CloudFormation template excerpt - lambda function

cloudformation_lambda_function.yaml

WebPipelineNotifyFunction:
  Type: AWS::Lambda::Function
  Properties:
    Code:
      ZipFile: |
          var SNS = require('aws-sdk/clients/sns')
          var sns = new SNS()

          exports.handler = async (event) => {
            console.log(JSON.stringify(event))
            const params = {
              Message: `Deploy of ${process.env.BRANCH} ${event.detail.state}`,
              TopicArn: process.env.TOPIC_ARN,
              Subject: `Deploy ${event.detail.state}`
            }
            console.log(JSON.stringify(params))
            return await sns.publish(params).promise()
          }
    Description: Notifies of deploys with SMS and email
    Environment:
      Variables:
        TOPIC_ARN: !Ref DevNotifyTopic
        BRANCH: !Ref DeployBranch
    Handler: index.handler
    Role: !GetAtt LambdaServiceRole.Arn
    Runtime: nodejs8.10
    Timeout: 10