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node_modules/moment/src/lib/utils/is-moment-input.js

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+import isObjectEmpty from './is-object-empty';
+import hasOwnProp from './has-own-prop';
+import isObject from './is-object';
+import isDate from './is-date';
+import isNumber from './is-number';
+import isString from './is-string';
+import { isMoment } from '../moment/constructor';
+import isArray from './is-array';
+
+// type MomentInput = Moment | Date | string | number | (number | string)[] | MomentInputObject | void; // null | undefined
+export function isMomentInput(input) {
+    return (
+        isMoment(input) ||
+        isDate(input) ||
+        isString(input) ||
+        isNumber(input) ||
+        isNumberOrStringArray(input) ||
+        isMomentInputObject(input) ||
+        input === null ||
+        input === undefined
+    );
+}
+
+export function isMomentInputObject(input) {
+    var objectTest = isObject(input) && !isObjectEmpty(input),
+        propertyTest = false,
+        properties = [
+            'years',
+            'year',
+            'y',
+            'months',
+            'month',
+            'M',
+            'days',
+            'day',
+            'd',
+            'dates',
+            'date',
+            'D',
+            'hours',
+            'hour',
+            'h',
+            'minutes',
+            'minute',
+            'm',
+            'seconds',
+            'second',
+            's',
+            'milliseconds',
+            'millisecond',
+            'ms',
+        ],
+        i,
+        property;
+
+    for (i = 0; i < properties.length; i += 1) {
+        property = properties[i];
+        propertyTest = propertyTest || hasOwnProp(input, property);
+    }
+
+    return objectTest && propertyTest;
+}
+
+function isNumberOrStringArray(input) {
+    var arrayTest = isArray(input),
+        dataTypeTest = false;
+    if (arrayTest) {
+        dataTypeTest =
+            input.filter(function (item) {
+                return !isNumber(item) && isString(input);
+            }).length === 0;
+    }
+    return arrayTest && dataTypeTest;
+}