!GetAtt assumes it's a string

[pauloancheta]

Getting an error when !GetAtt is throwing an error when it is passed an array:

# cfn-template.yaml
Resources:
  MyCodePipeline:
    Type: AWS::CodePipeline::Pipeline
    Properties:
      RoleArn: !GetAtt [MyRole, Arn]

error: ref.trim is not a function
error:  TypeError: ref.trim is not a function
    at maybeRewriteRef (/snapshot/iidy/lib/preprocess/index.js:827:30)
    at Object.exports.visitGetAtt (/snapshot/iidy/lib/preprocess/index.js:835:60)
    at visitYamlTagNode (/snapshot/iidy/lib/preprocess/index.js:645:24)
    at result (/snapshot/iidy/lib/preprocess/index.js:882:20)
    at visitNode (/snapshot/iidy/lib/preprocess/index.js:899:7)
    at visitMapNode (/snapshot/iidy/lib/preprocess/index.js:969:46)
    at visitPlainMap (/snapshot/iidy/lib/preprocess/index.js:947:16)
    at result (/snapshot/iidy/lib/preprocess/index.js:888:20)
    at visitNode (/snapshot/iidy/lib/preprocess/index.js:899:7)
    at visitMapNode (/snapshot/iidy/lib/preprocess/index.js:969:46)
    at visitPlainMap (/snapshot/iidy/lib/preprocess/index.js:947:16)
    at result (/snapshot/iidy/lib/preprocess/index.js:888:20)
    at visitNode (/snapshot/iidy/lib/preprocess/index.js:899:7)
    at _.fromPairs._.map (/snapshot/iidy/lib/preprocess/index.js:576:24)
    at arrayMap (/snapshot/iidy/node_modules/lodash/lodash.js:660:23)
    at Function.map (/snapshot/iidy/node_modules/lodash/lodash.js:9571:14)

As a workaround, I'm using a string instead

Resources:
  MyCodePipeline:
    Properties:
      RoleArn: !GetAtt MyRole.Arn