Incognitus Feature Flag

Usage

Install this as your projects's dependency

npm i @incognitus/client-react
# or
yarn add @incognitus/client-react

Installing the plugin

Before you're able to use the service you'll need to install the plugin with your tenant and application IDs.

App.tsx

import { useInitIncognitus } from '@incognitus/client-react';
function App() {
  useInitIncognitus({
    tenantId: 'f632ac6a71e57bc77a8cb7d04c8704e52b9a5538',
    applicationId: 'fecf1202.8edffdf0',
  });
}

Key	Description
tenantId	Your tenant id
applicationId	The id of the application and environment

Checking features

Component

You can use the included component to check feature flags. This is transparent and will not add an extra depth in the DOM. Using slots, you can configure different aspects like the loading state, or if the flag is enabled/disabled.

import FeatureFlag, {
  FeatureFlagLoading,
  FeatureFlagEnabled,
  FeatureFlagDisabled,
} from '@incognitus/client-react';

<FeatureFlag flag="feature name">
  <FeatureFlagLoading>
    <div>Loading</div>
  </FeatureFlagLoading>
  <FeatureFlagEnabled>
    <div>Enabled</div>
  </FeatureFlagEnabled>
  <FeatureFlagDisabled>
    <div>Disabled</div>
  </FeatureFlagDisabled>
</FeatureFlag>;

Props

Prop	Description
flag	The name of the feature flag
hidden	Hide content when the flag is enabled

Slots

Slot	Description
FeatureFlagLoading	Displayed when fetching the feature flag
FeatureFlagEnabled	Rendered when the flag is enabled
FeatureFlagDisabled	Rendered when the flag is disabled

React hook

If you would like to interact with the service directly, then it can be accessed through the useIncognitus hook. This returns isReady which returns true when the service is initiatlized and ready to be used, and service which returns the raw service

Service methods

Method	Description
service.isEnabled(featureName)	Checks if the flag is enabled
service.isDisabled(featureName)	Check if the flag is disabled
service.getFeature(featureName)	Fetches the feature from the server and returns it's status
service.getAllFeatures()	Fetches all features and stores them in the cache

Service

You can also use the service directly by importing IncognitusService.instance, however this is not recommended.

Caching

Currently all known feature flags are cached when the app initializes. New features that are not found in the cache are retrieved on-demand. The cache stays in place until the app is reloaded or by calling the getAllFeatures() method on the service.