How to specify an existing cognito user pool in servreless.yml?

Serverless Framework
18

This might help someone, especially for existing user pools:

  cognitoUserPool: {
    pool: "**POOL NAME (NOT ID, NOT ARN)**",
    trigger: "PreAuthentication",
    **existing: true,**
    // This flag (forceDeploy) has to be used in conjunction with the existing: true flag.
    // (https://www.serverless.com/framework/docs/providers/aws/events/cognito-user-pool#forcing-deploying-of-triggers)
    **forceDeploy: true**
  },