Serverless 1.1.0 Dynamo Stream attachment (Until getting outputs within serverless.yml works)

.serverless_plugins|stream-setter.js

// jshint node: true, esversion: 6
'use strict';
const OUTPUT_NAME = 'MyTableStreamArn';
const FUNCTION_NAME = 'FUNCTIONNAMETOATTACHSTREAMTO';

class Deploy {
  constructor(serverless, options) {
    this.provider = 'aws';
		this.serverless = serverless;
		this.options = options;
    let AWS = this.serverless.getProvider('aws').sdk;
    this.cloudformation = new AWS.CloudFormation({region: this.options.region});
    this.lambda = new AWS.Lambda({region: this.options.region});
    this.hooks = {
      'after:deploy:deploy': this.afterDeploy.bind(this),
    };
  }

  afterDeploy() {
    let stackName = `${this.serverless.service.service}-${this.options.stage}`;
    let lambdaName = `${stackName}-${FUNCTION_NAME}`;

    this.cloudformation.describeStacks({StackName: stackName}, (err, data) => {
      if (err) {
        throw Error('Could not find the stack to retrieve the Dynamo Stream' + err);
      }

      let output = data.Stacks[0].Outputs.find((output) => {
        return output.OutputKey === OUTPUT_NAME;
      });

      if (output === undefined) {
        throw Error(`Could not find the ${OUTPUT_NAME} output`);
      }

      let eventSourceArn = output.OutputValue;

      console.log('Checking for existence of Event Source Mapping...');

      this.lambda.listEventSourceMappings(
        {
          EventSourceArn: eventSourceArn,
          FunctionName: lambdaName,
          MaxItems: 1
        },
        (err, data) => {
          if (err) {
            throw Error('Could not listEventSourceMappings', err);
          }

          if (data.EventSourceMappings.length == 1) {
            console.log('Event Source already set.');
            return;
          }

          console.log('Assigning Stream Arn: ', eventSourceArn);

          this.lambda.createEventSourceMapping({
             EventSourceArn: eventSourceArn,
             FunctionName: lambdaName,
             StartingPosition: 'LATEST',
             BatchSize: 1,
             Enabled: true
          }, (err, data) => {
            if (err) {
              throw Error('Could not createEventSourceMappings', err);
            }

            console.log('Done.');
          });
        }
      );
    });
  }
}

module.exports = Deploy;

serverless.yml

# ...
resources:
  Resources:
    MyTable:
      Type: AWS::DynamoDB::Table
      # ...
      StreamSpecification:
          StreamViewType: NEW_AND_OLD_IMAGES

  Outputs:
    MyTableStreamArn:
      Description: Arn of the DynamoDB Table Stream
      Value:
        Fn::GetAtt:
          - MyTable
          - StreamArn