--- /dev/null
+/* @flow */
+"use strict";
+
+/**
+ * Check if a value is a valid 3, 4, 6 or 8 digit hex
+ */
+module.exports = function(value /*: string*/) /*: boolean*/ {
+ return /^#(?:[0-9a-fA-F]{3,4}|[0-9a-fA-F]{6}|[0-9a-fA-F]{8})$/.test(value);
+};