Get flake working

package/flake.nix

@@ -0,0 +1,69 @@
+{
+  description = "Sample Nix ts-node build";
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+    gitignore = {
+      url = "github:hercules-ci/gitignore.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    android-nixpkgs = {
+      url = "github:tadfisher/android-nixpkgs";
+    };
+  };
+  outputs = { self, nixpkgs, flake-utils, gitignore, android-nixpkgs, ... }:
+  flake-utils.lib.eachDefaultSystem (system:
+  let
+    pkgs = import nixpkgs { inherit system; };
+    nodejs = pkgs.nodejs-18_x;
+    # NOTE: this does not work
+    appBuild = pkgs.stdenv.mkDerivation {
+      name = "example-ts-node";
+      version = "0.1.0";
+      src = gitignore.lib.gitignoreSource ./.; # uses the gitignore in the repo to only copy files git would see
+      buildInputs = [ nodejs ];
+      # https://nixos.org/manual/nixpkgs/stable/#sec-stdenv-phases
+      buildPhase = ''
+        # each phase has pre/postHooks. When you make your own phase be sure to still call the hooks
+        runHook preBuild
+        npm ci
+        npm run build
+        runHook postBuild
+      '';
+      installPhase = ''
+        runHook preInstall
+        cp -r node_modules $out/node_modules
+        cp package.json $out/package.json
+        cp -r dist $out/dist
+        runHook postInstall
+      '';
+    };
+    android-sdk = android-nixpkgs.sdk.${system} (sdkPkgs: with sdkPkgs; [
+      cmdline-tools-latest
+      build-tools-30-0-3
+      build-tools-33-0-0
+      build-tools-33-0-1
+      build-tools-34-0-0
+      platform-tools
+      platforms-android-33
+      platforms-android-34
+      emulator
+      ndk-23-1-7779620
+      cmake-3-22-1
+      system-images-android-33-google-apis-x86-64
+      system-images-android-34-google-apis-x86-64
+    ]);
+  in with pkgs; {
+    defaultPackage = appBuild;
+    devShell = mkShell {
+      buildInputs = [ nodejs yarn watchman gradle_7 alejandra nodePackages.prettier ];
+      ANDROID_SDK_BIN = android-sdk;
+      shellHook = ''
+        export JAVA_HOME=${pkgs.jdk17.home}
+        source ${android-sdk.out}/nix-support/setup-hook
+        export PATH=${android-sdk}/bin:$PATH
+        ORG_GRADLE_PROJECT_ANDROID_HOME="$ANDROID_HOME"
+      '';
+    };
+  });
+}