cancellable-example.mjs

function* testHelper() {
	console.log('Entering Helper');
	yield delay(1000); // State H-1
	console.log('Helper: Transition 1');
	yield delay(1000); // State H-2
	console.log('Helper: Transition 2');
	return 5;
}
function* test() {
	try {
		console.log('About to call testHelper');
		const value = yield* testHelper(); // State T-1
		console.log(`Got ${value} from testHelper`);
	} finally {
		console.log('starting the finally');
		yield delay(1000); // State T-2
		console.log('finishing the finally');
	}
	return 'success';
}
const a = cancelable(test());
a.then(result => console.log('cancelable resolved with', result));
// a.cancel() to cancel the machine at any time