v1.0 with SW PWA enabled

frontend/node_modules/date-fns/locale/ja/_lib/localize.mjs

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+import { buildLocalizeFn } from "../../_lib/buildLocalizeFn.mjs";
+
+const eraValues = {
+  narrow: ["BC", "AC"],
+  abbreviated: ["紀元前", "西暦"],
+  wide: ["紀元前", "西暦"],
+};
+
+const quarterValues = {
+  narrow: ["1", "2", "3", "4"],
+  abbreviated: ["Q1", "Q2", "Q3", "Q4"],
+  wide: ["第1四半期", "第2四半期", "第3四半期", "第4四半期"],
+};
+
+const monthValues = {
+  narrow: ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12"],
+
+  abbreviated: [
+    "1月",
+    "2月",
+    "3月",
+    "4月",
+    "5月",
+    "6月",
+    "7月",
+    "8月",
+    "9月",
+    "10月",
+    "11月",
+    "12月",
+  ],
+
+  wide: [
+    "1月",
+    "2月",
+    "3月",
+    "4月",
+    "5月",
+    "6月",
+    "7月",
+    "8月",
+    "9月",
+    "10月",
+    "11月",
+    "12月",
+  ],
+};
+
+const dayValues = {
+  narrow: ["日", "月", "火", "水", "木", "金", "土"],
+  short: ["日", "月", "火", "水", "木", "金", "土"],
+  abbreviated: ["日", "月", "火", "水", "木", "金", "土"],
+  wide: ["日曜日", "月曜日", "火曜日", "水曜日", "木曜日", "金曜日", "土曜日"],
+};
+
+const dayPeriodValues = {
+  narrow: {
+    am: "午前",
+    pm: "午後",
+    midnight: "深夜",
+    noon: "正午",
+    morning: "朝",
+    afternoon: "午後",
+    evening: "夜",
+    night: "深夜",
+  },
+  abbreviated: {
+    am: "午前",
+    pm: "午後",
+    midnight: "深夜",
+    noon: "正午",
+    morning: "朝",
+    afternoon: "午後",
+    evening: "夜",
+    night: "深夜",
+  },
+  wide: {
+    am: "午前",
+    pm: "午後",
+    midnight: "深夜",
+    noon: "正午",
+    morning: "朝",
+    afternoon: "午後",
+    evening: "夜",
+    night: "深夜",
+  },
+};
+const formattingDayPeriodValues = {
+  narrow: {
+    am: "午前",
+    pm: "午後",
+    midnight: "深夜",
+    noon: "正午",
+    morning: "朝",
+    afternoon: "午後",
+    evening: "夜",
+    night: "深夜",
+  },
+  abbreviated: {
+    am: "午前",
+    pm: "午後",
+    midnight: "深夜",
+    noon: "正午",
+    morning: "朝",
+    afternoon: "午後",
+    evening: "夜",
+    night: "深夜",
+  },
+  wide: {
+    am: "午前",
+    pm: "午後",
+    midnight: "深夜",
+    noon: "正午",
+    morning: "朝",
+    afternoon: "午後",
+    evening: "夜",
+    night: "深夜",
+  },
+};
+
+const ordinalNumber = (dirtyNumber, options) => {
+  const number = Number(dirtyNumber);
+  const unit = String(options?.unit);
+
+  switch (unit) {
+    case "year":
+      return `${number}年`;
+    case "quarter":
+      return `第${number}四半期`;
+    case "month":
+      return `${number}月`;
+    case "week":
+      return `第${number}週`;
+    case "date":
+      return `${number}日`;
+    case "hour":
+      return `${number}時`;
+    case "minute":
+      return `${number}分`;
+    case "second":
+      return `${number}秒`;
+    default:
+      return `${number}`;
+  }
+};
+
+export const localize = {
+  ordinalNumber: ordinalNumber,
+
+  era: buildLocalizeFn({
+    values: eraValues,
+    defaultWidth: "wide",
+  }),
+
+  quarter: buildLocalizeFn({
+    values: quarterValues,
+    defaultWidth: "wide",
+    argumentCallback: (quarter) => Number(quarter) - 1,
+  }),
+
+  month: buildLocalizeFn({
+    values: monthValues,
+    defaultWidth: "wide",
+  }),
+
+  day: buildLocalizeFn({
+    values: dayValues,
+    defaultWidth: "wide",
+  }),
+
+  dayPeriod: buildLocalizeFn({
+    values: dayPeriodValues,
+    defaultWidth: "wide",
+    formattingValues: formattingDayPeriodValues,
+    defaultFormattingWidth: "wide",
+  }),
+};