chore: fix types and lint errors

examples/index.mjs

@@ -10,27 +10,30 @@ const now = new Date();
 
 // With function
 {
+  /** @param {import('lit-date').DateProxy} param */
   const monthName = ({ month }) =>
     ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'][month - 1];
+  /** @param {import('lit-date').DateProxy} param */
   const dayWithSuffix = ({ day }) => {
     if (Math.floor(day / 10) !== 1) {
       switch (day % 10) {
         case 1:
-          return `${day}st`;
+          return `${day.toString(10)}st`;
         case 2:
-          return `${day}nd`;
+          return `${day.toString(10)}nd`;
         case 3:
-          return `${day}rd`;
+          return `${day.toString(10)}rd`;
       }
     }
-    return `${day}th`;
+    return `${day.toString(10)}th`;
   };
   const format = litdate`${monthName} ${dayWithSuffix}, ${'YYYY'}`;
   console.log(format(now));
 }
 
 // Intl
 {
+  /** @param {import('lit-date').DateProxy} param */
   const dayOfWeekName = ({ dayOfWeek }) => ['日', '月', '火', '水', '木', '金', '土'][dayOfWeek];
   const format = litdate`${'M'}月${'D'}日${dayOfWeekName}曜日`;
   console.log(format(now));

src/DateProxy.ts

@@ -1,4 +1,4 @@
-const pad = (num: number, count = 2) => `${num}`.padStart(count, '0');
+const pad = (num: number, count = 2) => num.toString(10).padStart(count, '0');
 
 class DateProxy {
   private _date: Date;

src/__tests__/test.spec.ts

@@ -1,8 +1,12 @@
-import { expect, test } from '@jest/globals';
+import { afterEach, expect, jest, test } from '@jest/globals';
 
 import type { DateProxy } from '../';
 import fdate from '../';
 
+afterEach(() => {
+  jest.restoreAllMocks();
+});
+
 test('year', () => {
   const date = new Date('2019-05-07T00:00:00.000');
   expect(fdate`${'year'}`(date)).toBe('2019');
@@ -100,30 +104,25 @@ test('milliSecond', () => {
 });
 
 test('TimeZone', () => {
-  const getTimezoneOffset = Date.prototype.getTimezoneOffset;
-  try {
-    const date = new Date();
-    Date.prototype.getTimezoneOffset = () => -540;
-    expect(fdate`${'Z'}`(date)).toBe('+09:00');
-    expect(fdate`${'ZZ'}`(date)).toBe('+0900');
-
-    Date.prototype.getTimezoneOffset = () => +660;
-    expect(fdate`${'Z'}`(date)).toBe('-11:00');
-    expect(fdate`${'ZZ'}`(date)).toBe('-1100');
-
-    Date.prototype.getTimezoneOffset = () => 0;
-    expect(fdate`${'Z'}`(date)).toBe('Z');
-    expect(fdate`${'ZZ'}`(date)).toBe('Z');
-  } finally {
-    Date.prototype.getTimezoneOffset = getTimezoneOffset;
-  }
+  const date = new Date();
+  jest.spyOn(Date.prototype, 'getTimezoneOffset').mockReturnValue(-540);
+  expect(fdate`${'Z'}`(date)).toBe('+09:00');
+  expect(fdate`${'ZZ'}`(date)).toBe('+0900');
+
+  jest.spyOn(Date.prototype, 'getTimezoneOffset').mockReturnValue(+660);
+  expect(fdate`${'Z'}`(date)).toBe('-11:00');
+  expect(fdate`${'ZZ'}`(date)).toBe('-1100');
+
+  jest.spyOn(Date.prototype, 'getTimezoneOffset').mockReturnValue(0);
+  expect(fdate`${'Z'}`(date)).toBe('Z');
+  expect(fdate`${'ZZ'}`(date)).toBe('Z');
 });
 
 test('i18n', () => {
   const date = new Date('2019-02-25T00:00:00.000');
   const era = ({ year }: DateProxy) => {
     const eraYear = year - 1988;
-    return eraYear === 1 ? '平成元年' : `平成${year - 1988}`;
+    return eraYear === 1 ? '平成元年' : `平成${(year - 1988).toString(10)}`;
   };
   const dayOfWeek = ({ dayOfWeek }: DateProxy) => '日月火水木金土'[dayOfWeek];
   expect(fdate`${era}年${'M'}月${'D'}日（${dayOfWeek}）`(date)).toBe('平成31年2月25日（月）');

src/string-raw.ts

@@ -6,8 +6,10 @@ const loosePolyfill = (callSite: TemplateStringsArray, ...substitutions: any[])
   const raw = callSite.raw;
   const length = raw.length - 1;
   for (let idx = 0; idx < length; idx++) {
+    // eslint-disable-next-line @typescript-eslint/restrict-plus-operands
     t += raw[idx] + substitutions[idx];
   }
+  // eslint-disable-next-line @typescript-eslint/restrict-plus-operands
   return t + raw[length];
 };