init nix-features

elmskell-frontend.nix

@@ -0,0 +1,34 @@
+{
+  esbuild,
+  stdenv,
+  elmPackages,
+  ...
+}: let
+  elmConfig = elmPackages.fetchElmDeps {
+    elmPackages = import ./frontend/elm-srcs.nix;
+    elmVersion = "0.19.1";
+    registryDat = ./frontend/registry.dat;
+  };
+in
+  stdenv.mkDerivation {
+    pname = "elmskell-backend";
+    version = "0.1.0";
+    src = ./frontend;
+    nativeBuildInputs = [
+      esbuild
+      elmPackages.elm
+    ];
+    buildInputs = [
+    ];
+    configurePhase = ''
+      ${elmConfig}
+    '';
+    buildPhase = ''
+      elm make src/Main.elm --optimize --output=tmp.js
+      esbuild tmp.js --minify --target=es5 --outfile=main.js
+    '';
+    installPhase = ''
+      mkdir -p $out
+      cp main.js $out/main.js
+    '';
+  }