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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const fetchMachine = Machine({
    id: 'fetch',
    initial: 'no_data',
    states: {
      no_data: {
        // this is fresh app launch
        // and initial launch after
        // install, because we don't
        // persist data, we only cache
        // it in session / in memory
        on: {
          FETCH: 'loading'
        }
      },
      loading: {
        on: {
          SUCCESS: 'success',
          DEFAULT: 'check_internet',
        }
      },
      success: {
        on: {
          // this is checking local data
          NO_USER_OR_UPI_PROFILE: 'display_link_account',
          NO_DEFAULT_ACCOUNT: 'display_activate_upi',
          ALL_DATA: 'display_qr',
        }
      },
      display_link_account: {
        // this is calling profile
        // mehtods from MT
        on: {
          REFRESH_SUCCESS: 'success',
          REFRESH_DEFAULT: 'got_default_data'
          // REFRESH_FAILURE_AND_INTERNET: 'show_qr_generic_error',
          // REFRESH_FAILURE_AND_NO_INTERNET: 'check_internet',
        },
         type: 'final'
      },
      display_activate_upi: {
        // this is calling profile
        // mehtods from MT
        on: {
          REFRESH_SUCCESS: 'success',
          REFRESH_DEFAULT: 'got_default_data'
          // REFRESH_FAILURE_AND_INTERNET: 'show_qr_generic_error',
          // REFRESH_FAILURE_AND_NO_INTERNET: 'check_internet'
        },
         type: 'final'
      },
      display_qr: {
        // refresh method here
        // means fetchQR method
        // from MT
        on: {
          REFRESH_SUCCESS_AND_INTERNET: 'success',
          REFRESH_SUCCESS_AND_NO_INTERNET:
            'display_qr',
          REFRESH_FAILURE: 'got_default_data'
        },
        type: 'final'
      },
      got_default_data: {
        on: {
          NO_INTERNET: 'check_internet',
          INTERNET: 'show_qr_generic_error',
        },
        type: 'final'
      },
      check_internet : {
        on: {
          REFRESH: 'loading'
        },
        type: 'final'
      },
      show_qr_generic_error : {
        on: {
          REFRESH: 'loading'
        },
        type: 'final'
      }
    }
  });