@jakesidsmith/redux-create-reducer/dist/index.js

A utility to create redux reducers from a set of handlers

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.createReducer = void 0;
var INVALID_HANDLER_KEYS = ['undefined', 'null'];
function validateKeys(handlers) {
    INVALID_HANDLER_KEYS.forEach(function (key) {
        if (Object.prototype.hasOwnProperty.call(handlers, key)) {
            throw new Error("Invalid createReducer handler key: " + key);
        }
    });
}
function createReducer(handlers, initialState) {
    if (!handlers ||
        typeof handlers !== 'object' ||
        Array.isArray(handlers)) {
        throw new Error('Invalid createReducer handlers - must be a string keyed object');
    }
    if (typeof initialState === 'undefined') {
        throw new Error('Invalid createReducer initialState value: undefined');
    }
    validateKeys(handlers);
    return function (state, action) {
        if (state === void 0) { state = initialState; }
        var type = action.type;
        if (Object.prototype.hasOwnProperty.call(handlers, type)) {
            return handlers[type](state, action);
        }
        return state;
    };
}
exports.createReducer = createReducer;
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