diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..1d953f4
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use nix
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..329b006
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+### direnv ###
+.direnv
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..3253981
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,9 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+let
+  default = pkgs.callPackage ./default.nix { };
+in
+pkgs.mkShell {
+  inputsFrom = [ default ];
+  buildInputs = [ default pkgs.shellcheck ];
+}