diff --git a/nix/default.nix b/nix/default.nix
deleted file mode 100644
index 74c6a83..0000000
--- a/nix/default.nix
+++ /dev/null
@@ -1,122 +0,0 @@
-{
-  pkgs,
-  lib ? pkgs.lib,
-}: let
-  inherit (builtins) readFile hashString split elemAt fetchurl toJSON baseNameOf;
-  inherit (pkgs) linkFarm writeText stdenv writeShellScriptBin;
-  inherit (lib) flatten mapAttrsToList importJSON cleanSourceWith;
-
-  urlPart = url: elemAt (flatten (split "://([a-z0-9\.]*)" url));
-  artifactPath = url: "${urlPart url 0}/${urlPart url 1}/${hashString "sha256" (urlPart url 2)}";
-
-  mkDepsLink = lockfile:
-    linkFarm "deps" (flatten (
-      mapAttrsToList
-      (
-        url: sha256: [
-          {
-            name = artifactPath url;
-            path = fetchurl {inherit url sha256;};
-          }
-          {
-            name = (artifactPath url) + ".metadata.json";
-            path = writeText "metadata.json" (toJSON {
-              inherit url;
-              headers = {};
-            });
-          }
-        ]
-      )
-      (importJSON lockfile)
-    ));
-in rec {
-  mkBundled = {
-    name,
-    version,
-    src,
-    entrypoint,
-    lockfile,
-    importMap ? null,
-    denoFlags ? [],
-  }:
-    stdenv.mkDerivation {
-      inherit name version entrypoint;
-      denoFlags =
-        denoFlags
-        ++ (
-          if importMap != null
-          then ["--import-map" importMap]
-          else []
-        );
-
-      src = cleanSourceWith {
-        inherit src;
-        filter = path: type: (baseNameOf path != "bundled.js");
-      };
-      buildInputs = with pkgs; [
-        deno
-        jq
-      ];
-
-      buildPhase = ''
-        export DENO_DIR=`mktemp -d`
-        ln -s "${mkDepsLink lockfile}" $(deno info --json | jq -r .modulesCache)
-
-        deno bundle $denoFlags $entrypoint bundled.js
-      '';
-      installPhase = ''
-        mkdir -p $out/dist
-        install -t $out/dist bundled.js
-      '';
-    };
-  mkBundledWrapper = {
-    name,
-    entrypoint,
-    ...
-  } @ args: let
-    bundled = mkBundled args;
-  in
-    writeShellScriptBin
-    "${name}"
-    "${pkgs.deno}/bin/deno run ${bundled}/dist/bundled.js";
-
-  mkExecutable = {
-    name,
-    version,
-    src,
-    entrypoint,
-    lockfile,
-    importMap ? null,
-    denoFlags ? [],
-  }:
-    stdenv.mkDerivation {
-      inherit src name entrypoint;
-      denoFlags =
-        denoFlags
-        ++ ["--lock" "${src}/${lockfile}"]
-        ++ ["--cached-only"]
-        ++ ["--output" name]
-        ++ (
-          if importMap != null
-          then ["--import-map" "${src}/${importMap}"]
-          else []
-        );
-      buildInputs = with pkgs; [
-        deno
-        jq
-      ];
-      fixupPhase = ":";
-
-      buildPhase = ''
-        export DENO_DIR=`mktemp -d`
-        ln -s "${mkDepsLink "${src}/${lockfile}"}" $(deno info --json | jq -r .modulesCache)
-        ls $(dirname $src/$entrypoint)
-
-        deno compile $denoFlags "$entrypoint"
-      '';
-      installPhase = ''
-        mkdir -p $out/bin
-        mv "$name" "$out/bin/"
-      '';
-    };
-}
diff --git a/nix/make-bundled-wrapper.nix b/nix/make-bundled-wrapper.nix
new file mode 100644
index 0000000..0bb7413
--- /dev/null
+++ b/nix/make-bundled-wrapper.nix
@@ -0,0 +1,6 @@
+{pkgs, ...}: {name, ...} @ args: let
+  bundled = (pkgs.callPackage ./make-bundled.nix {}) args;
+in
+  pkgs.writeShellScriptBin
+  "${name}"
+  "${pkgs.deno}/bin/deno run ${bundled}/dist/bundled.js"
diff --git a/nix/make-bundled.nix b/nix/make-bundled.nix
new file mode 100644
index 0000000..57d5739
--- /dev/null
+++ b/nix/make-bundled.nix
@@ -0,0 +1,45 @@
+{
+  pkgs,
+  lib ? pkgs.lib,
+  ...
+}: {
+  name,
+  version,
+  src,
+  entrypoint,
+  lockfile,
+  importMap ? null,
+  denoFlags ? [],
+}: let
+  inherit (pkgs.callPackage ./utils.nix {}) mkDepsLink;
+in
+  pkgs.stdenv.mkDerivation {
+    inherit name version entrypoint;
+    denoFlags =
+      denoFlags
+      ++ (
+        if importMap != null
+        then ["--import-map" importMap]
+        else []
+      );
+
+    src = lib.cleanSourceWith {
+      inherit src;
+      filter = path: type: (baseNameOf path != "bundled.js");
+    };
+    buildInputs = with pkgs; [
+      deno
+      jq
+    ];
+
+    buildPhase = ''
+      export DENO_DIR=`mktemp -d`
+      ln -s "${mkDepsLink lockfile}" $(deno info --json | jq -r .modulesCache)
+
+      deno bundle $denoFlags $entrypoint bundled.js
+    '';
+    installPhase = ''
+      mkdir -p $out/dist
+      install -t $out/dist bundled.js
+    '';
+  }
diff --git a/nix/make-executable.nix b/nix/make-executable.nix
new file mode 100644
index 0000000..39fb4c7
--- /dev/null
+++ b/nix/make-executable.nix
@@ -0,0 +1,40 @@
+{pkgs, ...}: {
+  name,
+  version,
+  src,
+  entrypoint,
+  lockfile,
+  importMap ? null,
+  denoFlags ? [],
+}: let
+  inherit (pkgs.callPackage ./utils.nix {}) mkDepsLink;
+in
+  pkgs.stdenv.mkDerivation {
+    inherit src name entrypoint;
+    denoFlags =
+      denoFlags
+      ++ ["--lock" lockfile]
+      ++ ["--cached-only"]
+      ++ ["--output" name]
+      ++ (
+        if importMap != null
+        then ["--import-map" importMap]
+        else []
+      );
+    buildInputs = with pkgs; [
+      deno
+      jq
+    ];
+    fixupPhase = ":";
+
+    buildPhase = ''
+      export DENO_DIR=`mktemp -d`
+      ln -s "${mkDepsLink lockfile}" $(deno info --json | jq -r .modulesCache)
+
+      deno compile $denoFlags "$entrypoint"
+    '';
+    installPhase = ''
+      mkdir -p $out/bin
+      mv "$name" "$out/bin/"
+    '';
+  }
diff --git a/nix/utils.nix b/nix/utils.nix
new file mode 100644
index 0000000..719f199
--- /dev/null
+++ b/nix/utils.nix
@@ -0,0 +1,33 @@
+{
+  pkgs,
+  lib ? pkgs.lib,
+  ...
+}: let
+  inherit (builtins) hashString split elemAt fetchurl toJSON;
+  inherit (pkgs) linkFarm writeText;
+  inherit (lib) flatten mapAttrsToList importJSON;
+in rec {
+  urlPart = url: elemAt (flatten (split "://([a-z0-9\.]*)" url));
+  artifactPath = url: "${urlPart url 0}/${urlPart url 1}/${hashString "sha256" (urlPart url 2)}";
+  mkDepsLink = lockfile: (
+    linkFarm "deps" (lib.flatten (
+      mapAttrsToList
+      (
+        url: sha256: [
+          {
+            name = artifactPath url;
+            path = fetchurl {inherit url sha256;};
+          }
+          {
+            name = (artifactPath url) + ".metadata.json";
+            path = writeText "metadata.json" (toJSON {
+              inherit url;
+              headers = {};
+            });
+          }
+        ]
+      )
+      (importJSON lockfile)
+    ))
+  );
+}
diff --git a/overlay.nix b/overlay.nix
index d1ff507..6e145ce 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -1,5 +1,7 @@
 final: prev: {
   deno2nix = {
-    inherit (import ./nix {pkgs = prev;}) mkBundled mkBundledWrapper mkExecutable;
+    mkBundled = final.callPackage ./nix/make-bundled.nix {};
+    mkBundledWrapper = final.callPackage ./nix/make-bundled-wrapper.nix {};
+    mkExecutable = final.callPackage ./nix/make-executable.nix {};
   };
 }