react-feature-manager

React high-order components kit to make feature management simple

react-feature-manager is a library which provide high order components to manange your application features, run dark launches or A/B tests.

This library is back-end agnostick and will work with any feature-flag implemenemtation as long as you provide the client to it.

Installation

npm install --save react-feature-manager

or yarn add react-feature-manager

How to use

Dependencies

For bundle size optimisation purposes this library does not include following dependencies and expect them to be provided as peer dependencies:

• React
• React Dom
• PropTypes

Library API

This library provides 3 HOCs:

• Provider - provides client to Feature HOCs
• Feature - defines a feature to manage. Requires name: string property, which should be a featureFlag name
• Option - defines a feature implemenatation. Requires a value property. If value is equal to featureFlag value - childern of Option will be rendered.

At the top level of your app add client provider:

   import { Provider as FeatureClientProvider } from 'react-feature-manager';
   ...

   ReactDOM.render(
     <FeatureClientProvider client={yourClientImplementation}>
       <MyApplication />
     </FeatureClientProvider>,
     document.getElementById('application-container')
   );

NOTE: if your build system does not support "module builds" or you decided to use UMD version of this package for some reason, your imports have to look like:

  import featureManager from 'react-feature-manager'

  const { Provider } = featureManager;
  ...
  const { Feature, Option } = featureManager;

This example is just simple on/off switch:

import React from 'react';
import { Feature, Option } from 'react-feature-manager';

<Feature name="one">
  <Option value>
      <span>
        Feature <span className="bold">one</span> is enabled
      </span>
  </Option>
</Feature>

Or if you have multiple implementations and want to display specific implementation based on some db or config value (like when you run an A/B test):

import React from 'react';
import { Feature, Option } from 'react-feature-manager';

const SomeComponent = () => (
  <section className="column">
    <h3>My A/B test:</h3>
      <Feature name="myABTestFlagName">
        <Option value="RecipieA">
          <span>
            <span className="bold">RecipieA</span> enabled
          </span>
        </Option>
        <Option value="RecipieB">
          <span>
           <span className="bold">RecipieB</span> enabled
          </span>
        </Option>
        <Option value="RecipieC">
          <span>
            <span className="bold">RecipieC</span> enabled
          </span>
        </Option>
      </Feature>
  </section>
);

Client

The client is a simple JavaScript object which provides the following methods:

{
  subscribe: function(flagName, callback),
  getFeatureFlagValue: function(flagName)
}

• subscribe - takes a flagName: String and supposed to call a callback when flagName value is changed. Optionaly subscribe may return an unSubscribe function which will be called on Feature component unmount.
• getFeatureFlagValue - takes a flagName and returns either flag value or Promise which resolves with a flag value.

Since I can not know your specific implementation for a flag storage - the client is not provided with this library. However there is an example of a mock client in the example folder

How to run an example

1. git clone https://github.com/AndrewKovalenko/react-feature-manager.git
2. cd react-feature-manager
3. npm install
4. npm start Browser should open automatically, but if it doesn't - visit http://localhost:10001/ once build is finished.