I am working on an existing project, built with serverless and manual deployment. Here, I want to create

Congnito

instance using

Auth

. But for the production stage

cognito

instance has already been created manually. What is the best way to create

Auth

instance such that, in other

stage

, sst manages creation of

cognito

but in production stage it uses existing

cognito

instance. Even better if there is a way to include existing

cognito

as if it was created using SST, so that infra code is uniform across all the stages.

Conditionally-creating resources within a stack, although not the best approach, can be achieve using

app.stage

and or

app.IS_LOCAL

. Another approach is to extract stateful resources, like your Cognito pool, into another stack. In this case, you would either (1) conditionally-create the stack using the same technique as before or (2) use SSM or env vars to shared information across stacks, like pool IDs and such.

I found the blog which is more closer to what I am expecting. Let me try that. https://aws.amazon.com/blogs/aws/new-import-existing-resources-into-a-cloudformation-stack/