add flake for development on nixos, track lockfiles

Author: leonhma

.envrc

@@ -0,0 +1,10 @@
+if ! has nix_direnv_version || ! nix_direnv_version 2.2.1; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.2.1/direnvrc" "sha256-zelF0vLbEl5uaqrfIzbgNzJWGmLzCmYAkInj/LNxvKs="
+fi
+
+nix_direnv_watch_file flake.nix
+nix_direnv_watch_file flake.lock
+if ! use flake . --impure
+then
+  echo "devenv could not be built. The devenv environment was not loaded. Make the necessary changes to devenv.nix and hit enter to try again." >&2
+fi

.gitignore

@@ -7,6 +7,8 @@ yarn.lock
 .nyc_output
 coverage
 .yarn
+.devenv
+.direnv
 
 # Created by https://www.toptal.com/developers/gitignore/api/node,obsidian,windows,macos,linux,yarn
 # Edit at https://www.toptal.com/developers/gitignore?templates=node,obsidian,windows,macos,linux,yarn

flake.lock

@@ -0,0 +1,36 @@
+{
+  inputs = {
+    systems.url = "github:nix-systems/default";
+    devenv.url = "github:cachix/devenv";
+  };
+
+  outputs = { self, nixpkgs, devenv, systems, ... } @ inputs:
+    let
+      forEachSystem = nixpkgs.lib.genAttrs (import systems);
+    in
+    {
+      packages = forEachSystem (system: {
+        devenv-up = self.devShells.${system}.default.config.procfileScript;
+      });
+
+      devShells = forEachSystem
+        (system:
+          let
+            pkgs = nixpkgs.legacyPackages.${system};
+          in
+          {
+            default = devenv.lib.mkShell {
+              inherit inputs pkgs;
+              modules = [
+                {
+                  languages.javascript = {
+                    enable = true;
+                    pnpm.enable = true;
+                  };
+                  languages.typescript.enable = true;
+                }
+              ];
+            };
+          });
+    };
+}