fix: update MinMax plugin 1. ignore the 'null' in args 2. return the only one arg (#2330)

Author: dchueri

src/plugin/minMax/index.js

@@ -1,12 +1,18 @@
 export default (o, c, d) => {
   const sortBy = (method, dates) => {
-    if (!dates || !dates.length || !dates[0] || (dates.length === 1 && !dates[0].length)) {
+    if (
+      !dates ||
+      !dates.length ||
+      (dates.length === 1 && !dates[0]) ||
+      (dates.length === 1 && Array.isArray(dates[0]) && !dates[0].length)
+    ) {
       return null
     }
     if (dates.length === 1 && dates[0].length > 0) {
       [dates] = dates
     }
-    let result
+    dates = dates.filter(date => date)
+    let result;
     [result] = dates
     for (let i = 1; i < dates.length; i += 1) {
       if (!dates[i].isValid() || dates[i][method](result)) {

test/plugin/minMax.test.js

@@ -55,3 +55,17 @@ it('If Invalid Date return Invalid Date', () => {
   expect(dayjs.min([arg1, arg2, arg3, arg4]).format())
     .toBe(arg4.format())
 })
+
+it('Ignore if exists an "null" argument', () => {
+  expect(dayjs.max(null, null, arg1, arg2, null, arg3).format())
+    .toBe(arg1.format())
+  expect(dayjs.min([null, null, arg1, arg2, null, arg3]).format())
+    .toBe(arg3.format())
+})
+
+it('Return the only date if just provided one argument', () => {
+  expect(dayjs.max(arg1).format())
+    .toBe(arg1.format())
+  expect(dayjs.min([arg1]).format())
+    .toBe(arg1.format())
+})