Update firebase-tools.nix

overlays/firebase-tools.nix

@@ -2,16 +2,18 @@
 # This file exports a single overlay function that forces `firebase-tools`
 # to use `nodejs_22` when available, falling back to `nodejs` otherwise.
 #
-# It's intended to be imported directly in a host's `nixpkgs.overlays`,
-# e.g. in `hosts/server/configuration.nix`.
+# firebase-tools uses buildNpmPackage which accepts nodejs as a parameter.
+# We override buildNpmPackage to use the desired nodejs version.
 final: prev:
 let
   # Prefer nodejs_22 if present in the previous package set; otherwise use nodejs.
   nodejsChoice = if builtins.hasAttr "nodejs_22" prev then prev.nodejs_22 else prev.nodejs;
 in
 {
-  # Override firebase-tools to use the chosen Node.js package.
+  # Override firebase-tools by providing a custom buildNpmPackage with our nodejs choice
   firebase-tools = prev.firebase-tools.override {
+    buildNpmPackage = prev.buildNpmPackage.override {
       nodejs = nodejsChoice;
     };
+  };
 }