PSCredentialStore/src/Private/Get-TempDir.ps1

function Get-TempDir {
    <#
    .SYNOPSIS
        Returns the valid temp dir of the current OS

    .DESCRIPTION
        Returns the valid temp dir of the current OS.

    .INPUTS
        [None]
    .OUTPUTS
        [string]

    .EXAMPLE
        Get-TempDir
    #>

    [CmdletBinding()]
    [OutputType([string])]
    param ()

    begin {}

    process {
        if ($IsLinux) {
            return (Resolve-Path -Path '/tmp/').Path
        }
        if ($IsMacOS) {
            return (Resolve-Path -Path '/tmp/').Path
        }
        elseif (
            ($isWindows) -or
            ($PSVersionTable.PSVersion.Major -lt 6) -or
            ($PSVersionTable.PSEdition -eq 'Desktop')
        ) {
            return (Resolve-Path -Path $env:TEMP).Path
        }
    }

    end {}
}