POC for powershell delegateish scriptblock with context. Possible use as some kind of builder pattern

powershell_context_concept.ps1

class Context {
    $Data
}

filter require_context { 
    if( $_ -is [Context]) {
        $_
    } else {
        throw "missing context"
    }
}

function parent {
    param([scriptblock]$children)
    $children.InvokeReturnAsIs([Context]@{Data ="data"})|Write-Output
}

parent {
    [Context]$c = $args[0]|require_context
    $c.Data+"child1"
    $c.Data+"child2"
}