cachefn

Decorate async (Promise.returning) functions with an expiring cache so costly operations don't need to be run all the time.

API

cachedFunction(func, timeout = Infinity)

Returns a CachedFunction that will call func once until the cache expires. timeout is the timeout in milliseconds until the cache expires.

CachedFunction()

Returns a promise with the last value returned by the original function, unless the cache has expired, in which case it calls the function and returns a promise to the result.

CachedFunction#exec()

Run the original function, ignoring any cache. Calling it will store the result on the cache, overriding any previous result and timeout.

CachedFunction#clear()

Clear the cache. The next time the function is run, it will call the original function no matter what.