@prefab-cloud/prefab-cloud-react

prefab-cloud-react

A React provider and hook for Prefab

Installation

npm install @prefab-cloud/prefab-cloud-react or yarn add @prefab-cloud/prefab-cloud-react

TypeScript types are included with the package.

Usage in your app

Configure the Provider

Wrap your component tree in the PrefabProvider, e.g.

import { PrefabProvider } from "@prefab-cloud/prefab-cloud-react";

const WrappedApp = () => {
  const context = {
    user: { email: "[e-mail]" },
    subscription: { plan: "advanced" },
  };

  const onError = (error) => {
    console.error(error);
  };

  return (
    <PrefabProvider apiKey={"YOUR_API_KEY"} contextAttributes={context} onError={onError}>
      <App />
    </PrefabProvider>
  );
};

Here's an explanation of each provider prop:

property	required	type	purpose
apiKey	yes	string	your Prefab API key
onError	no	(error) => void	callback invoked if prefab fails to initialize
contextAttributes	no	ContextAttributes	this is the context attributes object you passed when setting up the provider
endpoints	no	string[]	CDN endpoints to load configuration from (defaults to 2 prefab-based CDNs)
timeout	no	number	initialization timeout (defaults to 10 seconds)
pollInterval	no	number	configures prefab to poll for updates every pollInterval ms.

Usage in Your Components

Use the usePrefab hook to fetch flags and config values:

const Logo = () => {
  const { isEnabled } = usePrefab();

  if (isEnabled("new-logo")) {
    return <img src={newLogo} className="App-logo" alt="logo" />;
  }

  return <img src={logo} className="App-logo" alt="logo" />;
};

usePrefab exposes the following:

const { isEnabled, get, loading, contextAttributes } = usePrefab();

Here's an explanation of each property:

property	example	purpose
isEnabled	isEnabled("new-logo")	returns a boolean (default false) if a feature is enabled based on the current context
get	get('retry-count')	returns the value of a flag or config
loading	if (loading) { ... }	a boolean indicating whether prefab content is being loaded
contextAttributes	N/A	this is the context attributes object you passed when setting up the provider
prefab	N/A	the underlying JavaScript prefab instance
keys	N/A	an array of all the flag and config names in the current configuration

Usage in your test suite

Wrap the component under test in a PrefabTestProvider and provide a config object to set up your test state.

e.g. if you wanted to test the following trivial component

function MyComponent() {
  const { get, isEnabled, loading } = usePrefab();
  const greeting = get("greeting") || "Greetings";

  if (loading) {
    return <div>Loading...</div>;
  }

  return (
    <div>
      <h1 role="alert">{greeting}</h1>
      {isEnabled("secretFeature") && (
        <button type="submit" title="secret-feature">
          Secret feature
        </button>
      )}
    </div>
  );
}

You could do the following in jest/rtl

import { PrefabTestProvider } from '@prefab-cloud/prefab-cloud-react';

const renderInTestProvider = (config: {[key: string]: any}) => {
  render(
    <PrefabTestProvider config={config}>
      <MyComponent />
    </PrefabTestProvider>,
  );
};

it('shows a custom greeting', async () => {
  renderInTestProvider({ greeting: 'Hello' });

  const alert = screen.queryByRole('alert');
  expect(alert).toHaveTextContent('Hello');
});

it('shows the secret feature when it is enabled', async () => {
  renderInTestProvider({ secretFeature: true });

  const secretFeature = screen.queryByTitle('secret-feature');
  expect(secretFeature).toBeInTheDocument();
});

Contributing

Contributions are what make the open source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated. For detailed contributing guidelines, please see CONTRIBUTING.md