[other] add nix

Author: bredmond5

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -35,4 +35,5 @@ dist
 dev
 .nyc_output
 test-results.json
-.idea/
+.idea/
+.direnv/

flake.lock

@@ -0,0 +1,42 @@
+{
+  description = "NodeJS 16_x project";
+
+  inputs = {
+    # Specify the source of Home Manager and Nixpkgs.
+    branch-nix.url = "git+ssh://[email protected]/BranchMetrics/nix";
+  };
+
+  outputs = { self, branch-nix }:
+    let
+      nixpkgs = branch-nix.nixpkgs;
+      nixpkgs-unstable = branch-nix.nixpkgs-unstable;
+      extra-pkgs = branch-nix.packages;
+      utils = branch-nix.utils;
+      system-utils = branch-nix.system-utils;
+    in
+    utils.lib.eachDefaultSystem (system:
+      let
+        stable-pkgs = nixpkgs.legacyPackages.${system};
+        unstable-pkgs = nixpkgs.legacyPackages.${system};
+        pkgs = stable-pkgs // {
+          extra-pkgs = extra-pkgs.${system};
+          unstable = unstable-pkgs;
+        };
+        bazel-os = system-utils.getBazelOs system;
+        nodejs = pkgs.extra-pkgs.nodejs-16_x;
+      in
+      {
+        devShell = pkgs.mkShell {
+          nativeBuildInputs = [
+            nodejs
+          ];
+          shellHook = ''
+            if [ -f $HOME/.config/bin/setup-webstorm-sdk ] && [ -f ./.idea/workspace.xml ]; then
+              $HOME/.config/bin/setup-webstorm-sdk || echo "setup-webstorm-sdk failed"
+            fi
+          '';
+        };
+        formatter = pkgs.nixpkgs-fmt;
+      }
+    );
+}