redux-smart-actions/es/create-reducer.js

The fastest way to write Redux actions

var TYPES_DELIMITER = '@@';
export var joinTypes = function joinTypes() {
  for (var _len = arguments.length, types = new Array(_len), _key = 0; _key < _len; _key++) {
    types[_key] = arguments[_key];
  }

  return types.map(function (type) {
    return type.toString();
  }).join(TYPES_DELIMITER);
};
export var createReducer = function createReducer(handlers, defaultState) {
  handlers = Object.entries(handlers).reduce(function (prev, _ref) {
    var type = _ref[0],
        handler = _ref[1];

    if (type.includes(TYPES_DELIMITER)) {
      type.split(TYPES_DELIMITER).forEach(function (singleType) {
        prev[singleType] = handler;
      });
    } else {
      prev[type.toString()] = handler;
    }

    return prev;
  }, {});
  return function (state, action) {
    if (state === undefined) {
      return defaultState;
    }

    var handler = handlers[action.type];

    if (handler) {
      return handler(state, action);
    }

    return state;
  };
};