An excerpt of a serverless configuration file

serverless.yml

provider:
  region: eu-west-1
  stackName: ${self:service.name}-${self:provider.stage, env:STAGE, 'dev'}
  environment:
    STAGE: ${self:provider.stage, env:STAGE, 'dev'}
    DOMAIN_URL: { "Fn::Join" : ["", [" https://#{ApiGatewayRestApi}", ".execute-api.eu-west-1.amazonaws.com/${self:provider.stage, env:STAGE, 'dev'}" ] ]  }
    TABLE_NAME: ${self:service}-${self:provider.stage, env:STAGE, 'dev'}-data-layer
  iamRoleStatements:
    - Effect: Allow
      Action:
        - s3:Get*
        - s3:List*
      Resource: "*"
  stage: dev
  stage_path: dev
  name: aws
  runtime: nodejs8.10
  
functions:
  server:
    handler: build/server/server.default
    events:
      - http: ANY /
      - http: 'ANY {proxy+}'
      - cors: true

resources:
  Resources:
    StaticBucket:
      Type: AWS::S3::Bucket
      Properties:
        BucketName: ${self:provider.staticBucket}
        AccessControl: PublicRead
        WebsiteConfiguration:
          IndexDocument: index.html
        CorsConfiguration:
          CorsRules:
            - AllowedMethods:
                - GET
              AllowedOrigins:
                - "*"
              AllowedHeaders:
                - "*"