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machine.js

const confidentialMachine = Machine({
    id: 'confidential',
    initial: 'OFF',
    context: {
      dndEnabled: false,
      retries: 0
    },
    on: {
        ENABLE_DND: 'LOADING',
        ACCESSORY_DISCONNECTED: 'DISABLED',
        RESOLVE_ENABLE_DND: 'DISABLED',
    },
    states: {
      OFF: {
        on: {
            TURN_ON: 'LOADING'
        },
        actions: assign({
            featureEnabled: () => false
          })
      },
      ON: {
        on: {
            TURN_OFF: 'LOADING'
        },     
        actions: assign({
            featureEnabled: () => true
          })
      },
      DISABLED: {
      },
      LOADING: {
        on: {
          RESOLVE_ON: 'ON',
          RESOLVE_OFF: 'OFF',
          RESOLVE_ENABLE_DND: {
            target: 'DISABLED',
            actions: assign({
              dndEnabled: () => true
            })
          },
          RESOLVE_DISABLE_DND: {
            actions: assign({
              dndEnabled: () => false
            })
          },
          ACCESSORY_COMMUNICATION_FAILURE: 'FAILURE'
        }
      },
      FAILURE: {
        on: {
          RETRY: {
            target: 'LOADING',
            actions: assign({
              retries: (context, event) => context.retries + 1
            })
          }
        }
      }
    }
  });