1 files changed, 10 insertions, 0 deletions
diff --git a/src/js/node/dns.js b/src/js/node/dns.js
index 2dc3895a2..e82e6a4b5 100644
--- a/src/js/node/dns.js
+++ b/src/js/node/dns.js
@@ -19,6 +19,16 @@ function lookup(domain, options, callback) {
     options = { family: options };
   }
 
+  if (domain !== domain || (typeof domain !== "number" && !domain)) {
+    console.warn(
+      `DeprecationWarning: The provided hostname "${String(
+        domain,
+      )}" is not a valid hostname, and is supported in the dns module solely for compatibility.`,
+    );
+    callback(null, null, 4);
+    return;
+  }
+
   dns.lookup(domain, options).then(
     res => {
       res.sort((a, b) => a.family - b.family);