net: add net.BlockList.isBlockList(value)

PR-URL: #56078 Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: theanarkh <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Chemi Atlow <[email protected]>

Author: jasnell

doc/api/net.md

@@ -170,6 +170,15 @@ added:
 
 The list of rules added to the blocklist.
 
+### `BlockList.isBlockList(value)`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+*`value`{any} Any JS value
+* Returns `true` if the `value` is a `net.BlockList`.
+
 ## Class: `net.SocketAddress`
 
 <!-- YAML

lib/internal/blocklist.js

@@ -43,6 +43,15 @@ class BlockList{
 this[kHandle][owner_symbol]=this;
 }
 
+/**
+ * Returns true if the value is a BlockList
+ * @param{any} value
+ * @returns{boolean}
+ */
+staticisBlockList(value){
+returnvalue?.[kHandle]!==undefined;
+}
+
 [kInspect](depth,options){
 if(depth<0)
 returnthis;

test/parallel/test-blocklist.js

@@ -282,3 +282,8 @@ const util = require('util');
 assert(!blocklist.check('1.1.1.2'));
 assert(!blocklist.check('2.3.4.5'));
 }
+
+{
+assert(BlockList.isBlockList(newBlockList()));
+assert(!BlockList.isBlockList({}));
+}