Sometimes you might want to watch if store values used by some function changed, but you don't want it to re-run automatically.
manualWatch function allows exactly that. First argument is normal reaction callback, and 2nd one is callback that will be called each time some of store values used by the reaction changes
manualWatch reaction will not start until we call it for the first time with
Stop manual reaction
If you want to stop receiving notifications about manual reaction used data updates, call
Manual reaction can accept any count of arguments:
Calling manual reaction after it's stop function was called will throw an error.