There is some confusion in the docs here https://docs.serverless-stack.com/constructs/Topic#importing-an-existing-topic

import { Topic } from "@aws-cdk/aws-sns";

new Topic(this, "Topic", {
  subscribers: ["src/subscriber1.main", "src/subscriber2.main"],
  snsTopic: Topic.fromTopicArn(this, "MySnsTopic", topicArn),
});

the

new Topic

is referencing

Topic

from

sst

and the

Topic.fromTopicArn

is referencing

Topic

from

aws-sns

but both of them have the same variable name in the code

Nice catch Aram! Updated the doc.