src/Get-EnvVarPathItem.ps1

#!/usr/bin/env pwsh
$ErrorActionPreference = "Stop"
Set-StrictMode -Version Latest


function Get-EnvVarPathItem() {
    [CmdletBinding(DefaultParameterSetName = "ProcessScopeForValue")]
    param(
        [Parameter(Mandatory=$true, ParameterSetName="MachineScopeForValue", Position=0)]
        [switch] $Machine,

        [Parameter(Mandatory=$true, ParameterSetName="ProcessScopeForValue", Position=0)]
        [switch] $Process,

        [Parameter(Mandatory=$true, ParameterSetName="UserScopeForValue", Position=0)]
        [switch] $User,

        [Parameter(Mandatory=$true, ParameterSetName="ScopeValueForValue", Position=0)]
        [System.EnvironmentVariableTarget] $Scope,

        [Parameter(Mandatory=$true, Position=1)]
        [ValidateLength(1, [int]::MaxValue)]
        [string] $Name
    )
    Begin {
        if ($Machine -and $Machine.IsPresent) {
            $Scope = [System.EnvironmentVariableTarget]::Machine
        } elseif ($Process -and $Process.IsPresent) {
            $Scope = [System.EnvironmentVariableTarget]::Process
        } elseif ($User -and $User.IsPresent) {
            $Scope = [System.EnvironmentVariableTarget]::User
        }

        if (-not [System.EnvironmentVariableTarget]::IsDefined($Scope)) {
            throw "Unrecognized EnvironmentVariableTarget '$Scope'"
        }
    }
    Process {
        [string] $extantPath = Get-EnvVar -Scope $Scope -Name $Name -Value
        [string[]] $pathItems = $extantPath -split [System.IO.Path]::PathSeparator

        foreach ($pathItem in $pathItems) {
            Write-Output $pathItem
        }
    }
}