optional/Get-GenericArgumentCompleter.ps1

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if (-not (Get-Command -Name Register-ArgumentCompleter -ErrorAction Ignore)) {
    Function Get-GenericArgumentCompleter {
        param (
            [string]$name,
            [object]$collection
        )

        Register-ArgumentCompleter -ParameterName $name -ScriptBlock {
            param (
                $commandName,
                $parameterName,
                $wordToComplete,
                $commandAst,
                $fakeBoundParameter
            )

            if ($collection) {
                foreach ($item in $collection) {
                    New-CompletionResult -CompletionText $item -ToolTip $item
                }
            }
        }
    }
}