@featurevisor/react/lib/useFlag.js

React package for Featurevisor

import { useEffect, useState } from "react";
import { useSdk } from "./useSdk";
import { onFeatureChange } from "./onFeatureChange";
export function useFlag(featureKey, context = {}) {
    const sdk = useSdk();
    const initialValue = sdk.isEnabled(featureKey, context);
    const [isEnabled, setIsEnabled] = useState(initialValue);
    useEffect(() => {
        const unsubscribe = onFeatureChange(sdk, featureKey, () => {
            const newValue = sdk.isEnabled(featureKey, context);
            if (newValue !== isEnabled) {
                setIsEnabled(newValue);
            }
        });
        return () => {
            unsubscribe();
        };
    }, [featureKey, context]);
    return isEnabled;
}
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