Hello, I’m working on migrating a serverless framework service to SST and am struggling to figure out how to reference already existing resources within SST. For example, in my serverless.yml file, I reference stage dependent ddb tables like so:

provider:
  environment:
    myTableName: ${cf:myOtherService-${self:provider.stage}.TableName}

Then I dereference

myTableName

from

process.env

within the lambda. What is the best way to do this within SST?

One way is to import a table using its ARN. https://docs.serverless-stack.com/constructs/Table#importing-an-existing-table

Is there a recommended way to do this that dynamically references the correct ARN depending on the stage?

A few ways come to mind. 1. Define

.env

files for each environment (stage/prod/etc) and list the ARNs there. You could then import based on the value in the environment variable. For example:

new Table(this, "Table", {
  dynamodbTable:dynamodb.Table.fromTableArn(this, "ImportedTable", process.env.TableArn), 
});

More info here. 2. Save the ARNs to a shared environment like AWS Parameter Store with names that are defined by stage. For example, you could have parameters named

/prod/my_service/table_arn

,

/stage/my_service/table_arn

Thanks Seth! The staged .env files seems like the route to go for our use case

Yeah, it's a pretty nice feature