Add devshell & treefmt

.envrc

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+#! /bin/sh
+
+# reload when these files change
+watch_file devshell/flake.nix
+watch_file devshell/flake.lock
+
+{
+  # shell gc root dir
+  mkdir -p "$(direnv_layout_dir)"
+  eval "$(nix print-dev-env ./devshell\#default --no-update-lock-file --no-write-lock-file --profile $(direnv_layout_dir)/flake-profile)"
+}
+

.gitignore

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+/.direnv
+/.data
+result
+

devshell/flake.nix

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+{
+  description = "Bitte Cells development shell";
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+  inputs.devshell.url = "github:numtide/devshell";
+  inputs.alejandra.url = "github:kamadorueda/alejandra";
+  inputs.alejandra.inputs.treefmt.url = "github:divnix/blank";
+  inputs.std.url = "github:divnix/std";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+  outputs = inputs:
+    inputs.flake-utils.lib.eachSystem ["x86_64-linux" "x86_64-darwin"] (
+      system: let
+        inherit
+          (inputs.std.deSystemize system inputs)
+          main
+          devshell
+          nixpkgs
+          alejandra
+          treefmt
+          ;
+      in {
+        devShells.default = devshell.legacyPackages.mkShell {
+          name = "Data Merge";
+          commands = [{package = nixpkgs.legacyPackages.treefmt;}];
+          packages = [
+            alejandra.defaultPackage
+            nixpkgs.legacyPackages.shfmt
+            nixpkgs.legacyPackages.nodePackages.prettier
+            nixpkgs.legacyPackages.nodePackages.prettier-plugin-toml
+            nixpkgs.legacyPackages.python3Packages.black
+          ];
+          devshell.startup.nodejs-setuphook = nixpkgs.lib.stringsWithDeps.noDepEntry ''
+            export NODE_PATH=${
+              nixpkgs.legacyPackages.nodePackages.prettier-plugin-toml
+            }/lib/node_modules:$NODE_PATH
+          '';
+        };
+      }
+    );
+}