serverless.yml

service: email-api

plugins:
  - serverless-webpack
  - serverless-offline #must be last

provider:
  name: aws
  runtime: nodejs10.x
  stage: dev
  region: us-east-1
  iamRoleStatements:
    - Effect: 'Allow'
      Action:
        - 'ses:SendEmail'
        - 'ses:SendRawEmail'
        - 'sns:Publish'
        - "sqs:SendMessage"
        - "sqs:GetQueueUrl"
        - "sqs:ListQueues"
        - "sqs:ReceiveMessage"
        - "sqs:DeleteMessage"
        - "sqs:GetQueueAttributes"
        - "lambda:InvokeFunction"
        - "lambda:InvokeAsync"
      Resource: '*'

functions:
  app:
    handler: index.handler
    events:
      - http:
          path: /
          method: post
  email-failures:
    handler: email-failures.handler
    reservedConcurrency: 3
    events:
      - sqs:
          arn:
            Fn::GetAtt:
              - EmailFailureQueue
              - Arn

resources:
  Resources:
    EmailFailureTopic:
      Type: AWS::SNS::Topic
      Properties:
        TopicName: ses-failure-topic-${self:provider.stage}
    EmailFailureQueue:
      Type: "AWS::SQS::Queue"
      Properties:
        QueueName: "EmailFailureQueue-${self:provider.stage}"
    EmailFailureQueueSubscription:
      Type: AWS::SNS::Subscription
      Properties:
        TopicArn: !Ref EmailFailureTopic
        Endpoint: !GetAtt
          - EmailFailureQueue
          - Arn
        Protocol: sqs
        RawMessageDelivery: 'true'

    SQSSNSPolicy:
      Type: AWS::SQS::QueuePolicy
      Properties:
        PolicyDocument:
          Version: "2012-10-17"
          Id: "PushEmailFailureToSQSPolicy"
          Statement:
            - Sid: "allow-sns-to-send-message-to-sqs"
              Effect: Allow
              Principal: '*'
              Action:
                - 'sqs:SendMessage'
              Resource: !GetAtt 'EmailFailureQueue.Arn'
              Condition:
                ArnEquals:
                  aws:SourceArn: !Ref 'EmailFailureTopic'
        Queues:
          - !Ref EmailFailureQueue

Doesn't work. Visual Studio throws error at !Ref or !GetAtt