refract-callbag

Harness the power of reactive programming
to supercharge your components

Why? · Install · The gist · Learn · Contribute · Discuss

• :bowling: Decentralised: attach effects and side-effects to your components, for better code splitting results
• :sunrise: Gradual: use on an existing component today, throughout your app tomorrow
• :rocket: Reactive: leverage the power and benefits of reactive programming
• :floppy_disk: Tiny: less than 2Kb minified and gzipped
• :pencil: Typed: written in TypeScript, fully typed integrations
• :zap: Universal: supports React, React Native, Inferno and Preact

Refract lets you handle your component effects and side-effects, so that you can write your code in a clear, pure, and declarative fashion by using reactive programming.

Refract makes reactive programming possible in React, React Native, Preact and Inferno, with only a single higher-order component! You can choose to start using a tiny bit of reactive programming, or go full reactive. Refract allows you to:

• Manage side effects like API calls, analytics, logging, etc.
• Manipulate, replace and inject props, you can even fully replace Redux connect HoC
• Handle state
• Render components

We also provide a Redux integration, which can serve as a template for integrations with other libraries. With a single HoC, you can fully replace libraries like recompose, redux-observable, and react-redux to name a few!

Why?

Component-based architecture and functional programming have become an increasingly popular approach for building UIs. They help make apps more predictable, more testable, and more maintainable.

However, our apps don't exist in a vacuum! They need to handle state, make network requests, handle data persistence, log analytics, deal with changing time, and so on. Any non-trivial app has to handle any number of these effects. Wouldn't it be nice to cleanly separate them from our apps?

Refract solves this problem for you, by harnessing the power of reactive programming. For an in-depth introduction, head to Why Refract.

Installation

npm install --save refract-callbag

Refract is available for a number of reactive programming libraries. For each library, a Refract integration is available for React, Inferno, Preact and Redux.

Available packages:

	React	Inferno	Preact	Redux
Callbag	refract-callbag	refract-inferno-callbag	refract-preact-callbag	refract-redux-callbag
Most	refract-most	refract-inferno-most	refract-preact-most	refract-redux-most
RxJS	refract-rxjs	refract-inferno-rxjs	refract-preact-rxjs	refract-redux-rxjs
xstream	refract-xstream	refract-inferno-xstream	refract-preact-xstream	refract-redux-xstream

The Gist

The example below uses refract-rxjs to send data to localstorage.

Every time the username prop changes, its new value is sent into the stream. The stream debounces the input for two seconds, then maps it into an object (with a type of localstorage) under the key value. Each time an effect with the correct type is emitted from this pipeline, the handler calls localstorage.setItem with the effect's name and value properties.

const aperture = component => {
    return component.observe('username').pipe(
        debounce(2000),
        map(username => ({
            type: 'localstorage',
            name: 'username',
            value: username
        }))
    )
}

const handler = initialProps => effect => {
    switch (effect.type) {
        case 'localstorage':
            localstorage.setItem(effect.name, effect.value)
            return
    }
}

const WrappedComponent = withEffects(aperture, { handler })(BaseComponent)

Aperture

An aperture controls the streams of data entering Refract. It is a function which observes data sources within your app, passes this data through any necessary logic flows, and outputs a stream of effects.

Signature: (component, initialProps) => { return effectStream }.

• The initialProps are all props passed into the WrappedComponent.
• The component is an object which lets you observe your React component.
• Within the body of the function, you observe the event source you choose, pipe the events through your stream library of choice, and return a single stream of effects.

Handler

A handler is a function which causes side-effects in response to any effect object output by the aperture.

Signature: (initialProps) => (effect) => { /* handle effects here */ }.

• The initialProps are all props passed into the WrappedComponent.
• The effect is each event emitted by your aperture.
• Within the body of the function, you call any side-effects imperatively.

withEffects

The withEffects higher-order component implements your side-effect logic as a React component.

Signature: (aperture, { handler }) => (Component) => { return WrappedComponent }

• The hoc takes in two arguments, followed by a component:
  • An aperture function
  • An optional config object accepting
    • a handler function
    • a errorHandler function
    • a Context object (React only)
• The hoc returns a WrappedComponent - an enhanced version of your original Component which includes your side-effect logic.

Learn Refract

Documentation

Documentation is available at refract.js.org. We aim to provide a helpful and thorough documentation: all documentation files are located on this repo and we welcome any pull request helping us achieve that goal.

Examples

We maintain and will grow over time a set of examples to illustrate the potential of Refract, as well as providing reactive programming examples: refract.js.org/examples.

Examples are illustrative and not the idiomatic way to use Refract. Each example is available for the four reactive libraries we support (RxJS, xstream, Most and Callbag), and we provide links to run the code live on codesandbox.io. All examples are hosted on this repo, and we welcome pull requests helping us maintaining them.

Contributing

We welcome many forms of contribution from anyone who wishes to get involved.

Before getting started, please read through our contributing guidelines and code of conduct.

Links

Logo

The Refract logo is available in the Logo directory.

License

Refract is available under the MIT license.

Discuss

Everyone is welcome to join our discussion channel - #refract on the Reactiflux Discord server.