Add type definitions for plugins

test/plugin/isBetween.d.test.ts

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+import * as dayjs from 'dayjs'
+import * as isBetween from 'dayjs/plugin/isBetween'
+
+dayjs.extend(isBetween)
+
+dayjs('2010-10-20').isBetween('2010-10-19', dayjs('2010-10-25')) === true

test/plugin/isLeapYear.d.test.ts

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+import * as dayjs from 'dayjs'
+import * as isLeapYear from 'dayjs/plugin/isLeapYear'
+
+dayjs.extend(isLeapYear)
+
+dayjs('2010-10-20').isLeapYear() === false

test/plugin/relativeTime.d.test.ts

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+import * as dayjs from 'dayjs'
+import * as relativeTime from 'dayjs/plugin/relativeTime'
+
+dayjs.extend(relativeTime)
+
+dayjs().fromNow().trim()
+dayjs().fromNow(true).trim()
+
+dayjs().from(dayjs()).trim()
+dayjs().from(123, true).trim()
+dayjs().from('2018-01-23').trim()
+dayjs().from(new Date(), true).trim()
+
+dayjs().toNow().trim()
+dayjs().toNow(true).trim()
+
+dayjs().to(dayjs()).trim()
+dayjs().to(123, true).trim()
+dayjs().to('2018-01-23').trim()
+dayjs().to(new Date(), true).trim()

test/plugin/weekOfYear.d.test.ts

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+import * as dayjs from 'dayjs'
+import * as weekOfYear from 'dayjs/plugin/weekOfYear'
+
+dayjs.extend(weekOfYear)
+
+dayjs('2010-10-20').week() === 43

types/plugin/advancedFormat.d.ts

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+import { PluginFunc } from 'dayjs'
+
+declare const plugin: PluginFunc
+export = plugin

types/plugin/buddhistEra.d.ts

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+import { PluginFunc } from 'dayjs'
+
+declare const plugin: PluginFunc
+export = plugin

types/plugin/isBetween.d.ts

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+import { PluginFunc, DateType } from 'dayjs'
+
+declare const plugin: PluginFunc
+export = plugin
+
+declare module 'dayjs' {
+  interface Dayjs {
+    isBetween(a: DateType, b: DateType): boolean
+  }
+}

types/plugin/isLeapYear.d.ts

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+import { PluginFunc } from 'dayjs'
+
+declare const plugin: PluginFunc
+export = plugin
+
+declare module 'dayjs' {
+  interface Dayjs {
+    isLeapYear(): boolean
+  }
+}

types/plugin/relativeTime.d.ts

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+import { PluginFunc, DateType } from 'dayjs'
+
+declare const plugin: PluginFunc
+export = plugin
+
+declare module 'dayjs' {
+  interface Dayjs {
+    fromNow(withoutSuffix?: boolean): string
+    from(compared: DateType, withoutSuffix?: boolean): string
+    toNow(withoutSuffix?: boolean): string
+    to(compared: DateType, withoutSuffix?: boolean): string
+  }
+}

types/plugin/weekOfYear.d.ts

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+import { PluginFunc } from 'dayjs'
+
+declare const plugin: PluginFunc
+export = plugin
+
+declare module 'dayjs' {
+  interface Dayjs {
+    week(): number
+  }
+}