react-redux-toolbox

Redux

API Loaders

Saga Decorator

react-redux-toolbox exposes a decorator to wrap your saga between two action dispatched.

import { addLoader } from 'react-redux-toolbox';

export function* watchFetchMovies(): SagaType {
  yield takeLatest(actionTypes.FETCH_MOVIES, addLoader(fetchMovies, 'movies'));
}

In the example above,

{
  type: 'react-redux-toolbox/SHOW_LOADER',
  loaderName: 'movies',
}

will be dispatched before the action, and

{
  type: 'react-redux-toolbox/SHOW_LOADER',
  loaderName: 'movies',
}

just after.

Loader reducer

react-redux-toolbox also provides a reducer that you can add to your store, which will to the actions dipatched by the Saga Decorator to update your store:

import { combineReducers } from 'redux';
import { loaderReducer } from 'react-redux-toolbox';

const rootReducer = combineReducers({
  loader: loaderReducer,
  ...
});

A selector is also included:

export const isLoading = (state: any, loaderName: string, reducerName = 'loader'): boolean

Automatically change your components into Loaders

When using the saga decorator, with the loader reducer added to your store, wrap your components inside a LoaderWrapper and a loader will be displayed in their place when the loaderName is marked as loading.

import { LoaderWrapper } from 'react-redux-toolbox';

...

render() {
  return (
    <LoaderWrapper loaderName="movies">
      <Movies>
    </LoaderWrapper>
  )
}

Error handling

react-redux-toolbox exposes a decorator to automatically handle common API errors. For instance:

import { addLoader, catchApiExceptions as catchApiExceptionsUtil } from 'react-redux-toolbox';

const handleApiException = (error: any) => {
  if (__DEV__) console.warn(error);

  if (!error.response) {
    Toast.show('Connection error');
    return;
  }

  Toast.show('Something bad happened');
};

const catchApiExceptions = (saga, timeout) => catchApiExceptionsUtil(saga, timeout, handleApiException);

export function* watchFetchMovies(): SagaType {
  yield takeLatest(actionTypes.FETCH_MOVIES, addLoader(
    catchApiExceptions(fetchMovies),
    'movies'
  ));
}

Debug

Setup React Native debugger

Redirect network calls to the react native debugger:

import 'react-redux-toolbox/debug/setupReactNativeDebugger';

Testing

getNodeText

import React from 'react';
import { Text, View } from 'react-native';
import { shallow } from 'enzyme';
import { getNodeText } from 'react-redux-toolbox';

describe('getNodeText', () => {
  it('returns the sum of the two nodes text', () => {
    const component = shallow(<View>
      <Text>first text</Text>
      <Text>second text</Text>
    </View>);

    expect(getNodeText(component)).toEqual('first textsecond text');
  });
});