[nix] Add flake.nix with dev shell (#144)

Author: cbrewster

.envrc

@@ -0,0 +1,3 @@
+use flake
+dotenv_if_exists
+PATH_add ./node_modules/.bin

.gitignore

@@ -1,3 +1,6 @@
 dist
 node_modules
-example
+example
+
+# Nix
+/.direnv/

flake.lock

@@ -0,0 +1,25 @@
+{
+  description = "It's like tRPC but... with JSON Schema Support, duplex streaming and support for service multiplexing. Transport agnostic!";
+
+  inputs.nixpkgs.url = "github:nixos/nixpkgs";
+
+  outputs = { self, nixpkgs }:
+  let
+    mkDevShell = system:
+    let
+      pkgs = nixpkgs.legacyPackages.${system};
+    in
+    pkgs.mkShell {
+      nativeBuildInputs = with pkgs; [
+        nodejs
+        nodePackages.typescript-language-server
+      ];
+    };
+  in
+  {
+    devShells.aarch64-linux.default = mkDevShell "aarch64-linux";
+    devShells.aarch64-darwin.default = mkDevShell "aarch64-darwin";
+    devShells.x86_64-linux.default = mkDevShell "x86_64-linux";
+    devShells.x86_64-darwin.default = mkDevShell "x86_64-darwin";
+  };
+}

flake.nix

@@ -0,0 +1,11 @@
+import { defineConfig } from 'vite';
+import { configDefaults, coverageConfigDefaults } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    exclude: [...configDefaults.exclude, '**/.direnv/**'],
+    coverage: {
+      exclude: [...coverageConfigDefaults.exclude, '**/.direnv/**'],
+    },
+  },
+});