sub-redux/lib/middleware.js

[](https://www.npmjs.com/package/sub-redux) [](https://www.npmjs.com/package/sub-redux)

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var redux_1 = require("redux");
var actions_1 = require("./actions");
var actionHelpers_1 = require("./actionHelpers");
var subStore_1 = require("./subStore");
exports.middleware = function (store) {
    var chains = {};
    return function (next) { return function (action) {
        if (action.type === 'SUB_REDUX/INIT') {
            chains[action.payload.instance] = applySubMiddleware(store, action.payload.instance, action.meta.middlewares);
        }
        if (action.type === 'SUB_REDUX/DESTROY') {
            delete chains[action.payload.instance];
        }
        if (actions_1.isSubAction(action)) {
            // Insert the middleware chain for this sub-instance between this
            // middleware and next. HOWEVER, the sub-chain needs the unwrapped action,
            // then we need to rewrap it before passing it on to the next middleware
            var _a = actionHelpers_1.unwrapSubAction(action), instance_1 = _a.instance, subAction = _a.subAction;
            var nextWithRewrapped = function (subAction) {
                return next(actionHelpers_1.wrapSubAction({ instance: instance_1, subAction: subAction }));
            };
            return chains[instance_1](nextWithRewrapped)(subAction);
        }
        return next(action);
    }; };
};
// Inspired by redux's applyMiddleware.
function applySubMiddleware(store, instance, middlewares) {
    var subStore = subStore_1.getSubMiddlewareApi(instance, store);
    var dispatch = function () {
        throw new Error('Dispatching while constructing your middleware is not allowed. ' +
            'Other middleware would not be applied to this dispatch.');
    };
    var middlewareAPI = {
        getState: subStore.getState,
        dispatch: function () {
            var args = [];
            for (var _i = 0; _i < arguments.length; _i++) {
                args[_i] = arguments[_i];
            }
            return dispatch.apply(void 0, args);
        },
    };
    var chain = middlewares.map(function (m) { return m(middlewareAPI); });
    dispatch = function (subAction) { return subStore.dispatch(subAction); };
    return redux_1.compose.apply(void 0, chain);
}