Module deferred 

Code a program fetches the first time it is used rather than before its first frame (the browser desktop’s lazily loaded modules).

The toolkit asks Deferred::get for the code where it needs it. Until the program installed it, that returns None and, once, calls the loader the program registered (Deferred::defer); the loader fetches the code and hands it over (Deferred::install) or reports that it could not (Deferred::load_failed), after which the next use fetches again. Code that can wait for it, such as a request already running asynchronously, awaits Deferred::wait instead.

Structs

Deferred

One piece of code a program fetches on first use; see the module documentation.