Source/Classes/PSLanguageType.ps1
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using module .\..\..\..\ObjectGraphTools using namespace System.Collections.Generic Class PSLanguageType { hidden static $_TypeCache = [Dictionary[String,Bool]]::new() hidden Static PSLanguageType() { # Hardcoded [PSLanguageType]::_TypeCache['System.Void'] = $True [PSLanguageType]::_TypeCache['System.Management.Automation.PSCustomObject'] = $True # https://github.com/PowerShell/PowerShell/issues/20767 } static [Bool]IsRestricted($TypeName) { if ($Null -eq $TypeName) { return $True } # Warning: a $Null is considered a restricted "type"! $Type = $TypeName -as [Type] if ($Null -eq $Type) { Throw 'Unknown type name: $TypeName' } $TypeName = $Type.FullName return $TypeName -in 'bool', 'array', 'hashtable' } static [Bool]IsConstrained($TypeName) { # https://stackoverflow.com/a/64806919/1701026 if ($Null -eq $TypeName) { return $True } # Warning: a $Null is considered a constrained "type"! $Type = $TypeName -as [Type] if ($Null -eq $Type) { Throw 'Unknown type name: $TypeName' } $TypeName = $Type.FullName if (-not [PSLanguageType]::_TypeCache.ContainsKey($TypeName)) { [PSLanguageType]::_TypeCache[$TypeName] = try { $ConstrainedSession = [PowerShell]::Create() $ConstrainedSession.RunSpace.SessionStateProxy.LanguageMode = 'Constrained' $ConstrainedSession.AddScript("[$TypeName]0").Invoke().Count -ne 0 -or $ConstrainedSession.Streams.Error[0].FullyQualifiedErrorId -ne 'ConversionSupportedOnlyToCoreTypes' } catch { $False } } return [PSLanguageType]::_TypeCache[$TypeName] } } |