From b0a52e4820709972108f01daaeedaa886be1739a Mon Sep 17 00:00:00 2001
From: qzylinra <qzylinra@users.noreply.github.com>
Date: Tue, 19 Aug 2025 06:13:41 +0800
Subject: [PATCH] flutter: update extraPackageConfigSetup

---
 .../build-flutter-application.nix             | 26 ++++++++++---------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/pkgs/development/compilers/flutter/build-support/build-flutter-application.nix b/pkgs/development/compilers/flutter/build-support/build-flutter-application.nix
index 1cbec9d5ebec..4eb8f310f265 100644
--- a/pkgs/development/compilers/flutter/build-support/build-flutter-application.nix
+++ b/pkgs/development/compilers/flutter/build-support/build-flutter-application.nix
@@ -109,18 +109,20 @@ let
             '';
         };
 
-        extraPackageConfigSetup = ''
-          # https://github.com/flutter/flutter/blob/3.13.8/packages/flutter_tools/lib/src/dart/pub.dart#L755
-          if [ "$('${lib.getExe buildPackages.yq}' '.flutter.generate // false' pubspec.yaml)" = "true" ]; then
-            export TEMP_PACKAGES=$(mktemp)
-            '${lib.getExe buildPackages.jq}' '.packages |= . + [{
-              name: "flutter_gen",
-              rootUri: "flutter_gen",
-              languageVersion: "2.12",
-            }]' "$out" > "$TEMP_PACKAGES"
-            cp "$TEMP_PACKAGES" "$out"
-            rm "$TEMP_PACKAGES"
-            unset TEMP_PACKAGES
+        # https://github.com/flutter/flutter/blob/edada7c56edf4a183c1735310e123c7f923584f1/packages/flutter_tools/lib/src/dart/pub.dart#L804
+        extraPackageConfigSetup = lib.optionalString (lib.versionOlder flutter.version "3.34.0") ''
+          if [ "$("${lib.getExe buildPackages.yq}" '.flutter.generate // false' pubspec.yaml)" = "true" ]; then
+            if ! "${lib.getExe buildPackages.jq}" -e '.packages[] | select(.name == "flutter_gen")' "$out" >/dev/null 2>&1; then
+              export TEMP_PACKAGES=$(mktemp)
+              "${lib.getExe buildPackages.jq}" '.packages |= . + [{
+                name: "flutter_gen",
+                rootUri: "flutter_gen",
+                languageVersion: "2.12"
+              }]' "$out" > "$TEMP_PACKAGES"
+              cp "$TEMP_PACKAGES" "$out"
+              rm "$TEMP_PACKAGES"
+              unset TEMP_PACKAGES
+            fi
           fi
         '';
       };