react-feature-flags

A feature toggle (also feature switch, feature flag, feature flipper, conditional feature, etc.) is a technique in software development that attempts to provide an alternative to maintaining multiple source-code branches (known as feature branches), such that a feature can be tested even before it is completed and ready for release. Feature toggle is used to hide, enable or disable the feature during run time. For example, during the development process, a developer can enable the feature for testing and disable it for other users. https://en.wikipedia.org/wiki/Feature_toggle

Install

npm install --save react-feature-flags

Usage

Load your flags

Get your flags from anywhere: fetch, localStorage, a json file, Redux... The shape must be an array of object containing the following keys: name and isActive

const flags = [
  { name: 'vipOnly', isActive: false },
  { name: 'adminOnly', isActive: true }
];

FlagsProvider

Wrap your root component with FlagsProvider and pass your flags to it with the value props. That's how they will be available to all Flags component thanks to React context.

import { FlagsProvider } from 'react-feature-flags';
 
ReactDOM.render(
  <FlagsProvider value={flags}>
    <App />
  </FlagsProvider>,
  document.getElementById('root')
);

Flags

Flags components are aware of all flags given to FlagsProvider.

To render a node or a component based on your flags, you must pass by props an array of authorized flags to Flags component.

Then you can wrapped the desired component as children to a Flag component or use a renderOn props. It will be rendered if one or many flags are active (isActive) and match the flags included in authorizedFlags.

If the flags are not active neither matched with authorizedFlags nothing will be rendered unless you pass a component as fallback by the renderOff props.

with children props

import { Flags } from 'react-feature-flags';
 
<Flags authorizedFlags={['adminOnly']}>
  <h1>For admin</h1>
</Flags>

with renderOn props

import { Flags } from 'react-feature-flags';
 
<Flags authorizedFlags={['adminOnly']}
  renderOn={(authorizedFlags) => <h1>For admin</h1>}
/>

with renderOn props and renderOff props as fallback

import { Flags } from 'react-feature-flags';
 
<Flags authorizedFlags={['adminOnly']}
  renderOn={() => <h1>For admin</h1>}
  renderOff={() => <h1>For customers</h1>}
/>

when all flags are required

You can use the exactFlags props when you require all flag specified by authorizedFlags to be active before rendering something.

import { Flags } from 'react-feature-flags';
 
<Flags 
  exactFlags
  authorizedFlags={['flag', 'flagB']}
  renderOn={() => <h1>visible when flagA AND flagB are active</h1>}
/>

optionaly you can pass active flags down to children components

import { Flags } from 'react-feature-flags';
 
<Flags 
  exactFlags
  authorizedFlags={['flag', 'flagB']}
  renderOn={(activeFlags) => <SomeComponent />}
/>

SomeComponent will access to active flags (flags from context that match with authorizedFlags props)

License

MIT