ko.computedContext can include some public functions such as
getDependencyCount - return number of dependencies so far in current evaluation. see knockout/knockout#627
isDependency - return whether an observable is a dependency in current evaluation
isInitial - is this the first evaluation of the computed?
didChange - if the given observable was previously a dependency, return whether this evaluation was due to a change in that observable (only really useful when the computed is used as a reactor) see #22
ko.computedContext can include some public functions such as