refx/refx.js

Redux middleware for triggering side effects

'use strict';

function flattenIntoMap( map, effects ) {
	var i;
	if ( Array.isArray( effects ) ) {
		for ( i = 0; i < effects.length; i++ ) {
			flattenIntoMap( map, effects[ i ] );
		}
	} else {
		for ( i in effects ) {
			map[ i ] = ( map[ i ] || [] ).concat( effects[ i ] );
		}
	}
}

function refx( effects ) {
	var map = {},
		middleware;

	flattenIntoMap( map, effects );

	middleware = function( store ) {
		return function( next ) {
			return function( action ) {
				var handlers = map[ action.type ],
					result = next( action ),
					i, handlerAction;

				if ( handlers ) {
					for ( i = 0; i < handlers.length; i++ ) {
						handlerAction = handlers[ i ]( action, store );
						if ( handlerAction ) {
							store.dispatch( handlerAction );
						}
					}
				}

				return result;
			};
		};
	};

	middleware.effects = map;

	return middleware;
}

module.exports = refx;