feat OpenFeature Provider

OpenFeature web Provider for feat feature flags. Bridges the sync evaluation cache from @feathq/web-sdk to OpenFeature's client-side API.

Install

npm install @feathq/web-sdk @feathq/openfeature-web @openfeature/web-sdk

@feathq/web-sdk and @openfeature/web-sdk are peer dependencies.

Usage

import { OpenFeature } from "@openfeature/web-sdk";
import { FeatWebClient } from "@feathq/web-sdk";
import { FeatWebProvider } from "@feathq/openfeature-web";

const featClient = new FeatWebClient({
  apiKey: "feat_cs_…",
  url: "https://data-01.feat.so", // optional; this is the default
});

await OpenFeature.setProviderAndWait(new FeatWebProvider(featClient));
await OpenFeature.setContext({ targetingKey: "user-123" });

const client = OpenFeature.getClient();
const enabled = client.getBooleanValue("checkout-v2", false);   // sync

Notes

• All resolve*Evaluation methods are synchronous: the underlying client pre-evaluates every flag into a Map on setContext and on each datafile refresh.
• Type coercion: a flag declared as boolean returns the default with TYPE_MISMATCH if asked for a string, etc.
• OpenFeature.setContext(...) is the canonical way to change evaluation context; the provider's onContextChange propagates to the client.

License

MIT