swf-runtime 1.0.0-alpha9

Runtime engine for Serverless Workflow DSL — execute, validate, and orchestrate workflows
Documentation 
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document:
  dsl: '1.0.0'
  namespace: test
  name: expression-array-length
  version: '0.1.0'
do:
  - setLength:
      set:
        count: "${ (.items | length) }"
        isEmpty: "${ (.items | length) == 0 }"