Removes all previous versions of an installed module

Remove-ModulePreviousVersion.ps1

function Remove-ModulePreviousVersion {
    <#
    .SYNOPSIS
        Removes all previous versions of given module.
    .DESCRIPTION
        Long description
    .EXAMPLE
        PS C:\> $m = 'oh-my-posh'
        PS C:\> Remove-ModulePreviousVersion -ModuleName $m -Verbose -WhatIf
        Removes all previous versions of given module oh-mu-posh
    .INPUTS
        [String]
    .NOTES
        Supports Verbose. Support WhatIf.
    #>
    [cmdletbinding(SupportsShouldProcess)]
    param(
        [Parameter(ValueFromPipeline = $true,Position=0)]
        [string] $ModuleName
    )

    begin
    {
        # set common parameters
        $ErrorActionPreference = 'Stop'
        $commonParams = @{}
        if($WhatIfPreference.IsPresent) {$commonParams.Add('WhatIf', $true)}
        if($VerbosePreference.IsPresent) {$commonParams.Add('Verbose', $true)}

        # ensure user is admin
        $currentPrincipal = New-Object Security.Principal.WindowsPrincipal([Security.Principal.WindowsIdentity]::GetCurrent())
        [bool] $Admin = $currentPrincipal.IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)
        if(-not ($Admin)) {
            Write-Warning "User not admin. Please elevate shell."
            Break
        }

        # capture function name for logging
        $f = (Get-PSCallStack).Command[0]

        # get latest installed version of module
        Write-Verbose "[$f] Determining latest version of $ModuleName"
        $Latest = Get-InstalledModule $ModuleName -Verbose:$VerbosePreference
    }
    process
    {
        # determine previously installed versions, if any
        Write-Verbose "[$f] Determining installed versions of $ModuleName"
        $InstalledVersions = Get-InstalledModule $ModuleName -AllVersions -Verbose:$VerbosePreference | ? {
            $_.Version -ne $Latest.Version
        }
    }
    end
    {
        # if older versions, remove
        if ($InstalledVersions)
        {
            $InstalledVersions | % {
                Write-Verbose "[$f] Removing version $($_.Version) of $($_.Name)"

                $paramHash = @{
                    Name = $_.Name
                    RequiredVersion = $_.Version
                }
                Uninstall-Module @paramHash -Verbose:$VerbosePreference -WhatIf:$WhatIfPreference
            }
        }
        else
        {
            "[$f] No versions of $ModuleName module previously installed."
        }
        Write-Verbose "[$f] Function execution complete."
    }
}