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diff --git a/date-fns/src/isWeekend/index.ts b/date-fns/src/isWeekend/index.ts
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+++ b/date-fns/src/isWeekend/index.ts
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+import toDate from '../toDate/index'
+import requiredArgs from '../_lib/requiredArgs/index'
+
+/**
+ * @name isWeekend
+ * @category Weekday Helpers
+ * @summary Does the given date fall on a weekend?
+ *
+ * @description
+ * Does the given date fall on a weekend?
+ *
+ * ### v2.0.0 breaking changes:
+ *
+ * - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
+ *
+ * @param {Date|Number} date - the date to check
+ * @returns {Boolean} the date falls on a weekend
+ * @throws {TypeError} 1 argument required
+ *
+ * @example
+ * // Does 5 October 2014 fall on a weekend?
+ * const result = isWeekend(new Date(2014, 9, 5))
+ * //=> true
+ */
+export default function isWeekend(dirtyDate: Date | number): boolean {
+  requiredArgs(1, arguments)
+
+  const date = toDate(dirtyDate)
+  const day = date.getDay()
+  return day === 0 || day === 6
+}