diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..3550a30
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/.gitignore b/.gitignore
index 9fd68e8..e26b234 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,3 +10,5 @@ elm-stuff/
 *.zip
 packged/
 out-tsc/
+.direnv/
+.corepack/
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..c9c37b3
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,43 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1778458615,
+        "narHash": "sha256-cY07EsdhBJ8tFXPzDYevgqxRev9ZLxFonuq9wmq5kwg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "c6e5ca3c836a5f4dd9af9f2c1fc1c38f0fac988a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "systems": "systems"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..ab19998
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,50 @@
+{
+  description = "wolfcola-devtools development environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    systems.url = "github:nix-systems/default";
+  };
+
+  outputs =
+    {
+      nixpkgs,
+      systems,
+      ...
+    }:
+    let
+      eachSystem = nixpkgs.lib.genAttrs (import systems);
+    in
+    {
+      devShells = eachSystem (
+        system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+        in
+        {
+          default = pkgs.mkShell {
+            packages = with pkgs; [
+              nodejs_24
+              corepack
+              lefthook
+            ];
+
+            shellHook = ''
+              corepack enable --install-directory "$PWD/.corepack" >/dev/null 2>&1
+              export PATH="$PWD/.corepack:$PATH"
+
+              if [ ! -d node_modules ]; then
+                echo "node_modules missing — running pnpm install..."
+                pnpm install
+              elif [ pnpm-lock.yaml -nt node_modules ]; then
+                echo "pnpm-lock.yaml is newer than node_modules — running pnpm install..."
+                pnpm install
+              fi
+            '';
+          };
+        }
+      );
+
+      formatter = eachSystem (system: nixpkgs.legacyPackages.${system}.nixfmt);
+    };
+}