Script to setup environment variables to make react-native build work.

setup-react-native-env.ps1

# Function to set an environment variable if it doesn't exist
function Set-EnvironmentVariableIfNotExists {
    param (
        [string]$name,
        [string]$value,
        [string]$target = "User"  # By default, set for current user
    )

    # Check if the environment variable exists
    $currentValue = [System.Environment]::GetEnvironmentVariable($name, $target)

    if (-not $currentValue) {
        # If it doesn't exist, set the environment variable
        [System.Environment]::SetEnvironmentVariable($name, $value, $target)
        Write-Host "Environment variable '$name' set to '$value'"
    } else {
        Write-Host "Environment variable '$name' already exists with value: '$currentValue'"
    }
}

# Function to add a directory to the user's Path if it's not already there
function Add-ToUserPath {
    param (
        [string]$newPath
    )

    # Get the current user's Path environment variable
    $currentPath = [System.Environment]::GetEnvironmentVariable("Path", "User")

    # Check if the path already exists in the Path variable
    if ($currentPath -notlike "*$newPath*") {
        # Append the new path
        $newPathValue = "$currentPath;$newPath"
        
        # Set the updated Path environment variable for the current user
        [System.Environment]::SetEnvironmentVariable("Path", $newPathValue, "User")
        
        # Display success message
        Write-Host "Added $newPath to the user's Path environment variable"
    } else {
        Write-Host "$newPath is already in the user's Path environment variable"
    }
}

# Set ANDROID_HOME
$androidHome = "$env:LOCALAPPDATA\Android\Sdk"
Set-EnvironmentVariableIfNotExists -name "ANDROID_HOME" -value $androidHome

# Set JAVA_HOME (JDK bundled with Android Studio)
$javaHome = "C:\Program Files\Android\Android Studio\jbr"
Set-EnvironmentVariableIfNotExists -name "JAVA_HOME" -value $javaHome

# Add platform-tools to the user's Path
$platformToolsPath = "$env:LOCALAPPDATA\Android\Sdk\platform-tools"
Add-ToUserPath -newPath $platformToolsPath

Write-Host "React Native environment setup is complete."