ConvertTo-Hashtable.ps1

<# Object initializer syntax ( $config = @{ … } ) produces a Hashtable.
   Unlike this, the ConvertFrom-Json function returns PSCustomObject instead.
   This may be inconvenient if you keep configuration both in JSON files and in PS1 files.

   To keep uniformity, convert object to Hashtable using this function
#>
function ConvertTo-Hashtable {
    param(
        [Parameter(ValueFromPipeline=$true, ValueFromPipelineByPropertyName=$true)]
        $InputObject
    )
    # handle collections of PSObject
    if ($InputObject -is [System.Collections.IEnumerable] -and $InputObject -isnot [String]) {
        $collection = @(
            foreach ($object in $InputObject) {
                ConvertTo-Hashtable $object
            }
        )
        Write-Output -NoEnumerate $collection
    }
    # handle PSObjects
    elseif ($InputObject -is [PSObject]) {
        $h = @{}
        $InputObject.PSObject.Properties | %{
            $h[$_.Name] = ConvertTo-Hashtable $_.Value
        }
        return $h
    }
    else {
        return $InputObject
    }
}