Reorder fields in a SharePoint content type using csom PowerShell

Reorder-ContentTypeFields.ps1

function Reorder-ContentTypeFields()
{
    param(
        [Parameter(Mandatory=$true)][string]$url,
        [Parameter(Mandatory=$false)][System.Net.NetworkCredential]$credentials,
        [Parameter(Mandatory=$true)][string]$ContentTypeName
    )
    
    begin{
        try
        {
            #get Client Object
            $Context = New-Object Microsoft.SharePoint.Client.ClientContext($url) 
            $Context.Credentials = $Credentials 

            #Load web object
            $web = $Context.Web
            $Context.Load($web)
            $Context.ExecuteQuery()

        }
        catch
        {
            Write-Host "Error while getting context. Error -->> "  + $_.Exception.Message -ForegroundColor Red
        }
    }
    process{
        try
        {
            $contentTypes = $Context.Site.RootWeb.ContentTypes
            $Context.Load($contentTypes)
            $Context.ExecuteQuery()
            $contentType = $contentTypes | Where {$_.Name -eq $ContentTypeName}
            $viewFields = New-Object System.Collections.Specialized.StringCollection  
            #Col1 = Internal Name of a field
            $viewFields.Add("Col1")
            $viewFields.Add("Col2")
            $viewFields.Add("Col3")
            
            
            $contentType.FieldLinks.Reorder($viewFields)
            $contentType.Update($true)
            $Context.Load($contentType)
            $Context.ExecuteQuery()
            
            Write-Host "Fields reordered successfully" -ForegroundColor Green
        }
        catch
        {
            Write-Host ("Error while reordering fields in contet type. Error -->> " + $_.Exception.Message) -ForegroundColor Red
        }
    }
    end{
        $Context.Dispose()
    }

    
}