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Redux without the sanity checks in a single file. Don't use this, use normal Redux. :-)
function mapValues(obj, fn) {
return Object.keys(obj).reduce((result, key) => {
result[key] = fn(obj[key], key);
return result;
}, {});
}
function pick(obj, fn) {
return Object.keys(obj).reduce((result, key) => {
if (fn(obj[key])) {
result[key] = obj[key];
}
return result;
}, {});
}
function bindActionCreator(actionCreator, dispatch) {
return (...args) => dispatch(actionCreator(...args));
}
export function bindActionCreators(actionCreators, dispatch) {
return typeof actionCreators === 'function' ?
bindActionCreator(actionCreators, dispatch) :
mapValues(actionCreators, actionCreator =>
bindActionCreator(actionCreator, dispatch)
);
}
export function compose(...funcs) {
return arg => funcs.reduceRight((composed, f) => f(composed), arg);
}
export function applyMiddleware(...middlewares) {
return (next) => (reducer, initialState) => {
var store = next(reducer, initialState);
var dispatch = store.dispatch;
var chain = [];
chain = middlewares.map(middleware => middleware({
getState: store.getState,
dispatch: (action) => dispatch(action)
}));
dispatch = compose(...chain)(store.dispatch);
return { ...store, dispatch };
};
}
export function combineReducers(reducers) {
var finalReducers = pick(reducers, (val) => typeof val === 'function');
return (state = {}, action) => mapValues(finalReducers,
(reducer, key) => reducer(state[key], action)
);
}
export function createStore(reducer, initialState) {
var currentReducer = reducer;
var currentState = initialState;
var listeners = [];
var isDispatching = false;
function getState() {
return currentState;
}
function subscribe(listener) {
listeners.push(listener);
return function unsubscribe() {
var index = listeners.indexOf(listener);
listeners.splice(index, 1);
};
}
function dispatch(action) {
if (isDispatching) {
throw new Error('Reducers may not dispatch actions.');
}
try {
isDispatching = true;
currentState = currentReducer(currentState, action);
} finally {
isDispatching = false;
}
listeners.slice().forEach(listener => listener());
return action;
}
function replaceReducer(nextReducer) {
currentReducer = nextReducer;
dispatch({ type: '@@redux/INIT' });
}
dispatch({ type: '@@redux/INIT' });
return { dispatch, subscribe, getState, replaceReducer };
}
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