The first step is to understand that a cmdlet can output one or more types of objects. For instance, in our case, Get-ChildItem output System.IO.DirectoryInfo as well as System.IO.FileInfo. Let us learn to work with these guys.

1. Get the type of the object returned by the cmdlet.

PS> Get-ChildItem | Get-Member | Select-Object TypeName -Unique

2. There are two types returned. We created the custom members in the second type. Assign this to a variable.

PS> $TypeData = Get-ChildItem | Get-Member | Select-Object -ExpandProperty TypeName -Unique -Last 1

3. Get the type data information. Expand its members to see if the custom members are shown.

PS> Get-TypeData -TypeName $TypeData | Select-Object -ExpandProperty Members

4. Now, remove the type data.

PS> Remove-TypeData -TypeName $TypeData