Add whatif and export support NpmDsc (#132)

Author: Gijsreyn

.github/actions/spelling/allow.txt

@@ -65,3 +65,6 @@ videojs
 vsconfig
 websites
 wekyb
+Hmmss
+MMdd
+MMdd

.github/actions/spelling/expect/generic_terms.txt

@@ -18,4 +18,5 @@ sortby
 ssh
 usr
 versioning
-VGpu
+VGpu
+ADDLOCAL

.github/actions/spelling/expect/software.txt

@@ -4,4 +4,5 @@ dotnet
 dotnettool
 NUnit
 reportgenerator
-markdownlint
+markdownlint
+msiexec

resources/Help/NpmDsc/NpmPackage.md

@@ -0,0 +1,54 @@
+---
+external help file: NpmDsc.psm1-Help.xml
+Module Name: NpmDsc
+ms.date: 11/16/2024
+online version:
+schema: 2.0.0
+title: NpmPackage
+---
+
+# NpmPackage
+
+## SYNOPSIS
+
+The `NpmPackage` DSC Resource allows you to manage the installation, update, and removal of npm packages. This resource ensures that the specified npm package is in the desired state.
+
+## DESCRIPTION
+
+The `NpmPackage` DSC Resource allows you to manage the installation, update, and removal of npm packages. This resource ensures that the specified npm package is in the desired state.
+
+## PARAMETERS
+
+| **Parameter**      | **Attribute**  | **DataType** | **Description**                                                                                                                    | **Allowed Values**                        |
+| ------------------ | -------------- | ------------ | ---------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------- |
+| `Ensure`           | Optional       | String       | Specifies whether the npm package should be present or absent. The default value is `Present`.                                     | `Present`, `Absent`                       |
+| `Name`             | Key, Mandatory | String       | The name of the npm package to manage. This is a key property.                                                                     | Any valid npm package name                |
+| `Version`          | Optional       | String       | The version of the npm package to install. If not specified, the latest version will be installed.                                 | Any valid version string (e.g., `4.17.1`) |
+| `PackageDirectory` | Optional       | String       | The directory where the npm package should be installed. If not specified, the package will be installed in the current directory. | Any valid directory path                  |
+| `Global`           | Optional       | Boolean      | Indicates whether the npm package should be installed globally. The default value is `$false`.                                     | `$true`, `$false`                         |
+
+## EXAMPLES
+
+### EXAMPLE 1 - Install React package in default directory
+
+```powershell
+PS C:\> Invoke-DscResource -ModuleName NpmDsc -Name NpmPackage -Method Set -Property @{ Name = 'react' }
+
+# This example installs the npm package 'react' in the current directory.
+```
+
+### EXAMPLE 2 - Install Babel package in global directory
+
+```powershell
+PS C:\> Invoke-DscResource -ModuleName NpmDsc -Name NpmPackage -Method Set -Property @{ Name = 'babel'; Global = $true }
+
+# This example installs the npm package 'babel' globally.
+```
+
+### EXAMPLE 3 - Get WhatIf result for React package
+
+```powershell
+PS C:\> ([NpmPackage]@{ Name = 'react' }).WhatIf()
+
+# This example returns the whatif result for installing the npm package 'react'. Note: This does not actually install the package and requires the module to be imported using 'using module <moduleName>'.
+```