FlagSwitch React

FlagSwitch React is a feature flagging utility for React applications that dynamically loads and manages feature components based on versioning and traffic splits. Designed to simplify progressive rollouts and A/B testing, it allows you to experiment and iterate on features with minimal friction.

Installation

Install FlagSwitch React via npm:

npm install flagswitch-react

Getting Started

Basic Setup

Begin by importing and initializing the feature loader with any global settings you require. Then, define your feature flags along with their respective traffic splits.

Create your feature configuration:

// flag-switch.ts
import { flagSwitch } from "flagswitch-react";

export const loadFeatures = flagSwitch({
  features: {
    CheckoutFlow: {
      enabled: true,
      split: { MultiStepCheckout: 30, SingleStepCheckout: 70 },
    },
  },
});

Load and export your feature flag:

// index.ts
import { loadFeatures } from "./flag-switch";

// Load the CheckoutFlow feature configuration.
export const CheckoutFlow = loadFeatures('CheckoutFlow');

Important: Place your feature components in the /src/features directory next to your loadFeatures call and export each component as the default export.

Advanced Configuration

Global Options

Customize the loading behavior and feature definitions with global options. For example, you can define a custom naming pattern using a regular expression:

import { flagSwitch } from "flagswitch-react";

export const loadFeatures = flagSwitch({
  namePattern: /(?<name>[^\/]+)$/, // Regex to extract the feature name from a file path.
  features: {
    // Define global configurations for specific features.
    // [featureName]: { ... },
  },
});

Using Environment Variables

You can also load feature definitions from environment variables. This approach is particularly useful for CI/CD pipelines or other scenarios where configuration is managed outside of your source code:

import { flagSwitch } from "flagswitch-react";

export const loadFeatures = flagSwitch({
  features: import.meta.env.VITE_FEATURES,
});

Roadmap

The following features are planned for future releases:

• Webpack Support: Seamless integration with bundling processes.
• Multi-Organization & Environment Support: Configure flags across various environments and organizational setups.
• Enhanced Versioning: Support for multiple feature versions with metadata using the name_version_metadata pattern.

Additional Examples

For more advanced usage and configuration examples, please refer to the examples directory on GitHub.

Contributing

Contributions are highly encouraged! If you’d like to improve FlagSwitch React, please open an issue or submit a pull request on GitHub.

License

FlagSwitch React is MIT Licensed.