functions/SPClientFolder/ConvertTo-SPClientFolder.ps1

#Requires -Version 3.0

# ConvertTo-SPClientFolder.ps1
#
# Copyright (c) 2017 karamem0
#
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# SOFTWARE.

function ConvertTo-SPClientFolder {

<#
.SYNOPSIS
  Converts list item to folder.
.DESCRIPTION
  The ConvertTo-SPClientFolder function converts the list item to folder.
.PARAMETER ClientContext
  Indicates the client context. If not specified, uses default context.
.PARAMETER ListItem
  Indicates the list item.
.PARAMETER Retrievals
  Indicates the data retrieval expression.
.EXAMPLE
  ConvertTo-SPClientFolder $item
#>


    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $false)]
        [Microsoft.SharePoint.Client.ClientContext]
        $ClientContext = $SPClient.ClientContext,
        [Parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true)]
        [Microsoft.SharePoint.Client.ListItem]
        $ListItem,
        [Parameter(Mandatory = $false)]
        [string]
        $Retrievals
    )

    process {
        if ($ClientContext -eq $null) {
            throw "Cannot bind argument to parameter 'ClientContext' because it is null."
        }
        $ClientObject = $ListItem.Folder
        Invoke-SPClientLoadQuery `
            -ClientContext $ClientContext `
            -ClientObject $ClientObject `
            -Retrievals $Retrievals
        if ($ClientObject.ServerObjectIsNull) {
            throw 'Cannot convert list item to folder because it is not a folder.'
        }
        Write-Output $ClientObject
    }

}