clear

Function Test-FlagState {
    [CmdletBinding()]
    Param([Parameter(Mandatory = $false)][Alias("Force")][switch]$forceUpdate)
    process {
        Write-Host "forceUpdate flag was set to $forceUpdate and IsPresent evaluates to $($forceUpdate.IsPresent)";
    }
}

# Test-FlagState -forceUpdate:"Tomato"
# Test-FlagState -forceUpdate:(!!"Tomato")
# Test-FlagState -forceUpdate:(!!"")

# Test-FlagState -forceUpdate:$true
# Test-FlagState -forceUpdate:$false
# Test-FlagState -forceUpdate
# Test-FlagState
# Test-FlagState -forceUpdate:$null

Set-Alias TFS Test-FlagState -Force -Scope:Global