serverless.yml

provider:
  name                                    : aws
  region                                  : us-east-1
  runtime                                 : nodejs8.10
  stage                                   : ${opt:stage, 'dev'}
  apiname                                 : ${opt:apiname, 'chatql'}_${self:provider.stage}
  environment:
    GRAPHQL_API                           : { Fn::GetAtt: [ GraphQlApi, GraphQLUrl ] }
    REGION                                : ${self:provider.region}

functions:
  postAuthentication:
    handler                               : cognito.postauth
    role                                  : PostAuthenticationRole
    events:
      - cognitoUserPool:
          pool                            : MyPool
          trigger                         : PostAuthentication