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@sector-labs/redux-batched-subscribe

v0.1.7-sl

Published

redux store enhancer which allows batching subscribe notifications.

Downloads

6

Readme

redux-batched-subscribe

build status npm version

Store enhancer for redux which allows batching of subscribe notifications that occur as a result of dispatches.

npm install --save redux-batched-subscribe

Usage

The batchedSubscribe store enhancer accepts a function which is called after every dispatch with a notify callback as a single argument. Calling the notify callback will trigger all the subscription handlers, this gives you the ability to use various techniques to delay subscription notifications such as: debouncing, React batched updates or requestAnimationFrame.

Since batchedSubscribe overloads the dispatch and subscribe handlers on the original redux store it is important that it gets applied before any other store enhancers or middleware that depend on these functions; The compose utility in redux can be used to handle this:

import { createStore, applyMiddleware, compose } from 'redux';
import { batchedSubscribe } from 'redux-batched-subscribe';

const enhancer = compose(
  applyMiddleware(...middleware),
  batchedSubscribe((notify) => {
    notify();
  })
)

// Note: passing enhancer as the last argument to createStore requires redux@>=3.1.0
const store = createStore(reducer, initialState, enhancer);

Note: since compose applies functions from right to left, batchedSubscribe should appear at the end of the chain.

The store enhancer also exposes a subscribeImmediate method which allows for unbatched subscribe notifications.

Examples

Debounced subscribe handlers:

import { createStore } from 'redux';
import { batchedSubscribe } from 'redux-batched-subscribe';
import debounce from 'lodash.debounce';

const debounceNotify = debounce(notify => notify());
// Note: passing batchedSubscribe as the last argument to createStore requires redux@>=3.1.0
const store = createStore(reducer, intialState, batchedSubscribe(debounceNotify));

React batched updates

import { createStore } from 'redux';
import { batchedSubscribe } from 'redux-batched-subscribe';

// React >= 0.14
import { unstable_batchedUpdates } from 'react-dom';

// Note: passing batchedSubscribe as the last argument to createStore requires redux@>=3.1.0
const store = createStore(reducer, intialState, batchedSubscribe(unstable_batchedUpdates));

Thanks

Thanks to Andrew Clark for the clean library structure.