From 2870a23d973e1b05c178393eb77682d377549f0e Mon Sep 17 00:00:00 2001
From: iamkun <kunhello@outlook.com>
Date: Thu, 28 Mar 2019 17:10:24 +0800
Subject: [PATCH] fix: Add plugin minMax to sopport .max .min

---
 src/plugin/minMax/index.js | 28 +++++++++++++++++++++++
 test/plugin/minMax.test.js | 46 ++++++++++++++++++++++++++++++++++++++
 types/plugin/minMax.d.ts   | 11 +++++++++
 3 files changed, 85 insertions(+)
 create mode 100644 src/plugin/minMax/index.js
 create mode 100644 test/plugin/minMax.test.js
 create mode 100644 types/plugin/minMax.d.ts

diff --git a/src/plugin/minMax/index.js b/src/plugin/minMax/index.js
new file mode 100644
index 000000000..d96d0568f
--- /dev/null
+++ b/src/plugin/minMax/index.js
@@ -0,0 +1,28 @@
+export default (o, c, d) => {
+  const sortBy = (method, dates) => {
+    if (!dates.length) {
+      return d()
+    }
+    if (dates.length === 1 && dates[0].length > 0) {
+      [dates] = dates
+    }
+    let result
+    [result] = dates
+    for (let i = 1; i < dates.length; i += 1) {
+      if (!dates[i].isValid() || dates[i][method](result)) {
+        result = dates[i]
+      }
+    }
+    return result
+  }
+
+  d.max = function () {
+    const args = [].slice.call(arguments, 0) // eslint-disable-line prefer-rest-params
+    return sortBy('isAfter', args)
+  }
+  d.min = function () {
+    const args = [].slice.call(arguments, 0) // eslint-disable-line prefer-rest-params
+    return sortBy('isBefore', args)
+  }
+}
+
diff --git a/test/plugin/minMax.test.js b/test/plugin/minMax.test.js
new file mode 100644
index 000000000..7cc9db92d
--- /dev/null
+++ b/test/plugin/minMax.test.js
@@ -0,0 +1,46 @@
+import MockDate from 'mockdate'
+import dayjs from '../../src'
+import minMax from '../../src/plugin/minMax'
+
+dayjs.extend(minMax)
+
+beforeEach(() => {
+  MockDate.set(new Date())
+})
+
+afterEach(() => {
+  MockDate.reset()
+})
+
+const arg1 = dayjs('2019-01-01')
+const arg2 = dayjs('2018-01-01')
+const arg3 = dayjs('2017-01-01')
+const arg4 = dayjs('Invalid Date')
+
+it('Return current time if no argument', () => {
+  expect(dayjs.max().format())
+    .toBe(dayjs().format())
+  expect(dayjs.min().format())
+    .toBe(dayjs().format())
+})
+
+it('Compare between arguments', () => {
+  expect(dayjs.max(arg1, arg2, arg3).format())
+    .toBe(arg1.format())
+  expect(dayjs.min(arg1, arg2, arg3).format())
+    .toBe(arg3.format())
+})
+
+it('Compare in array', () => {
+  expect(dayjs.max([arg1, arg2, arg3]).format())
+    .toBe(arg1.format())
+  expect(dayjs.min([arg1, arg2, arg3]).format())
+    .toBe(arg3.format())
+})
+
+it('If Invalid Date return Invalid Date', () => {
+  expect(dayjs.max(arg1, arg2, arg3, arg4).format())
+    .toBe(arg4.format())
+  expect(dayjs.min([arg1, arg2, arg3, arg4]).format())
+    .toBe(arg4.format())
+})
diff --git a/types/plugin/minMax.d.ts b/types/plugin/minMax.d.ts
new file mode 100644
index 000000000..1cca06ef2
--- /dev/null
+++ b/types/plugin/minMax.d.ts
@@ -0,0 +1,11 @@
+import { PluginFunc, ConfigType } from 'dayjs'
+
+declare const plugin: PluginFunc
+export = plugin
+
+declare module 'dayjs' {
+  export function max(dayjs: Dayjs[]): Dayjs
+  export function max(...dayjs: Dayjs[]): Dayjs
+  export function min(dayjs: Dayjs[]): Dayjs
+  export function min(...dayjs: Dayjs[]): Dayjs
+}