functions/SPClientType/Add-SPClientType.ps1

#Requires -Version 3.0

# Add-SPClientType.ps1
#
# Copyright (c) 2017 karamem0
#
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# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

function Add-SPClientType {

<#
.SYNOPSIS
  Loads SharePoint Client Components assemblies.
.DESCRIPTION
  By default, this cmdlet loads assemblies below.
    - %COMMONPROGRAMFILES%\Microsoft Shared\Web Server Extensions\<VERSION>\ISAPI
      - Microsoft.SharePoint.Client.dll
      - Microsoft.SharePoint.Client.Runtime.dll
.PARAMETER Version
  Indicates the version of SharePoint Client Components.
  The version must be "15" (SharePoint 2013), or "16" (SharePoint 2016).
  If not specified, uses the latest version.
.PARAMETER LiteralPath
  Indicates the path that locates SharePoint Client Components.
#>


    [CmdletBinding(DefaultParameterSetName = 'Version')]
    param (
        [Parameter(Mandatory = $false, ParameterSetName = 'Version')]
        [ValidateSet('15', '16')]
        [string]
        $Version,
        [Parameter(Mandatory = $true, ParameterSetName = 'LiteralPath')]
        [string]
        $LiteralPath
    )

    process {
        if ($PSCmdlet.ParameterSetName -eq 'Version') {
            $path = Join-Path $Env:CommonProgramFiles 'Microsoft Shared\Web Server Extensions'
            if (-not (Test-Path $path)) {
                throw 'Cannot find SharePoint Client Component assemblies.'
            }
            if (-not (Get-ChildItem $path)) {
                throw 'Cannot find SharePoint Client Component assemblies.'
            }
            if ([string]::IsNullOrEmpty($Version)) {
                $Version = [string](Get-ChildItem $path | Sort-Object -Descending)[0]
            }
            $path = Join-Path $path $Version
            $path = Join-Path $path 'ISAPI'
        }
        if ($PSCmdlet.ParameterSetName -eq 'LiteralPath') {
            if (-not (Test-Path $LiteralPath)) {
                throw 'Cannot find SharePoint Client Component assemblies.'
            }
            $path = $LiteralPath
        }
        Add-Type -Path (Join-Path $path 'Microsoft.SharePoint.Client.dll')
        Add-Type -Path (Join-Path $path 'Microsoft.SharePoint.Client.Runtime.dll')
    }

}