Skill

powershell-module-design

PowerShell Core module design — .psd1/.psm1 manifests, Public/Private/Handlers folder structure, dot-sourcing order, CmdletBinding, Set-StrictMode, cross-platform rules (no Write-Host, Join-Path), PSScriptAnalyzer. USE FOR: structuring new PowerShell modules, implementing cross-platform functions, writing CI scripts. DO NOT USE FOR: PowerShell tests (use pester-patterns) or GitHub Actions workflows (use github-actions-patterns).

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This skill uses the workspace's default tool permissions.

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```powershell

SKILL.md

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Last CommitMar 31, 2026

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PowerShell Module Design

Datei-Header (Pflicht an jeder .ps1)

#Requires -Version 7.4

Script-Initialisierung (Pflicht)

Set-StrictMode -Version Latest
$ErrorActionPreference = 'Stop'

Verzeichnisstruktur

ModuleName/
├── ModuleName.psd1              # Manifest
├── ModuleName.psm1              # Root Module (Dot-Sourcing)
├── Functions/
│   ├── Public/                  # Exportierte Functions
│   └── Private/
│       └── Handlers/            # Sub-Kategorie für Spezialisten
├── Tests/
│   ├── ModuleName.Feature.Tests.ps1
│   └── FunctionName.Tests.ps1
├── .github/
│   ├── scripts/                 # CI-Hilfsscripts
│   ├── workflows/
│   └── linters/
└── action.yml                   # GitHub Action Interface (optional)

Root Module: Dot-Sourcing-Reihenfolge

Handlers → Private → Public (Abhängigkeitsrichtung):

$script:ModuleRoot = $PSScriptRoot
$handlerFunctions = @(Get-ChildItem -Path (Join-Path $script:ModuleRoot 'Functions' 'Private' 'Handlers') -Filter '*.ps1' -ErrorAction SilentlyContinue)
foreach ($file in $handlerFunctions) {
    try { . $file.FullName; Write-Verbose "Loaded handler: $($file.BaseName)" }
    catch { Write-Error "Failed to load '$($file.Name)': $_"; throw }
}
# dann Private, dann Public analog

⛔ Cross-Platform Hard Rules (überall, auch CI)

Write-Host → Write-Output, Write-Verbose, Write-Information
"$root\sub" → Join-Path $root 'sub'
$env:USERPROFILE → $env:HOME
\r\n → [Environment]::NewLine
Get-WmiObject → Get-CimInstance
Encoding: immer -Encoding utf8
Null-Check: $null -eq $variable (nicht umgekehrt)

GitHub Actions Output-Pattern

if ($env:GITHUB_OUTPUT) {
    "output-name=$value" | Out-File -FilePath $env:GITHUB_OUTPUT -Append
}

Function-Design

Approved Verbs, [CmdletBinding()], Parameter-Validation
Comment-Based Help: .SYNOPSIS, .DESCRIPTION, .PARAMETER, .EXAMPLE
ShouldProcess bei destruktiven Operationen
Einheitliche Result-Objects:

[PSCustomObject]@{ Passed = $true; Skipped = $false; Message = '...' }