CSOM challenge - SharePoint Online

Hi,

Check the below script. To check files for "Manage files that have no checked in version", you need to use the condition : 

$file.MajorVersion -eq "1" -and $file.Level -eq "Checkout"

This script uses SPO PnP also.

$cred=Get-Credential
$UName=$cred.UserName.ToString()
$Pass =$cred.GetNetworkCredential().Password
$SiteURL = "https:// tenantname.sharepoint.com/sites/testsite2"
$DocLibName = "Documents"

connect-pnponline -Url $SiteURL -Credentials $cred

$loadInfo1 = [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client")
$loadInfo2 = [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client.Runtime")
$Password = $Pass | ConvertTo-SecureString -AsPlainText -Force

#Bind to site collection
$Context = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
$Creds = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($UName,$Password)
$Context.Credentials = $Creds
#Retrieve list
$List = $Context.Web.Lists.GetByTitle($DocLibName)
$Context.Load($List)
$Context.ExecuteQuery()

$Allfiles= $List.RootFolder.Files
$Context.Load($Allfiles)
$Context.ExecuteQuery()
foreach( $file in $Allfiles){

If($file.MajorVersion -eq "1" -and $file.Level -eq "Checkout")
{
Set-PnPFileCheckedIn -Url $file.ServerRelativeUrl
Write-Host $file.Name "Checked-in "
}
}