Script to delete old NuGet packages from the default global packages folder which haven't been accessed for 150 days

Clear-NuGet-Cache.ps1

[CmdletBinding(SupportsShouldProcess=$True)]
Param(
   [int]$CutoffDays = 150
)

$cutoffDate = (Get-Date).AddDays(-$CutoffDays)

# get path to cached NuGet packages 
$nugetCachePath = .\Get-Nuget-Cache-Path.ps1

# get all package versions
$packages = gci -Path $nugetCachePath | gci

# get only those folders which weren't accessed since $cutoffDate, and also get their lengths
$oldPackages = $packages |
  ? { $_.LastAccessTimeUtc -le $cutoffDate } | 
  Sort-Object -Property LastAccessTime | 
  select Fullname,LastAccessTime,@{Name="Length";Expression={ (gci $_.Fullname -Recurse -Force | Measure-Object -Property Length -Sum).Sum }}

# delete those folder
$oldPackages | select -ExpandProperty Fullname | Remove-Item -Recurse

# output freed bytes
"{0:n2} Mb freed" -f (($oldPackages | Measure-Object -Property Length -Sum).Sum / 1Mb)

Get-NuGet-Cache-Path.ps1

[string]$ConfigFile = Join-Path "$([System.Environment]::GetFolderPath([System.Environment+SpecialFolder]::ApplicationData))" NuGet\NuGet.Config
if ([System.IO.File]::Exists($ConfigFile))
{
    [xml]$ConfigXml = Get-Content $ConfigFile
    # https://docs.microsoft.com/en-us/nuget/reference/nuget-config-file#config-section
    $XPath = "/configuration/config/add[@key='globalPackagesFolder']/@value"
    $globalPackagesFolder = Select-Xml -xml $ConfigXml -xpath $XPath
    if (!$globalPackagesFolder)
    {
        Join-Path "$([System.Environment]::GetFolderPath([System.Environment+SpecialFolder]::UserProfile))" ".nuget\packages"
    }
    else
    {
        $globalPackagesFolder.Node.Value
    }
}