DefinitelyTyped/types/javascript-state-machine/javascript-state-machine-tests.ts

import { StateMachine, StateMachineEvent, create } from 'javascript-state-machine';

interface StateMachineTest extends StateMachine {
	warn?: StateMachineEvent;
	panic?: StateMachineEvent;
	calm?: StateMachineEvent;
	clear?: StateMachineEvent;
}

const fsm: StateMachineTest = StateMachine.create({
	initial: 'green',
	events: [
		{ name: 'warn', from: 'green', to: 'yellow' },
		{ name: 'panic', from: 'yellow', to: 'red' },
		{ name: 'calm', from: 'red', to: 'yellow' },
		{ name: 'clear', from: 'yellow', to: 'green' }
	],
	callbacks: {
		onpanic(event?, from?, to?, msg?) { alert('panic! ' + msg); },
		onclear(event?, from?, to?, msg?) { alert('thanks to ' + msg); },
		ongreen(event?, from?, to?) { document.body.className = 'green'; },
		onyellow(event?, from?, to?) { document.body.className = 'yellow'; },
		onred(event?, from?, to?) { document.body.className = 'red'; },
	}
});

// fsm.warn();					// transition from green to yellow
// fsm.panic("ERROR ALERT");	// transition from yellow to red
// fsm.calm();					// transition from red to yellow
// fsm.clear("All clear");		// transition from yellow to green

const transitions = fsm.transitions();