For testing (or debugging) purposes, it can be handy to get an XState machine running from a specific state.
Let's say a machine has an initial state of green and the other states it can
be in are yellow and red. And yellow has sub-states of walk and
hurry.
By default, a machine will start in the specified initial state.
const service = interpret(trafficLightMachine);
service.start();
service.state.value; //=> 'green'We can tell the traffic light service to start in the red state instead.
service.start('red');
service.state.value; //=> 'red'We can even tell it to start in a sub-state (nested state) of a particular state.
service.start({ yellow: 'hurry' });
service.state.value; //=> { yellow: 'hurry' }