openfeature-posthog-provider

OpenFeature provider that delegates feature flag evaluation to PostHog. Use PostHog feature flags through the OpenFeature standard API.

Installation

npm install @leancodepl/openfeature-posthog-provider

API

OpenFeaturePosthogProvider(client)

Delegates feature flag evaluation to PostHog (posthog-js). Use this to access PostHog feature flags through the OpenFeature standard API. Flags return default values until PostHog has loaded and feature flags are available.

Parameters:

• client - PostHog - Initialized PostHog client instance

Usage Examples

Basic setup with OpenFeature

import posthog from 'posthog-js';
import { OpenFeature } from '@openfeature/web-sdk';
import { OpenFeaturePosthogProvider } from '@leancodepl/openfeature-posthog-provider';

posthog.init('YOUR_API_KEY');
OpenFeature.setProvider(new OpenFeaturePosthogProvider(posthog));
const client = OpenFeature.getClient();
const isEnabled = await client.getBooleanValue('my-feature', false);

Evaluating different flag types

import { OpenFeature } from '@openfeature/web-sdk';

const client = OpenFeature.getClient();
const stringValue = await client.getStringValue('welcome-message', 'Hello');
const numberValue = await client.getNumberValue('max-items', 10);
const jsonValue = await client.getObjectValue('config', { theme: 'light' });