);
 
 // Registry
-export { registerCalendar, getCalendar, listCalendars } from './registry';
+export { registerCalendar, getCalendar, listCalendars } from "./registry";
 
 // Constants
-export { MS_PER_DAY, MONTHS_PER_YEAR } from './constants';
+export { MS_PER_DAY, MONTHS_PER_YEAR } from "./constants";
 
 // Types
-export type { HijriDate, HijriYearRecord, CalendarEngine, ConversionOptions } from './types';
+export type { HijriDate, HijriYearRecord, CalendarEngine, ConversionOptions } from "./types";
 
 // Data
-export { hDatesTable } from './data/hDates';
+export { hDatesTable } from "./data/hDates";
 
 // Names
-export { hmLong, hmMedium, hmShort } from './names/months';
-export { hwLong, hwShort, hwNumeric } from './names/weekdays';
+export { hmLong, hmMedium, hmShort } from "./names/months";
+export { hwLong, hwShort, hwNumeric } from "./names/weekdays";
 
 // Convenience wrappers
-import { getCalendar } from './registry';
-import type { HijriDate, ConversionOptions } from './types';
+import { getCalendar } from "./registry";
+import type { HijriDate, ConversionOptions } from "./types";
 
 /**
  * Convert a Gregorian date to a Hijri date.
@@ -41,9 +41,9 @@ import type { HijriDate, ConversionOptions } from './types';
  */
 export function toHijri(date: Date, options?: ConversionOptions): HijriDate | null {
   if (!(date instanceof Date) || isNaN(date.getTime())) {
-    throw new Error('Invalid Gregorian date');
+    throw new Error("Invalid Gregorian date");
   }
-  return getCalendar(options?.calendar ?? 'uaq').toHijri(date);
+  return getCalendar(options?.calendar ?? "uaq").toHijri(date);
 }
 
 /**
@@ -63,7 +63,7 @@ export function toGregorian(
   hd: number,
   options?: ConversionOptions,
 ): Date | null {
-  return getCalendar(options?.calendar ?? 'uaq').toGregorian(hy, hm, hd);
+  return getCalendar(options?.calendar ?? "uaq").toGregorian(hy, hm, hd);
 }
 
 /**
@@ -81,7 +81,7 @@ export function isValidHijriDate(
   hd: number,
   options?: ConversionOptions,
 ): boolean {
-  return getCalendar(options?.calendar ?? 'uaq').isValid(hy, hm, hd);
+  return getCalendar(options?.calendar ?? "uaq").isValid(hy, hm, hd);
 }
 
 /**
@@ -94,5 +94,5 @@ export function isValidHijriDate(
  * @throws {RangeError} if the month or year is out of range
  */
 export function daysInHijriMonth(hy: number, hm: number, options?: ConversionOptions): number {
-  return getCalendar(options?.calendar ?? 'uaq').daysInMonth(hy, hm);
+  return getCalendar(options?.calendar ?? "uaq").daysInMonth(hy, hm);
 }

src/names/months.ts

@@ -11,18 +11,18 @@
  * const month = hmLong[hijriDate.hm - 1]; // "Ramadan"
  */
 export const hmLong = [
-  'Muharram', // 1
-  'Safar', // 2
+  "Muharram", // 1
+  "Safar", // 2
   "Rabi'l Awwal", // 3
   "Rabi'l Thani", // 4
-  'Jumadal Awwal', // 5
-  'Jumadal Thani', // 6
-  'Rajab', // 7
+  "Jumadal Awwal", // 5
+  "Jumadal Thani", // 6
+  "Rajab", // 7
   "Sha'ban", // 8
-  'Ramadan', // 9
-  'Shawwal', // 10
+  "Ramadan", // 9
+  "Shawwal", // 10
   "Dhul Qi'dah", // 11
-  'Dhul Hijjah', // 12
+  "Dhul Hijjah", // 12
 ];
 
 /**
@@ -35,18 +35,18 @@ export const hmLong = [
  * const label = hmMedium[hijriDate.hm - 1]; // "Ramadan"
  */
 export const hmMedium = [
-  'Muharram',
-  'Safar',
-  'Rabi1',
-  'Rabi2',
-  'Jumada1',
-  'Jumada2',
-  'Rajab',
-  'Shaban',
-  'Ramadan',
-  'Shawwal',
-  'Dhul-Qidah',
-  'Dhul-Hijjah',
+  "Muharram",
+  "Safar",
+  "Rabi1",
+  "Rabi2",
+  "Jumada1",
+  "Jumada2",
+  "Rajab",
+  "Shaban",
+  "Ramadan",
+  "Shawwal",
+  "Dhul-Qidah",
+  "Dhul-Hijjah",
 ];
 
 /**
@@ -59,16 +59,16 @@ export const hmMedium = [
  * const abbr = hmShort[hijriDate.hm - 1]; // "Ram"
  */
 export const hmShort = [
-  'Muh',
-  'Saf',
-  'Ra1',
-  'Ra2',
-  'Ju1',
-  'Ju2',
-  'Raj',
-  'Shb',
-  'Ram',
-  'Shw',
-  'DhQ',
-  'DhH',
+  "Muh",
+  "Saf",
+  "Ra1",
+  "Ra2",
+  "Ju1",
+  "Ju2",
+  "Raj",
+  "Shb",
+  "Ram",
+  "Shw",
+  "DhQ",
+  "DhH",
 ];

src/names/weekdays.ts

@@ -11,13 +11,13 @@
  * const dayName = hwLong[gregorianDate.getDay()]; // "Yawm al-Jum`a"
  */
 export const hwLong = [
-  'Yawm al-Ahad', // Sunday
-  'Yawm al-Ithnayn', // Monday
+  "Yawm al-Ahad", // Sunday
+  "Yawm al-Ithnayn", // Monday
   "Yawm ath-Thulatha'", // Tuesday
   "Yawm al-Arba`a'", // Wednesday
-  'Yawm al-Khamis', // Thursday
-  'Yawm al-Jum`a', // Friday
-  'Yawm as-Sabt', // Saturday
+  "Yawm al-Khamis", // Thursday
+  "Yawm al-Jum`a", // Friday
+  "Yawm as-Sabt", // Saturday
 ];
 
 /**
@@ -30,13 +30,13 @@ export const hwLong = [
  * const abbr = hwShort[gregorianDate.getDay()]; // "Jum`a"
  */
 export const hwShort = [
-  'Ahad', // Sunday
-  'Ithn', // Monday
-  'Thul', // Tuesday
-  'Arba', // Wednesday
-  'Kham', // Thursday
-  'Jum`a', // Friday
-  'Sabt', // Saturday
+  "Ahad", // Sunday
+  "Ithn", // Monday
+  "Thul", // Tuesday
+  "Arba", // Wednesday
+  "Kham", // Thursday
+  "Jum`a", // Friday
+  "Sabt", // Saturday
 ];
 
 /**

src/registry.ts

@@ -1,4 +1,4 @@
-import type { CalendarEngine } from './types';
+import type { CalendarEngine } from "./types";
 
 const _engines = new Map<string, CalendarEngine>();
 
@@ -25,7 +25,7 @@ export function registerCalendar(name: string, engine: CalendarEngine): void {
 export function getCalendar(name: string): CalendarEngine {
   const engine = _engines.get(name);
   if (!engine) {
-    const available = listCalendars().join(', ');
+    const available = listCalendars().join(", ");
     throw new Error(
       `Unknown Hijri calendar: "${name}". Available: ${available}. Register custom calendars with registerCalendar().`,
     );