lib/plugins/aws/package/compile/layers/index.js/AwsCompileLayers/cfLambdaLayerTemplate
class AwsCompileLayers:  cfLambdaLayerTemplate() {
    return {
      Type: 'AWS::Lambda::LayerVersion',
      Properties: {
        Content: {
          S3Bucket: {
            Ref: 'ServerlessDeploymentBucket',
          },
          S3Key: 'S3Key',
        },
        LayerName: 'LayerName',
      },
    };
  }