fix(isUUID): fix for null version argument supply (validatorjs#1777)

Author: theteladras

src/lib/isUUID.js

@@ -7,8 +7,8 @@ const uuid = {
   all: /^[0-9A-F]{8}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{12}$/i,
 };
 
-export default function isUUID(str, version = 'all') {
+export default function isUUID(str, version) {
   assertString(str);
-  const pattern = uuid[version];
+  const pattern = uuid[![undefined, null].includes(version) ? version : 'all'];
   return pattern && pattern.test(str);
 }

test/validators.js

@@ -4450,6 +4450,34 @@ describe('Validators', () => {
         'AAAAAAAA-1111-1111-AAAG-111111111111',
       ],
     });
+    test({
+      validator: 'isUUID',
+      args: [undefined],
+      valid: [
+        'A117FBC9-4BED-3078-CF07-9141BA07C9F3',
+        'A117FBC9-4BED-5078-AF07-9141BA07C9F3',
+      ],
+      invalid: [
+        '',
+        'xxxA987FBC9-4BED-3078-CF07-9141BA07C9F3',
+        'A987FBC94BED3078CF079141BA07C9F3',
+        'A11AAAAA-1111-1111-AAAG-111111111111',
+      ],
+    });
+    test({
+      validator: 'isUUID',
+      args: [null],
+      valid: [
+        'A127FBC9-4BED-3078-CF07-9141BA07C9F3',
+      ],
+      invalid: [
+        '',
+        'xxxA987FBC9-4BED-3078-CF07-9141BA07C9F3',
+        'A127FBC9-4BED-3078-CF07-9141BA07C9F3xxx',
+        '912859',
+        'A12AAAAA-1111-1111-AAAG-111111111111',
+      ],
+    });
     test({
       validator: 'isUUID',
       args: [3],