Customizing generated container-app bicep from a TypeScript AppHost

[Anton Sokolovskyi (antsok)]

I need to set ACA properties that Aspire's generated bicep hardcodes — specifically activeRevisionsMode (emitted as 'Single'), also maxReplicas / terminationGracePeriodSeconds.

Using the TypeScript AppHost with CLI 13.4.6. What I've hit:

• publishAsAzureContainerApp((infra, app) => ...) runs, but the app handle only projects configureScale / configureCustomDomain; setting app.configuration.activeRevisionsMode is a silent no-op.

• configureInfrastructure exists in the TS bindings, but the AzureResourceInfrastructure object has no getProvisionableResources() (the docs at aspire.dev/integrations/cloud/azure/customize-resources say to use it — it's absent from the generated bindings). I believe this is Polyglot ConfigureInfrastructure for Azure resources #14828.

• Eventing works (subscribeBeforePublish/subscribeAfterPublish both fire, even under aspire deploy), but event.model() returns inert IResource handles, and the synthesized container-app resource never appears in the model.

• Last resort: an subscribeAfterPublish callback that patches the emitted .bicep on disk. This works for aspire publish, but under aspire deploy the --output-path directory is never even created — deploy apparently provisions the templates in memory, so there's nothing to patch.

Questions:

(1) Is there any supported way on 13.4.6 to override a generated container-app property from a TS AppHost?

(2) Is aspire deploy ever going to read bicep from the artifact path, or is in-memory provisioning by design?

(3) Is #14828 (polyglot ConfigureInfrastructure, milestone 13.5) the right issue to watch, or is there something sooner?