fix: Update LocaleData plugin to support dayjs.localeData().weekdays() API

fix #779

Author: iamkun

src/plugin/localeData/index.js

@@ -1,7 +1,7 @@
 export default (o, c, dayjs) => { // locale needed later
   const proto = c.prototype
   const getShort = (ins, target, full, num) => {
-    const locale = ins.$locale()
+    const locale = ins.name ? ins : ins.$locale()
     if (!locale[target]) {
       return locale[full].map(f => f.substr(0, num))
     }
@@ -28,7 +28,12 @@ export default (o, c, dayjs) => { // locale needed later
   dayjs.localeData = () => {
     const localeObject = dayjs.Ls[dayjs.locale()]
     return {
-      firstDayOfWeek: () => localeObject.weekStart || 0
+      firstDayOfWeek: () => localeObject.weekStart || 0,
+      weekdays: () => localeObject.weekdays,
+      weekdaysShort: () => getShort(localeObject, 'weekdaysShort', 'weekdays', 3),
+      weekdaysMin: () => getShort(localeObject, 'weekdaysMin', 'weekdays', 2),
+      months: () => localeObject.months,
+      monthsShort: () => getShort(localeObject, 'monthsShort', 'months', 3)
     }
   }
 }

test/plugin/localeData.test.js

@@ -38,14 +38,16 @@ it('Instance localeData', () => {
 
 
 it('Global localeData', () => {
-  dayjs.locale('zh-cn')
-  moment.locale('zh-cn')
-  let dayjsLocaleData = dayjs.localeData()
-  let momentLocaleData = moment.localeData()
-  expect(dayjsLocaleData.firstDayOfWeek()).toBe(momentLocaleData.firstDayOfWeek())
-  dayjs.locale('en')
-  moment.locale('en')
-  dayjsLocaleData = dayjs.localeData()
-  momentLocaleData = moment.localeData()
-  expect(dayjsLocaleData.firstDayOfWeek()).toBe(momentLocaleData.firstDayOfWeek())
+  ['zh-cn', 'en'].forEach((lo) => {
+    dayjs.locale(lo)
+    moment.locale(lo)
+    const dayjsLocaleData = dayjs.localeData()
+    const momentLocaleData = moment.localeData()
+    expect(dayjsLocaleData.firstDayOfWeek()).toBe(momentLocaleData.firstDayOfWeek())
+    expect(dayjsLocaleData.months()).toEqual(momentLocaleData.months())
+    expect(dayjsLocaleData.monthsShort()).toEqual(momentLocaleData.monthsShort())
+    expect(dayjsLocaleData.weekdays()).toEqual(momentLocaleData.weekdays())
+    expect(dayjsLocaleData.weekdaysShort()).toEqual(momentLocaleData.weekdaysShort())
+    expect(dayjsLocaleData.weekdaysMin()).toEqual(momentLocaleData.weekdaysMin())
+  })
 })