https://gist.github.com/aetos382/6128df251617ac5bea99 が変な風に進化したらこうなった。

OutputHistory.ps1

$OutputHistoryContext = [PSCustomObject] @{
	Enabled = $true
	DisabledTemporary = $false
	Count = -1
	Queue = New-Object 'System.Collections.Queue'
	LastOutputVariableName = ''
}

function Out-Default {

	[CmdletBinding()]
	
	param(
		[Parameter(ValueFromPipeline)]
		[PSObject] $InputObject,
		
		[Switch] $Transcript)
	
	begin {
		$context = $OutputHistoryContext
		
		$wrappedCmdlet = $ExecutionContext.InvokeCommand.GetCmdlet('Microsoft.PowerShell.Core\Out-Default')
		$sb = { & $wrappedCmdlet @PSBoundParameters }
		$p = $sb.GetSteppablePipeline()
		$p.Begin($PSCmdlet)
		
		$outputs = @()
	}
	process {
		$p.Process($_)
		
		<#
			Get-OutputHistory 内で DisabledTemporary を設定するより先に begin ブロックが実行されてしまうので
			$enabled を begin ブロックで初期化してはいけない
		#>
		
		$enabled = $context.Enabled -and !$context.DisabledTemporary
		if ($_ -and $enabled) {
			$outputs += $_
		}
	}
	end {
		$p.End()
		
		if ($outputs -and $enabled) {
			$q = $context.Queue
			
			$q.Enqueue($outputs)
			
			if ($context.Count -ge 0) {
				while ($q.Count -gt $context.Count) {
					[void] $q.Dequeue()
				}
			}
			
			if ($context.LastOutputVariableName) {
				New-Variable -Name $context.LastOutputVariableName -Value $outputs -Scope Global -Option ReadOnly -Force
			}
		}
		
		$context.DisabledTemporary = $false
	}
}

function Get-OutputHistory {

	[OutputType([object[]])]
	
	param([switch] $LogHistory)
	
	$array = $OutputHistoryContext.Queue.ToArray()
	
	if (!$LogHistory) {
		$OutputHistoryContext.DisabledTemporary = $true
	}
	
	return $array
}

function Clear-OutputHistory {
	$OutputHistoryContext.Queue.Clear()
}

function Enable-OutputHistory {
	$OutputHistoryContext.Enabled = $true
}

function Disable-OutputHistory {
	$OutputHistoryContext.Enabled = $false
}