Get the texts contained in the clipboard history.

ClipboardHistory.ps1

<#
Get-ClipboardHistory: Get the texts contained in the clipboard history.
Clear-ClipboardHistory: Clearing the clipboard history

In PowerShell 7.1 or later, use the following command to install Microsoft.Windows.SDK.NET.Ref with administrative privileges.
Find-Package -ProviderName NuGet -Source https://www.nuget.org/api/v2 -Name Microsoft.Windows.SDK.NET.Ref | Install-Package
#>

$needsSDK = $PSVersionTable.PSVersion -ge "7.1.0" 

if ($needsSDK)
{
    $sdkLib = Split-Path -Path (
        Get-Package -ProviderName NuGet -Name Microsoft.Windows.SDK.NET.Ref |
            Select-Object -ExpandProperty Source) -Parent |
        Join-Path -ChildPath "\lib"
    Add-Type -Path "$sdkLib\Microsoft.Windows.SDK.NET.dll"
    Add-Type -Path "$sdkLib\WinRT.Runtime.dll"
}
else
{
    Add-Type -AssemblyName System.Runtime.WindowsRuntime
}

$clipboard = if ($needsSDK)
{
    [Windows.ApplicationModel.DataTransfer.Clipboard]
}
else
{
    [Windows.ApplicationModel.DataTransfer.Clipboard, Windows.ApplicationModel.DataTransfer, ContentType = WindowsRuntime]
}

function await
{
    param($AsyncTask, [Type]$ResultType)

    $method = [WindowsRuntimeSystemExtensions].GetMember("GetAwaiter") |
        where {$_.GetParameters()[0].ParameterType.Name -eq 'IAsyncOperation`1'} |
        select -First 1
    $method.MakeGenericMethod($ResultType).
    Invoke($null, @($AsyncTask)).
    GetResult()
}

function Get-ClipboardHistory
{
    $type = if ($script:needsSDK)
    {
        [Windows.ApplicationModel.DataTransfer.ClipboardHistoryItemsResult]
    }
    else
    {
        [Windows.ApplicationModel.DataTransfer.ClipboardHistoryItemsResult, Windows.ApplicationModel.DataTransfer, ContentType = WindowsRuntime]
    }

    $result = await $script:clipboard::GetHistoryItemsAsync() $type
    
    $outItems = if ($script:needsSDK)
    {
        @($result.Items.AdditionalTypeData.Values)
    }
    else
    {
        @($result.Items)
    }

    $outItems |
        where {$_.Content.Contains("Text")} |
        foreach {await $_.Content.GetTextAsync() ([string])}
}

function Clear-ClipboardHistory
{
    $script:clipboard::ClearHistory() | Out-Null
}