Automatically restore TypeScript starter SDK artifacts

[IEvangelist]

Description

Automatically restore TypeScript starter projects as part of aspire new so the generated .modules SDK is available immediately after creation.

Fixes #15169

This change updates the TypeScript starter template finalization flow to use the guest AppHost restore/code generation pipeline directly instead of spawning a nested CLI process. That keeps the restore behavior aligned with the existing guest project infrastructure, avoids the hanging child-process path seen in automation, and ensures the selected channel is written before restore/package resolution runs.

The implementation also keeps the generated project behavior correct by letting aspire restore own guest dependency installation and SDK generation rather than layering an extra template-specific npm install step on top. For validation, the change adds focused CLI-level coverage for the TypeScript starter restore path and updates the existing scenario assertion to verify the generated .modules/aspire.ts artifact without assuming emitted .js files.

Validation:

• dotnet test tests/Aspire.Cli.Tests/Aspire.Cli.Tests.csproj -- --filter-method "*.NewCommandWithTypeScriptStarterGeneratesSdkArtifacts" --filter-not-trait "quarantined=true" --filter-not-trait "outerloop=true"
• dotnet test tests/Aspire.Cli.Tests/Aspire.Cli.Tests.csproj -- --filter-class "*.NewCommandTests" --filter-not-trait "quarantined=true" --filter-not-trait "outerloop=true"
• dotnet test tests/Aspire.Cli.EndToEnd.Tests/Aspire.Cli.EndToEnd.Tests.csproj -- --filter-class "*.TypeScriptStarterTemplateTests" --filter-not-trait "quarantined=true" --filter-not-trait "outerloop=true" still fails locally in Docker terminal setup before the starter assertions run (the input device is not a TTY / container-ready timeout), so that scenario was not revalidated end-to-end on this machine.

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Link to aspire.dev issue:
      • New issue
  • No

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 15174

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 15174"

[Copilot]

Pull request overview

Updates the TypeScript starter template finalization so aspire new runs restore / SDK generation through the existing guest AppHost pipeline (instead of spawning a nested CLI / npm install), ensuring .modules artifacts are immediately available after creation.

Changes:

• Inject IAppHostProjectFactory into CliTemplateFactory and use guest AppHost restore/codegen for TypeScript starter finalization.
• Add CLI test coverage to validate .modules/aspire.ts generation and correct channel propagation before restore.
• Update E2E scenario assertions to check for generated .modules/aspire.ts instead of emitted .js files.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/Aspire.Cli.Tests/Utils/CliTestHelper.cs	Updates test service wiring to pass IAppHostProjectFactory into CliTemplateFactory.
tests/Aspire.Cli.Tests/Commands/NewCommandTests.cs	Adds a focused CLI test and test doubles to validate TypeScript starter restore/codegen behavior.
tests/Aspire.Cli.EndToEnd.Tests/TypeScriptStarterTemplateTests.cs	Adds a scenario assertion that .modules/aspire.ts exists after aspire new.
src/Aspire.Cli/Templating/CliTemplateFactory.cs	Removes nested-process execution helpers and stores injected IAppHostProjectFactory.
src/Aspire.Cli/Templating/CliTemplateFactory.TypeScriptStarterTemplate.cs	Switches TypeScript starter finalization to call guest restore/codegen and writes channel before restore.
src/Aspire.Cli/Projects/IGuestAppHostSdkGenerator.cs	Introduces an internal interface to represent guest SDK generation.
src/Aspire.Cli/Projects/GuestAppHostProject.cs	Implements IGuestAppHostSdkGenerator for the guest AppHost handler.

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