fix: Allow set start day of week in locale && Allow set week in weekOfYear plugin

Author: iamkun

src/index.js

@@ -172,8 +172,7 @@ class Dayjs {
         return isStartOf ? instanceFactory(1, this.$M) :
           instanceFactory(0, this.$M + 1)
       case C.W: {
-        const l = this.$locale()
-        const weekStart = l && l.weekStart === 1 ? 1 : 0
+        const weekStart = this.$locale().weekStart || 0
         return isStartOf ? instanceFactory(this.$D - (this.$W - weekStart), this.$M) :
           instanceFactory(this.$D + (6 - (this.$W - weekStart)), this.$M)
       }

src/locale/zh-cn.js

@@ -8,6 +8,7 @@ const locale = {
   months: '一月_二月_三月_四月_五月_六月_七月_八月_九月_十月_十一月_十二月'.split('_'),
   monthsShort: '1月_2月_3月_4月_5月_6月_7月_8月_9月_10月_11月_12月'.split('_'),
   ordinal: n => `${n}日`,
+  weekStart: 1,
   formats: {
     LT: 'HH:mm',
     LTS: 'HH:mm:ss',

test/manipulate.test.js

@@ -1,6 +1,7 @@
 import moment from 'moment'
 import MockDate from 'mockdate'
 import dayjs from '../src'
+import '../src/locale/zh-cn'
 
 beforeEach(() => {
   MockDate.set(new Date())
@@ -28,6 +29,10 @@ describe('StartOf EndOf', () => {
     expect(dayjs().startOf('otherString').valueOf()).toBe(moment().startOf('otherString').valueOf())
     expect(dayjs().endOf('otherString').valueOf()).toBe(moment().endOf('otherString').valueOf())
   })
+
+  it('StartOf week with locale', () => {
+    expect(dayjs().locale('zh-cn').startOf('week').format()).toBe(moment().locale('zh-cn').startOf('week').format())
+  })
 })
 
 

test/plugin/weekOfYear.test.js

@@ -22,4 +22,5 @@ it('Week of year', () => {
   expect(dayjs().weeks(week).week()).toBe(moment().weeks(week).week())
   expect(dayjs().weeks(-week).week()).toBe(moment().weeks(-week).week())
   expect(dayjs().weeks(55).week()).toBe(moment().weeks(55).week())
+  expect(dayjs().weeks()).toBe(moment().weeks())
 })