import { Machine } from "ts-async-state-machine";

// Create your Machine
const MicrowaveMachine = new Machine('Microwave');

// Add States to the Machine
MicrowaveMachine.addState('off', ['running'], {
   onBeforeEnter: (prevState) => new Promise((resolve, rejection) => {
       // use a server APi request to 'confirm' the state change
       resolve();// resolves the state transition - changes 'MicrowaveMachine's state to 'off'
       // a 'rejection' will fail the internal state transition
   })
});
MicrowaveMachine.addState('on', ['off'], {
   // callbacks are optional and use them as needed: 'onEnter', 'onExit', 'onBeforeEnter' as options
   onExit: () => {
       console.log('Exited ON state')
   }
});
MicrowaveMachine.addState('running', ['on'], {
   onEnter: () => {
       console.log('Entered RUNNING State')
   }
});

// Initialise into your required starting state
MicrowaveMachine.start('off');

// Start Triggering State changes when neccessary
MicrowaveMachine.transition('on').then(newState => {
   console.log('Entered State', newState.name)
}); // omitted 'catch' for brevity

MicrowaveMachine.transition('running').then(newState => {
   console.log('Entered State', newState.name)
});