62 lines
1.6 KiB
JavaScript
62 lines
1.6 KiB
JavaScript
/* @flow */
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import { applyMiddleware } from 'redux';
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import type { Middleware } from 'redux';
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/**
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* A registry for Redux middleware, allowing features to register their
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* middleware without needing to create additional inter-feature dependencies.
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*/
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class MiddlewareRegistry {
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_elements: Array<Middleware<*, *>>;
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/**
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* Creates a MiddlewareRegistry instance.
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*/
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constructor() {
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/**
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* The set of registered middleware.
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*
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* @private
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* @type {Middleware[]}
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*/
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this._elements = [];
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}
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/**
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* Applies all registered middleware into a store enhancer.
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* (@link http://redux.js.org/docs/api/applyMiddleware.html).
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*
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* @param {Middleware[]} additional - Any additional middleware that need to
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* be included (such as middleware from third-party modules).
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* @returns {Middleware}
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*/
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applyMiddleware(...additional: Array<Middleware<*, *>>) {
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// XXX The explicit definition of the local variable middlewares is to
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// satisfy flow.
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const middlewares = [
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...this._elements,
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...additional
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];
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return applyMiddleware(...middlewares);
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}
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/**
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* Adds a middleware to the registry.
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*
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* The method is to be invoked only before {@link #applyMiddleware()}.
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*
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* @param {Middleware} middleware - A Redux middleware.
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* @returns {void}
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*/
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register(middleware: Middleware<*, *>) {
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this._elements.push(middleware);
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}
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}
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/**
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* The public singleton instance of the MiddlewareRegistry class.
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*/
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export default new MiddlewareRegistry();
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