const flusher = new Flusher();
const multiplicand = new Signal(1);
const multiplier = new Signal(2);
const product = new LazyComputed(() => multiplicand.value * multiplier.value, flusher);

console.log(product.value); // 2
await Promise.resolve(); // Dependency tracking is asynchronous read more in `dependency_tracking.ts`

multiplicand.value  = 3;
console.log(product.value); // 2

flusher.flush(); // update happens only after flusher has been flushed!

console.log(product.value); // 6