Print apphost exit message in debug console and add TypeScript Azure Functions playground sample

[adamint]

Description

This PR contains two changes:

1. Print a yellow informational message in the debug console when the AppHost process stops. When a debug session ends because the AppHost exits, a clearly-visible yellow message is now printed to the terminal/debug console to indicate the AppHost has stopped. This helps developers quickly notice that the AppHost has exited rather than silently disappearing.

2. Add a TypeScript Azure Functions end-to-end playground sample. Adds playground/AzureFunctionsEndToEnd.TypeScript, demonstrating a TypeScript AppHost using the JavaScript app model with:

   • Azure Functions app (Node.js v4 programming model) with queue, blob, blob container, and Event Hubs triggers
   • TypeScript Express API service that references the Functions app and Azure Storage/Event Hubs resources
   • The existing AzureFunctionsEndToEnd.AppHost (C#) is updated to rename Program.cs to AppHost.cs

---

I added the informational message to make it more clear what happened and where to find console output for the apphost - after creating the sample, I was initially confused why the debug session immediately stopped after the TS apphost started (caused by an exception in the apphost).

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
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
  • No
• Does the change require an update in our Aspire docs?
  • Yes
  • 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 -- 15155

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 15155"

[Copilot]

Pull request overview

This PR improves the VS Code Aspire debugging experience by surfacing an explicit termination message when the AppHost stops, and adds a new TypeScript-based Azure Functions end-to-end playground sample to demonstrate the JavaScript app model with Azure emulators.

Changes:

• Add a yellow informational message to the debug console when the AppHost debug session terminates (and isn’t being restarted).
• Add a new playground/AzureFunctionsEndToEnd.TypeScript sample including a TypeScript AppHost, a TypeScript Azure Functions app, and a TypeScript Express API service.
• Rename the C# Azure Functions E2E AppHost entrypoint from Program.cs to AppHost.cs.

Reviewed changes

Copilot reviewed 22 out of 27 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
playground/AzureFunctionsEndToEnd/AzureFunctionsEndToEnd.AppHost/AppHost.cs	Renamed/added C# AppHost entrypoint for the existing Azure Functions E2E playground.
playground/AzureFunctionsEndToEnd.TypeScript/TypeScriptFunctions/tsconfig.json	TypeScript compiler settings for the Functions app.
playground/AzureFunctionsEndToEnd.TypeScript/TypeScriptFunctions/src/functions/queueTrigger.ts	Adds a queue trigger function (storage queues).
playground/AzureFunctionsEndToEnd.TypeScript/TypeScriptFunctions/src/functions/httpTrigger.ts	Adds an HTTP-triggered function endpoint.
playground/AzureFunctionsEndToEnd.TypeScript/TypeScriptFunctions/src/functions/eventHubTrigger.ts	Adds an Event Hubs trigger function.
playground/AzureFunctionsEndToEnd.TypeScript/TypeScriptFunctions/src/functions/blobTrigger.ts	Adds a blob trigger with an output binding.
playground/AzureFunctionsEndToEnd.TypeScript/TypeScriptFunctions/package.json	Defines Functions app dependencies and scripts.
playground/AzureFunctionsEndToEnd.TypeScript/TypeScriptFunctions/package-lock.json	Lockfile for the Functions app.
playground/AzureFunctionsEndToEnd.TypeScript/TypeScriptFunctions/host.json	Azure Functions host configuration (logging/telemetry).
playground/AzureFunctionsEndToEnd.TypeScript/TypeScriptApiService/tsconfig.json	TypeScript compiler settings for the Express API service.
playground/AzureFunctionsEndToEnd.TypeScript/TypeScriptApiService/src/app.ts	Express API that publishes to queue/blob/event hubs and calls the Functions HTTP endpoint.
playground/AzureFunctionsEndToEnd.TypeScript/TypeScriptApiService/package.json	Defines API service dependencies and scripts (tsx dev workflow).
playground/AzureFunctionsEndToEnd.TypeScript/TypeScriptApiService/package-lock.json	Lockfile for the API service.
playground/AzureFunctionsEndToEnd.TypeScript/AppHost/tsconfig.json	TypeScript compiler settings for the TypeScript AppHost.
playground/AzureFunctionsEndToEnd.TypeScript/AppHost/package.json	AppHost Node/TS package definition and scripts.
playground/AzureFunctionsEndToEnd.TypeScript/AppHost/package-lock.json	Lockfile for the AppHost package.
playground/AzureFunctionsEndToEnd.TypeScript/AppHost/apphost.ts	TypeScript AppHost wiring storage + event hubs + JS apps and references.
playground/AzureFunctionsEndToEnd.TypeScript/AppHost/apphost.run.json	Run profile settings for the TypeScript AppHost sample.
playground/AzureFunctionsEndToEnd.TypeScript/AppHost/.modules/transport.ts	Generated ATS transport layer used by the TypeScript AppHost.
playground/AzureFunctionsEndToEnd.TypeScript/AppHost/.modules/base.ts	Generated ATS base types/helpers used by the TypeScript AppHost.
playground/AzureFunctionsEndToEnd.TypeScript/AppHost/.modules/.codegen-hash	Tracks generated module version/hash for the TypeScript AppHost.
playground/AzureFunctionsEndToEnd.TypeScript/.vscode/launch.json	Adds a VS Code launch configuration for the new sample.
extension/src/utils/AspireTerminalProvider.ts	Adds ANSI yellow color constant for styled output.
extension/src/loc/strings.ts	Adds localized string for AppHost-terminated debug console message.
extension/src/debugger/AspireDebugSession.ts	Emits a yellow info message to the debug console when the AppHost session terminates.
extension/package.nls.json	Adds localization entry for the new AppHost-terminated message.

Files not reviewed (3)

• playground/AzureFunctionsEndToEnd.TypeScript/AppHost/package-lock.json: Language not supported
• playground/AzureFunctionsEndToEnd.TypeScript/TypeScriptApiService/package-lock.json: Language not supported
• playground/AzureFunctionsEndToEnd.TypeScript/TypeScriptFunctions/package-lock.json: Language not supported

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[Copilot]

In the existing C# AzureFunctionsEndToEnd sample, the Event Hubs trigger uses the hub resource name as the connection setting prefix (Connection = "myhub"). Here the trigger is configured with connection: "eventhubs", which is the namespace resource name and likely won’t match the settings produced by .addHub("myhub") / .withReference(eventHub). Update the trigger to use the hub connection prefix that Aspire will provide (e.g., "myhub"), keeping the resource naming consistent across the sample.

Suggested change

	connection: "eventhubs",
	connection: "myhub",