nix-flatpak to get declarative flatpaks

configuration.nix

@@ -105,7 +105,13 @@
   pavucontrol
   ];
 
-  services.flatpak.enable = true;
+  services.flatpak = {
+    enable = true;
+    update.onActivation = true;
+    packages = [
+      "com.heroicgameslauncher.hgl"
+    ];
+  };
 
   programs.firefox.enable = true;
 

flake.lock

@@ -42,6 +42,22 @@
         "type": "github"
       }
     },
+    "nix-flatpak": {
+      "locked": {
+        "lastModified": 1739444422,
+        "narHash": "sha256-iAVVHi7X3kWORftY+LVbRiStRnQEob2TULWyjMS6dWg=",
+        "owner": "gmodena",
+        "repo": "nix-flatpak",
+        "rev": "5e54c3ca05a7c7d968ae1ddeabe01d2a9bc1e177",
+        "type": "github"
+      },
+      "original": {
+        "owner": "gmodena",
+        "ref": "latest",
+        "repo": "nix-flatpak",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1749794982,
@@ -62,6 +78,7 @@
       "inputs": {
         "firefox-addons": "firefox-addons",
         "home-manager": "home-manager",
+        "nix-flatpak": "nix-flatpak",
         "nixpkgs": "nixpkgs"
       }
     }

flake.nix

@@ -12,9 +12,11 @@
       url = "gitlab:rycee/nur-expressions?dir=pkgs/firefox-addons";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+
+    nix-flatpak.url = "github:gmodena/nix-flatpak/?ref=latest";
   };
 
-  outputs = { nixpkgs, ... } @ inputs:
+  outputs = { self, nixpkgs, nix-flatpak, ... } @ inputs:
     let
       system = "x86_64-linux";
     in
@@ -25,6 +27,7 @@
         specialArgs = { inherit inputs system; };
         modules = [
           ./configuration.nix
+	  nix-flatpak.nixosModules.nix-flatpak
         ];
       };