Modified Start-UDHotReloader from Adam Driscoll that includes an app pool restart when a file in the Endpoints subdirectory is modified so the changes are applied nearly instantly. This was intended to works with IIS.

Start-UDHotReloader.ps1

#Remove Import if not found and not using IIS 
Import-Module WebAdministration


Add-Type -TypeDefinition @"
   [System.Flags]
   public enum DashboardAction
   {
    Undefined = 0, 
    Update = 1,
    Restart = 2
   }
"@
function Start-UDHotReloader {
    param(
        [Parameter(Mandatory = $true)]
        $Root,
        [Parameter(Mandatory)]
        $UpdateToken,
        [Parameter(Mandatory)]
        $Url,
        $AppPool,
        [int]$UpdateDelay = 750,
        [String]$EndpointsPath = '*\Endpoints\*'
    )

    Process {
        $fileInfo = [System.IO.FileInfo]::new($Root)

        $fileSystemWatcher = [System.IO.FileSystemWatcher]::new($fileInfo.DirectoryName, "*.ps1")
        $fileSystemWatcher.NotifyFilter = [IO.NotifyFilters]::LastWrite
        $fileSystemWatcher.EnableRaisingEvents = $true
        $fileSystemWatcher.IncludeSubdirectories = $true
        $Global:DashboardAction = [DashboardAction]::Undefined
        $Global:DashboardActionDelay = New-Object -TypeName 'System.Timers.Timer'
        $Global:DashboardActionDelay.AutoReset = $true
        $Global:DashboardActionDelay.Interval = $UpdateDelay
        
        

        Register-ObjectEvent $Global:DashboardActionDelay elapsed -SourceIdentifier 'ActionDelay' -Action {
            try {
                $Operation = ""
                $Token = $event.MessageData.UpdateToken
                $Url = $event.MessageData.Url
                switch ($Global:DashboardAction) {
                    {$_ -band [DashboardAction]::Restart } {
                        $Operation = 'Apppool recycled'
                            Restart-WebAppPool -Name $event.MessageData.AppPool    
                            break
                        }
                      {$_ -band [DashboardAction]::Update} {
                          $Operation = 'Dashboard updated'
                        Update-UDDashboard -Url $Url -UpdateToken $Token -FilePath $event.MessageData.Root
                    }
                }
                if ($Global:DashboardAction -ne [DashboardAction]::Undefined) {
                    Write-Host "$Operation - $Url " -ForegroundColor Cyan
                }
                    
            }
            catch {
                Write-Host $_.Exception -ForegroundColor Red
            }
            Finally {
                $Global:DashboardAction = [DashboardAction]::Undefined
                $Global:DashboardActionDelay.Stop()
            }            

        } -MessageData @{ 
            Url = $Url 
            UpdateToken = $UpdateToken
            Root = $Root
            AppPool = $AppPool
        }


        Register-ObjectEvent $fileSystemWatcher Changed -SourceIdentifier FileChanged -Action {
            try {
                $Global:DashboardActionDelay.Stop()
                $Global:DashboardActionDelay.Start()
                $EndpointsPath = $event.MessageData.EndpointsPath
                $AppPool = $event.MessageData.AppPool
                
                $PerformRestart = $event.SourceEventArgs.FullPath -like $EndpointsPath  -and -not [String]::IsNullOrWhiteSpace($event.MessageData.AppPool)
                if ($PerformRestart) {
                    $Global:DashboardAction = $Global:DashboardAction -bor [DashboardAction]::Restart
                } else {
                    $Global:DashboardAction = $Global:DashboardAction -bor [DashboardAction]::Update
                }
            }
            catch {
                Write-Host $_.Exception -ForegroundColor Red
            }
         

        } -MessageData @{ 
            EndpointsPath = $EndpointsPath
            AppPool = $AppPool
        }
    }
}

$UDHotParams = @{
    Root = 'C:\Users\m\PoshUD-IIS\rest\src\root.ps1'
    UpdateToken = 'test'
    Url = 'https://Contoso.com:4444/'
    AppPool = 'PoshUD-IIS' # If omitted (because not using IIS), it will simply update dashboard
    UpdateDelay = 500  # Default is 750 ms
    EndpointsPath = '*\Endpoints\*' 
}

Start-UDHotReloader  @UDHotParams