In Valtio, updates to proxied objects are tracked internally with a version number.
Every mutation to a proxy increases a global version number, and assigns the just mutated proxy, and any parent proxies (which automatically subscribe to their child proxies), to the latest version number.
This is how
snapshot knows whether a new snapshot is necessary: has my proxy's version number changed since the last snapshot?
Given its importance to valtio's internal behavior, the
getVersion helper can be used to check if a proxied object has been updated, but this is not typically useful or recommended to use in application code because
useSnapshot already handle version tracking internally.