redux-vertical/lib/compose-reducers.js

Build redux vertically

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const invariant_1 = __importDefault(require("invariant"));
function composeReducers(...reducers) {
    reducers.forEach((reducer) => invariant_1.default(typeof reducer === 'function', 'reducer should be functions but found %s', reducer));
    function composedReducer(state, action) {
        let hasChanged = false;
        return reducers.reduce((iteratedState, reducer) => {
            const nextState = reducer(iteratedState, action);
            hasChanged = hasChanged || iteratedState !== nextState;
            return hasChanged ? nextState : iteratedState;
        }, state);
    }
    return composedReducer;
}
exports.default = composeReducers;
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