jiti-meet/react/features/base/redux/ReducerRegistry.js

67 lines
1.8 KiB
JavaScript

/* @flow */
import { combineReducers } from 'redux';
import type { Reducer } from 'redux';
/**
* The type of the dictionary/map which associates a reducer (function) with the
* name of he Redux state property managed by the reducer.
*/
declare type NameReducerMap<S, A> = { [name: string]: Reducer<S, A> };
/**
* A registry for Redux reducers, allowing features to register themselves
* without needing to create additional inter-feature dependencies.
*/
class ReducerRegistry {
_elements: NameReducerMap<*, *>;
/**
* Creates a ReducerRegistry instance.
*/
constructor() {
/**
* The set of registered reducers, keyed based on the field each reducer
* will manage.
*
* @private
* @type {NameReducerMap}
*/
this._elements = {};
}
/**
* Combines all registered reducers into a single reducing function.
*
* @param {Object} [additional={}] - Any additional reducers that need to be
* included (such as reducers from third-party modules).
* @returns {Function}
*/
combineReducers(additional: NameReducerMap<*, *> = {}) {
// $FlowExpectedError
return combineReducers({
...this._elements,
...additional
});
}
/**
* Adds a reducer to the registry.
*
* The method is to be invoked only before {@link #combineReducers()}.
*
* @param {string} name - The field in the state object that will be managed
* by the provided reducer.
* @param {Reducer} reducer - A Redux reducer.
* @returns {void}
*/
register(name: string, reducer: Reducer<*, *>) {
this._elements[name] = reducer;
}
}
/**
* The public singleton instance of the ReducerRegistry class.
*/
export default new ReducerRegistry();