Redux Saga is a Redux generator-based library that handles asynchronous events and impure functions. These are functions that do not always return the same result when assuming the same parameters, for example, when working with the application cache. It allows you to create the so-called Sagas - isolated code fragments that process the side effects of the application, which include deferred asynchronous events. Thanks to the Sagas, the code becomes clearer, and easier to manage and test. Generator-based code is similar to async/await syntax. Redux Thunk is a similar library, however, it is based on callbacks, which can cause a lot of code nesting.

Redux Saga Homepage