Automate Node.js Dependency Installation

#!/bin/bash

# This script checks if Node.js project dependencies are installed
# If not, it attempts to install them using yarn (if available) or npm.

PROJECT_ROOT=$(pwd)
NODE_MODULES_PATH="$PROJECT_ROOT/node_modules"

echo "Checking for Node.js dependencies in $PROJECT_ROOT..."

if [ ! -d "$NODE_MODULES_PATH" ]; then
    echo "node_modules directory not found. Attempting to install dependencies..."
    
    # Check if yarn is installed and use it
    if command -v yarn &> /dev/null; then
        echo "Yarn detected. Installing with yarn..."
        yarn install
        INSTALL_STATUS=$?
    # Else, use npm
    elif command -v npm &> /dev/null; then
        echo "npm detected. Installing with npm..."
        npm install
        INSTALL_STATUS=$?
    else
        echo "Error: Neither yarn nor npm found. Please install Node.js and a package manager."
        exit 1
    fi
    
    if [ $INSTALL_STATUS -eq 0 ]; then
        echo "Dependencies installed successfully!"
    else
        echo "Error: Dependency installation failed."
        exit 1
    fi
else
    echo "node_modules directory found. Dependencies appear to be installed."
    echo "To force a re-installation, delete node_modules and run this script again."
fi

echo "Dependency check complete."