Implementing a Microsoft .NET Template Engine Package Provider as a Powershell Class - Just because you can doesn't mean you should

PowerShellModuleTemplateProvider.class.ps1

using namespace System
using namespace System.Collections.Generic
using namespace System.Threading
using namespace System.Threading.Tasks
using namespace Microsoft.TemplateEngine.Abstractions
using namespace Microsoft.TemplateEngine.Abstractions.TemplatePackage

class PowerShellModuleTemplatePackageProvider : ITemplatePackageProvider {
    [ITemplatePackageProviderFactory]$Factory

    PowerShellModuleTemplatePackageProvider(
        [ITemplatePackageProviderFactory]$Factory
    ) {
        $this.Factory = $Factory
    }

    #TODO: We could potentially rig a filewatcher up to this or some way to detect module changes
    [void] add_TemplatePackagesChanged([Action] $value) {
        #Nothing needs to happen here, maybe a log?
    }

    [void] remove_TemplatePackagesChanged([Action] $value) {
        #Nothing needs to happen here, maybe a log?
    }

    [Task[IReadOnlyList[ITemplatePackage]]] GetAllTemplatePackagesAsync([CancellationToken] $cancellationToken) {
        [Console]::WriteLine('GetMortarPackages')
        $folder = Get-Item 'C:\Users\JGrote\Projects\Mortar\Mortar.Templates\01-simple-module'
        [List[TemplatePackage]]$result = @(
            [TemplatePackage]::new($this, $folder.FullName, $folder.LastWriteTimeUtc)
        )
        return [Task]::FromResult[IReadOnlyList[ITemplatePackage]]($result)
    }
}

class PowerShellModuleTemplatePackageProviderFactory : ITemplatePackageProviderFactory {
    #Used FakeFactory as reference: https://github.dev/dotnet/templating/blob/4a50caebcb5b2db834bc7ea51be5f36bdc126876/test/Microsoft.TemplateEngine.Edge.UnitTests/TemplatePackageManagerTests.cs#L309-L310
    [guid]$Id = 'fdd52a92-307a-4a93-ad0c-23107f40add1'
    [string]$DisplayName = 'Mortar - PowerShell Module Templates'

    #We may need this in order to trigger events later on
    [List[PowerShellModuleTemplatePackageProvider]]$allCreatedProviders = @()

    [ITemplatePackageProvider] CreateProvider([IEngineEnvironmentSettings] $settings) {
        $provider = [PowerShellModuleTemplatePackageProvider]::new($this)
        $this.allCreatedProviders.Add($provider)
        return $provider
    }
}