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serverless.ymlで設定値を条件分岐したい

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cloudformationではよく!Ifとか!Equalを使って条件分岐書いてたのですが、
どうやらserverless.ymlではその記法ができないそうなので。。。

ex)
develop環境の場合にはdev, production環境の場合にはprodとなるような省略名の設定値'envShorten'を作りたい

serverless.yml

provider:
  name: aws
  runtime: python3.6
  region: ap-northeast-1
  stage: ${opt:stage, 'develop'}
  conf:
    #hogehoge
  iamRoleStatements:
    #hogehoge

  environment:
    ENVIRONMENT_TYPE: ${self:provider.stage}

plugins:
  #hogehoge

custom:
  envShorten:
    develop: dev
    production: prod

上記のような書き方によって、!Ifなどを使わないで条件分岐を実現できる。
上記のyml内で、実際に値を取りに行くときは

${self:custom.envShorten.${self:provider.stage}}

と指定してやれば良い

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