import { createMachine } from 'xstate';

const machine = createMachine({
  initial: 'idle',
  states: {
    idle: {
      on: { SEARCH: 'searching' }
    },
    searching: {
      on: {
        RESOLVE: 'success',
        REJECT: 'failure',
      }
    },
    success: {
      on: { SEARCH: 'searching' }
    },
    failure: {
      on: { SEARCH: 'searching' }
    }
  }
});

import { createMachine } from 'xstate';

const machine = createMachine({
  // ...
});

const searchingState = machine
  .transition('idle', 'SEARCH');

searchingState.value;
// => 'searching'

import { createMachine, interpret } from 'xstate';

const machine = createMachine({
  // ...
});

const service = interpret(machine)
  .onTransition(state => console.log(state))
  .start();

service.send('SEARCH');
// State {
//   value: 'searching',
//   ...
// }