call locally installed npm binary from powershell

npm-do.ps1

function npm_do { 
    if ($args.Count -lt 1) {
        throw "At least one argument is required"
    }
    $npmBinFolder = $(npm bin)
    $exePath = -join($npmBinFolder, "\", $args[0], ".ps1")
    if ($args.Count -eq 1) {
        . $exePath
    } else {
        $exeArgs = $args[1..($args.length - 1)]
        . $exePath $exeArgs
    }
}

Set-Alias npm-do npm_do