redux-vertical/lib/combine-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"));
const isPlainObject_1 = __importDefault(require("./utils/isPlainObject"));
function combineReducers(handlers) {
    invariant_1.default(isPlainObject_1.default(handlers), 'combineReducers expected a dictionary object of reducers but found %s', handlers);
    // check the reducers
    Object.keys(handlers).forEach((ns) => {
        const reducer = handlers[ns];
        invariant_1.default(typeof reducer === 'function', 'reducer for %s should be functions but found %s', ns, reducer);
    });
    // create final reducer
    function finalReducer(state = {}, action) {
        let hasChanged = false;
        const nextState = {};
        Object.keys(handlers).forEach((ns) => {
            const reducer = handlers[ns];
            const previousStateForKey = state[ns];
            const nextStateForKey = reducer(previousStateForKey, action);
            invariant_1.default(!(typeof nextStateForKey === 'undefined'), 'expected defined state for ns %s', ns);
            nextState[ns] = nextStateForKey;
            hasChanged = hasChanged || nextStateForKey !== previousStateForKey;
        });
        return hasChanged ? nextState : state;
    }
    return finalReducer;
}
exports.default = combineReducers;
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