fix: Update ru, uk, cs locale to support relativeTime with plural

src/locale/cs.js

@@ -1,5 +1,52 @@
 import dayjs from 'dayjs'
 
+function plural(n) {
+  return (n > 1) && (n < 5) && (~~(n / 10) !== 1) // eslint-disable-line
+}
+/* eslint-disable */ 
+function translate(number, withoutSuffix, key, isFuture) {
+  const result = `${number} `
+  switch (key) {
+    case 's': // a few seconds / in a few seconds / a few seconds ago
+      return (withoutSuffix || isFuture) ? 'pár sekund' : 'pár sekundami'
+    case 'm': // a minute / in a minute / a minute ago
+      return withoutSuffix ? 'minuta' : (isFuture ? 'minutu' : 'minutou')
+    case 'mm': // 9 minutes / in 9 minutes / 9 minutes ago
+      if (withoutSuffix || isFuture) {
+        return result + (plural(number) ? 'minuty' : 'minut')
+      }
+      return `${result}minutami`
+    case 'h': // an hour / in an hour / an hour ago
+      return withoutSuffix ? 'hodina' : (isFuture ? 'hodinu' : 'hodinou')
+    case 'hh': // 9 hours / in 9 hours / 9 hours ago
+      if (withoutSuffix || isFuture) {
+        return result + (plural(number) ? 'hodiny' : 'hodin')
+      }
+      return `${result}hodinami`
+    case 'd': // a day / in a day / a day ago
+      return (withoutSuffix || isFuture) ? 'den' : 'dnem'
+    case 'dd': // 9 days / in 9 days / 9 days ago
+      if (withoutSuffix || isFuture) {
+        return result + (plural(number) ? 'dny' : 'dní')
+      }
+      return `${result}dny`
+    case 'M': // a month / in a month / a month ago
+      return (withoutSuffix || isFuture) ? 'měsíc' : 'měsícem'
+    case 'MM': // 9 months / in 9 months / 9 months ago
+      if (withoutSuffix || isFuture) {
+        return result + (plural(number) ? 'měsíce' : 'měsíců')
+      }
+      return `${result}měsíci`
+    case 'y': // a year / in a year / a year ago
+      return (withoutSuffix || isFuture) ? 'rok' : 'rokem'
+    case 'yy': // 9 years / in 9 years / 9 years ago
+      if (withoutSuffix || isFuture) {
+        return result + (plural(number) ? 'roky' : 'let')
+      }
+      return `${result}lety`
+  }
+}
+/* eslint-enable */
 const locale = {
   name: 'cs',
   weekdays: 'neděle_pondělí_úterý_středa_čtvrtek_pátek_sobota'.split('_'),
@@ -21,17 +68,17 @@ const locale = {
   relativeTime: {
     future: 'za %s',
     past: 'před %s',
-    s: 'několik sekund',
-    m: 'minuta',
-    mm: '%d minut',
-    h: 'hodina',
-    hh: '%d hodin',
-    d: 'den',
-    dd: '%d dnů',
-    M: 'měsíc',
-    MM: '%d měsíců',
-    y: 'rok',
-    yy: '%d roků'
+    s: translate,
+    m: translate,
+    mm: translate,
+    h: translate,
+    hh: translate,
+    d: translate,
+    dd: translate,
+    M: translate,
+    MM: translate,
+    y: translate,
+    yy: translate
   }
 }
 

test/locale/cs.test.js

@@ -0,0 +1,52 @@
+import moment from 'moment'
+import MockDate from 'mockdate'
+import dayjs from '../../src'
+import relativeTime from '../../src/plugin/relativeTime'
+import '../../src/locale/cs'
+
+dayjs.extend(relativeTime)
+
+beforeEach(() => {
+  MockDate.set(new Date())
+})
+
+afterEach(() => {
+  MockDate.reset()
+})
+
+it('RelativeTime: Time from X', () => {
+  const T = [
+    [44.4, 'second'], // a few seconds
+    [89.5, 'second'], // a minute
+    [2, 'minute'], // 2 minutes
+    [43, 'minute'], // 44 minutes
+    [45, 'minute'], // an hour
+    [3, 'hour'], // 3 hours
+    [21, 'hour'], // 21 hours
+    [1, 'day'], // a day
+    [3, 'day'], // 3 day
+    [25, 'day'], // 25 days
+    [1, 'month'], // a month
+    [2, 'month'], // 2 month
+    [10, 'month'], // 10 month
+    [1, 'year'], // a year
+    [2, 'year'], // 2 year
+    [5, 'year'], // 5 year
+    [18, 'month'] // 2 years
+  ]
+
+  T.forEach((t) => {
+    dayjs.locale('cs')
+    moment.locale('cs')
+    const dayjsDay = dayjs()
+    const momentDay = moment()
+    const dayjsCompare = dayjs().add(t[0], t[1])
+    const momentCompare = moment().add(t[0], t[1])
+    expect(dayjsDay.from(dayjsCompare))
+      .toBe(momentDay.from(momentCompare))
+    expect(dayjsDay.to(dayjsCompare))
+      .toBe(momentDay.to(momentCompare))
+    expect(dayjsDay.from(dayjsCompare, true))
+      .toBe(momentDay.from(momentCompare, true))
+  })
+})

test/plugin/relativeTime.test.js

@@ -51,7 +51,7 @@ it('Time from X', () => {
     [1, 'month'], // a month
     [45, 'day'], // a month
     [47, 'day'], // 2 month
-    [10, 'month'], // 2 month
+    [10, 'month'], // 10 month
     [11, 'month'], // a year
     [1, 'year'], // a year
     [17, 'month'], // a year