better redux thunk

redux-better-thunk.js

function getNewState(getState, isOriginal) {
  const state = getState();
  return isOriginal ? state : object.assign({}, state);
}
function createThunkMiddleware(extraArgument, errorHandler) {
  return ({ dispatch, getState }) => next => action => {
    if (typeof action === 'function') {
      const result = action(dispatch, (isOriginal) => getNewState(getState, isOriginal), extraArgument);
      if (errorHandler && result.catch) result.catch(errorHandler);
      return result;
    }

    return next(action);
  };
}

const thunk = createThunkMiddleware();
thunk.withExtraArgument = createThunkMiddleware;

export default thunk;