From 5be8f8d2ad47431511b99cb288dc42ea6e3c8b6a Mon Sep 17 00:00:00 2001
From: Joe Hanley <joehanley@google.com>
Date: Tue, 21 Apr 2026 09:55:55 -0700
Subject: [PATCH 1/2] feat: ignore punycode deprecation warning on Node 22

### Description
Added a warning handler in the CLI entry point to ignore the `DEP0040` (punycode deprecation) warning. This warning is triggered by dependencies (like `tr46`) on Node 22 because Node 22 deprecates the built-in `punycode` module. Since we cannot easily update the dependencies to avoid it without risking regressions or security issues, ignoring the specific warning is the safest approach.
Fixes #10385

### Scenarios Tested
- Verified that unit tests pass (4269 passing).
- Verified that the changes are limited to `src/bin/firebase.ts` and `CHANGELOG.md`.

### Sample Commands
None (this is an internal warning suppression).
---
 CHANGELOG.md        |  1 +
 src/bin/firebase.ts | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6bef9a30b97..4bf88a6f9b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,4 @@
+- Suppressed the 'punycode' deprecation warning on Node 22 by ignoring the `DEP0040` code.
 - Fixed an issue where hosting deploy allowed publishing to a site in a different project. (#10376)
 - Added 'firebase_deploy' and 'firebase_deploy_status' MCP tools.
 - Added SSE mode support to `firebase mcp`. To use it, run `firebase mcp --mode=sse --port=3000`, and connect your client on `http://localhost:3000`.
diff --git a/src/bin/firebase.ts b/src/bin/firebase.ts
index 9e80b9748ac..5350a6d51a1 100755
--- a/src/bin/firebase.ts
+++ b/src/bin/firebase.ts
@@ -3,6 +3,24 @@
 // Check for older versions of Node no longer supported by the CLI.
 import * as semver from "semver";
 const pkg = require("../../package.json");
+
+interface NodeWarning extends Error {
+  code?: string;
+}
+
+// List of warning codes to silence
+const IGNORED_WARNINGS = [
+  "DEP0040", // Punycode module is deprecated. Ignored because transitive dependencies (e.g. tr46) still use it via require('punycode/') or directly.
+];
+
+process.on("warning", (warning) => {
+  const nodeWarning = warning as NodeWarning;
+  if (nodeWarning.code && IGNORED_WARNINGS.includes(nodeWarning.code)) {
+    return;
+  }
+  console.warn(nodeWarning.stack || nodeWarning.message);
+});
+
 const nodeVersion = process.version;
 if (!semver.satisfies(nodeVersion, pkg.engines.node)) {
   console.error(

From 7ee19a9b30b116f47cdb38660fbbde5af75bafd1 Mon Sep 17 00:00:00 2001
From: Joe Hanley <joehanley@google.com>
Date: Tue, 21 Apr 2026 10:14:02 -0700
Subject: [PATCH 2/2] Better changelog

---
 CHANGELOG.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4bf88a6f9b6..0f154723ece 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-- Suppressed the 'punycode' deprecation warning on Node 22 by ignoring the `DEP0040` code.
+- Suppressed the 'punycode' deprecation warning during `firebase deploy` on Node 22. (#10385)
 - Fixed an issue where hosting deploy allowed publishing to a site in a different project. (#10376)
 - Added 'firebase_deploy' and 'firebase_deploy_status' MCP tools.
 - Added SSE mode support to `firebase mcp`. To use it, run `firebase mcp --mode=sse --port=3000`, and connect your client on `http://localhost:3000`.