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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const SANITY_CHECKS = {
    id: 'sanityChecks',
    initial: 'CHECK_IF_HEARTBEAT',
    states: {
      CHECK_IF_HEARTBEAT: {
        on: {
          'NO_HOOK_ID': '#githubHook.RETURN_204', 
          'HOOK_ID_PRESENT': 'VERIFY_ACTION_TYPE',
        }
      },
      VERIFY_ACTION_TYPE: {
        on: {
          'ACTION_TYPE:OPEN': 'CHECK_PULL_ID',
          'ACTION_TYPE:SYNC': 'CHECK_PULL_ID', 
          'ALL_OTHER_ACTIONS': '#githubHook.RETURN_204',
        }
      },
      CHECK_PULL_ID: {
        on: {
          PRESENT: '#githubHook.RETURN_204',
          'NOT_PRESENT': '#githubHook.RETURN_400'
        }
      }
    }
  }
  
  
  
  const fetchMachine = Machine({
    id: 'githubHook',
    initial: 'IDLE',
    states: {
      IDLE: {
        type: 'final'
      },
      HOOK_TRIGGERED: {
        on: {
          'VERIFY_HOOK_DETAILS': 'SANITY_CHECKS',
        }
      },
      SANITY_CHECKS: {
        ...SANITY_CHECKS
      },
      'RETURN_204': {
        type: 'final'
      },
      'RETURN_400': {
        type: 'final'
      }
    },
    on: {
      GITHUB_PULL_REQUEST_RAISED: 'HOOK_TRIGGERED',
    }
  });