Launches a target script in a new process, passing through all parameters.

Start-Script.ps1

function Start-Script {
	<#
	.SYNOPSIS
		Launches a target script in a new process, passing through all parameters.
	
	.DESCRIPTION
		Launches a target script in a new process, passing through all parameters.
		Uses dynamic parameters to offer the same signature as the script itself.
		Uses the same powershell hosting application that executes Start-Script to start the new process.
	
	.PARAMETER ScriptPath
		Path to the scriptfile to launch.
	
	.EXAMPLE
		PS C:\> Start-Script .\newuser.ps1 -GivenName Max -Surname Mustermann

		Launches the script "newuser.ps1" with the parameters passed through.
	#>
	[Alias('ss')]
	[CmdletBinding()]
	param (
		[string]
		$ScriptPath
	)

	DynamicParam {
		$common = 'Verbose','Debug','ErrorAction','WarningAction','InformationAction','ErrorVariable','WarningVariable','InformationVariable','OutVariable','OutBuffer','PipelineVariable'
		if (($ScriptPath) -and (Test-Path $ScriptPath) -and (Get-Command $ScriptPath -ErrorAction Ignore))
		{
			$parameters = (Get-Command $ScriptPath).Parameters.Values | Where-Object Name -notin $common

			$paramDictionary = [System.Management.Automation.RuntimeDefinedParameterDictionary]::new()

			foreach ($parameterObject in $parameters) {
				$param = [System.Management.Automation.RuntimeDefinedParameter]::new($parameterObject.Name, $parameterObject.ParameterType, $parameterObject.Attributes)
				$paramDictionary.Add($parameterObject.Name, $param)
			}

			return $paramDictionary
		}
	}

	process {
		$stringParams = $PSBoundParameters | ConvertTo-PSFHashtable -Exclude ScriptPath | ConvertTo-PSFClixml
		$code = {
			$path = '{0}'
			$parameters = '{1}' | ConvertFrom-PSFClixml
			& $path @parameters
		}.ToString() -f $ScriptPath, $stringParams
		$encodedCommand = [convert]::ToBase64String([System.Text.Encoding]::Unicode.GetBytes($code))

		$powershell = (Get-Process -Id $pid).Path
		Start-Process -FilePath $powershell -ArgumentList '-NoExit','-NoProfile', '-EncodedCommand', $encodedCommand
	}
}