public/ConvertTo-Base64Compressed.ps1

function ConvertTo-Base64Compressed {
    <#
    .SYNOPSIS
        Convert string to Base64 compressed
    .DESCRIPTION
        Convert an ASCII string to Base64 compressed format
    .PARAMETER String
        Required. Text string to convert.
    .EXAMPLE
        "this is a test string" | ConvertTo-Base64Compressed
        returns "H4sIAAAAAAAEACvJyCxWAKJEhZLU4hKF4pKizLx0ALXWhvwVAAAA"
    .LINK
        https://github.com/Skatterbrainz/ds-utils/blob/master/docs/ConvertTo-Base64Compressed.md
    #>

    [CmdletBinding()]
    param (
        [parameter(Mandatory=$true,ValueFromPipeline=$true)][ValidateNotNullOrEmpty()]$string
    )
    begin {}
    process {
        $enc = [system.Text.Encoding]::UTF8
        $data = $enc.GetBytes($string)
        $compressedStream = [System.IO.MemoryStream]::new()
        $zipStream = [System.IO.Compression.GZipStream]::new($compressedStream, [System.IO.Compression.CompressionMode]::Compress)
        $zipStream.Write($data, 0, $data.Length);
        $zipStream.Close();
        $compressedData = $compressedStream.ToArray()
        [Convert]::ToBase64String($compressedData)
    }
    end {}
}
#New-Alias -Name "ConvertTo-Base64" -Value ConvertTo-Base64Compressed