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machine.js

const machine = Machine({
  id: 'workflow',
  initial: 'idle',
  parallel: true,
  states: {
      jira: {
        id: "jira",
        initial: "todo",
        states: {
          todo: {
            on: { '': 'ready_for_development' },
          },
          ready_for_development: {
            on: { ASSIGN: "in_progress" },
          },
          in_progress: {
            on: { CREATE_PR: 'pr_review' },
          },
          pr_review: { on: { APPROVE_PR: 'pr_reviewed'}},
          pr_reviewed: { on: {MERGE_TO_DEVELOPMENT: 'ready_for_testing' }},
          ready_for_testing: { on: { TESTING: 'qa'}},
          qa: { on: { TEST_PASS: 'ready_to_merge' }},
          ready_to_merge: { on: { release: 'done'}},
          done: {}
        },
      },
      github: {
        id: "github",
        initial: "idle",
        states: {
          idle: { on: {ASSIGN: 'coding'}},
          coding: { on: { CREATE_PR: 'waiting_for_review' }},
          waiting_for_review: { on: {APPROVE_PR: 'waiting_to_merge'}}, 
          waiting_to_merge: { on: {MERGE_TO_DEVELOPMENT: 'development'}},
          development: {on: {MERGE_TO_STAGING: 'staging' }},
          staging: { on :{MERGE_TO_MASTER: 'master' }
          },
          master: { on: {'': 'idle'}}
        }
      },
      circleci: {
        id: 'circleci',
        initial: 'idle',
        states: {
          idle: { on: { 
            CREATE_PR: 'build',
          }},
          build: { on: { '': 'test' }},
          test: { on: { '': 'upload_browserstack' }},
          upload_browserstack: { on: {'' : 'done' }},
          done: { on: {'': 'idle' }},
        },
      },
      appcenter: {
        id: 'appcenter',
        initial: 'idle',
        states: {
          idle: { on: { MERGE_TO_STAGING: 'build',
          MERGE_TO_MASTER: 'build',
          } },
          build: { on: { '': 'idle'} },
        }
      },
      google_play: {
        id: "google_play",
        initial: "idle",
        states: {
          idle: { on: {MERGE_TO_STAGING: 'alpha'}},
          alpha: { on: {MERGE_TO_MASTER: 'beta'}},
          beta: { on: { RELEASE: 'production'}},
          production: { on: {'': 'idle'}},
        }
      }
  }
});