Create simple script for setting up a dev environment. (#277)

README.md

@@ -22,6 +22,10 @@ This repository contains the Gemini Code CLI tool.
 
 ## Building
 
+### Prerequisites:
+
+The build toolchain requires `npm` and `jq` to be installed. You can use the `scripts/setup-dev.sh` script to install these prerequisites.
+
 To build the entire project, including the CLI package, run the following command from the root directory:
 
 ```bash

scripts/setup-dev.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -euo pipefail
+
+# Check if npm is installed
+if ! command -v npm &> /dev/null
+then
+    echo "npm not found. Installing npm via nvm..."
+    # Download and install nvm:
+    curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.3/install.sh | bash
+    # in lieu of restarting the shell
+    \. "$HOME/.nvm/nvm.sh"
+    # Download and install Node.js:
+    nvm install 22
+    # Verify the Node.js version:
+    node -v # Should print "v22.15.0".
+    nvm current # Should print "v22.15.0".
+    # Verify npm version:
+    npm -v # Should print "10.9.2".
+fi
+
+# Check if jq is installed
+if ! command -v jq &> /dev/null
+then
+    echo "jq not found. Installing jq..."
+    # This assumes a Debian/Ubuntu based system. Adjust for other distributions.
+    sudo apt-get update
+    sudo apt-get install -y jq
+fi
+
+echo "Development environment setup complete."