Why Refract.npm install the package you want to use:refract-rxjs to send data to localstorage.username prop changes, its new value is sent into the stream. The stream debounces the input for two seconds, then maps it into an object (with a type of localstorage) under the key value. Each time an effect with the correct type is emitted from this pipeline, the handler calls localstorage.setItem with the effect's name and value properties.aperture and a handler - and shows how they can be integrated into a React component via the withEffects higher-order component.aperture controls the streams of data entering Refract. It is a function which observes data sources within your app, passes this data through any necessary logic flows, and outputs a stream of effect values in response.handler is a function which causes side-effects in response to effect values.