Cleanup removing legacy scala.js libs and authentication code

flake.nix

@@ -0,0 +1,37 @@
+{
+  inputs = {
+    typelevel-nix.url = "github:typelevel/typelevel-nix";
+    nixpkgs.follows = "typelevel-nix/nixpkgs";
+    flake-utils.follows = "typelevel-nix/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, typelevel-nix }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs-x86_64 = import nixpkgs {
+            system = "x86_64-darwin";
+        };
+        scala-cli-overlay = final: prev: {
+            scala-cli = pkgs-x86_64.scala-cli;
+        };
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ typelevel-nix.overlay scala-cli-overlay];
+        };
+      in
+      {
+        devShell = pkgs.devshell.mkShell {
+          imports = [ typelevel-nix.typelevelShell ];
+          packages = [
+            pkgs.nodePackages.vscode-langservers-extracted
+            pkgs.nodePackages.prettier
+            pkgs.websocat
+          ];
+          typelevelShell = {
+            nodejs.enable = true;
+            jdk.package = pkgs.jdk17;
+          };
+        };
+      }
+    );
+}