feat: Lavamoat in the hathor-wallet-headless

.envrc

@@ -0,0 +1,7 @@
+if [[ $(type -t use_flake) != function ]]; then
+  echo "ERROR: use_flake function missing."
+  echo "Please update direnv to v2.30.0 or later."
+  exit 1
+fi
+
+use flake

.gitignore

@@ -15,3 +15,4 @@ coverage-integration
 tmp/
 
 dist/
+.direnv/

flake.nix

@@ -0,0 +1,42 @@
+{
+  description = "virtual environments";
+
+  inputs = {
+    devshell.url = "github:numtide/devshell";
+    flake-utils.url = "github:numtide/flake-utils";
+    unstableNixPkgs.url = "nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, flake-utils, devshell, nixpkgs, unstableNixPkgs, ... }@inputs:
+    let
+      overlays.default = final: prev: 
+        let
+          packages = self.packages.${final.system};
+          inherit (packages) node-packages;
+        in
+        {
+          nodejs = final.nodejs-18_x;
+          nodePackages = prev.nodePackages;
+          yarn = (import unstableNixPkgs { system = final.system; }).yarn-berry;
+        };
+    in
+    flake-utils.lib.eachDefaultSystem (system: {
+      devShell =
+        let pkgs = import nixpkgs {
+          inherit system;
+
+          overlays = [
+            devshell.overlays.default
+            overlays.default
+          ];
+        };
+        in
+        pkgs.devshell.mkShell {
+          packages = with pkgs; [
+            nixpkgs-fmt
+            nodejs_22
+            yarn
+          ];
+        };
+    });
+}