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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const fetchMachine = Machine(
    {
    id: 'load-and-dedupe-draft-rx-for-entry',
    context: {},
    initial: 'load_draft_details',
    states: {
      load_draft_details: {
        invoke: {
          src: 'getDraftRxDetails'
        },
        on: {
          DRAFT_LOADED: {
            target: 'check_rx_draft_is_escribe',
            actions: assign({
              draftRx: (_ctx, event) => event.draftRx
            })
          },
          ERROR: {
            target: 'error'
          }
        }
      },
      check_rx_draft_is_escribe: {
        invoke: {
          src: 'isRxDraftEscribe'
        },
        on: {
          IS_ESCRIBE: {
            target: 'load_message_details'
          },
          IS_NOT_ESCRIBE: {
            target: 'should_enter'
          }
        }
      },
      load_message_details: {
        invoke: {
          src: 'getEscribeMessageDetail'
        },
        on: {
          ESCRIBE_DETAILS_LOADED: {
            target: 'check_for_duplicate_entry'
          },
          ERROR: {
            target: 'error'
          }
        }
      },
      check_for_duplicate_entry: {
        invoke: {
          src: 'checkForDuplicate'
        },
        on: {
          IS_DUPLICATE: {
            target: 'mark_as_duplicate'
          },
          IS_NOT_DUPLICATE: {
            target: 'should_enter'
          }
        }
      },
      mark_as_duplicate: {
        invoke: {
          src: 'markDuplicate'
        },
        on: {
          MARKED_DUPLICATE: {
            target: 'is_duplicate_escribe'
          },
          ERROR: {
            target: 'error'
          }
        }
      },
      is_duplicate_escribe: {
        type: 'final',
        data: {
          skipped: true,
          error: null
        }
      },
      should_enter: {
        type: 'final',
        data: {
          skipped: false,
          error: null
        }
      },
      error: {
        type: 'final',
        data: {
          skipped: false,
          error: (_ctx, event) =>
            event.type === 'ERROR' 
              ? event.error 
              : Error('Bad Error event')
        }
      }
    }
  });