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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const createAPIMachine = (name) => Machine({
    id: name,
    initial: 'idle',
    context: {
      retries: 0
    },
    states: {
      idle: {
        on: {
          FETCH: 'pending.load',
          UPDATE: 'pending.update',
          CREATE: 'pending.create',
        }
      },
      pending: {
        states: {
          previous: {
            type: 'history',
            target: 'load'
          },
          load: {
            on: {
              RESOLVE: `#${name}.success`,
              REJECT: `#${name}.failure`
            }
          },
          update: {
            on: {
              RESOLVE: `#${name}.success`,
              REJECT: `#${name}.failure`
            }
          },
          create: {
            on: {
              RESOLVE: `#${name}.success`,
              REJECT: `#${name}.failure`
            }
          },
        }
      },
      success: {
        on: {
          FETCH: 'pending.load',
          UPDATE: 'pending.update',
          CREATE: 'pending.create',
        }
      },
      failure: {
        on: {
          RETRY: {
            target: 'pending.previous',
            actions: assign({
              retries: (context, event) => context.retries + 1
            })
          }
        }
      }
    }
  });
  
  const countryListMachine = createAPIMachine('CountryList')