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Split-Path $MyInvocation.MyCommand.Path

Within a function

Split-Path $Script:MyInvocation.MyCommand.Path

$PSScriptRoot

if (!$PSScriptRoot) {$PSScriptRoot = Split-Path $Script:MyInvocation.MyCommand.Path}


Code Root

# $PWD.Path is the current directory (for when a function needs to run in or out of a script)
# $PSScriptRoot is the script directory (for in script only)
$CodeRoot = @($PSScriptRoot, $PWD.Path) | Where-Object { $_ } | Select-Object -First 1