function Test-IsPackageInstaller {
<#
.SYNOPSIS
    Returns true if a particular package is an installer package.
#>
    [CmdletBinding()]
    [OutputType([System.Boolean])]
    Param (
        [Parameter(Mandatory=$true)]
        [string]$packageName
    )

    foreach($match in $_InstallerPackages) {
        if($packageName -like $match) {
            return $true;
        }
    }
    return $false;
}