import { FlagValue, FlagEvaluation } from './types';
/**
 * Check if a single feature flag is enabled.
 *
 * @param flagKey - The feature flag key to check
 * @param defaultValue - Default value if flag not found (default: true — default-allow)
 * @returns Whether the flag is enabled
 */
export declare function useFeatureFlag(flagKey: string, defaultValue?: boolean): boolean;
/**
 * Get the resolved value of a single feature flag.
 *
 * @param flagKey - The feature flag key
 * @param defaultValue - Default value if flag not found
 * @returns The resolved flag value
 *
 * @example
 * ```tsx
 * const maxItems = useFeatureFlagValue('max-items-per-page', 20);
 * const theme = useFeatureFlagValue('experiment-theme', 'default');
 * ```
 */
export declare function useFeatureFlagValue<T extends FlagValue = FlagValue>(flagKey: string, defaultValue: T): T;
/**
 * Get full evaluation details for a single feature flag.
 *
 * Useful when you need the resolution reason, variant, or error code.
 *
 * @param flagKey - The feature flag key
 * @returns The evaluation details, or undefined if not found
 *
 * @example
 * ```tsx
 * const evaluation = useFeatureFlagDetails('ab-test-checkout');
 * if (evaluation?.variant === 'variant-b') {
 *   return <CheckoutVariantB />;
 * }
 * ```
 */
export declare function useFeatureFlagDetails(flagKey: string): FlagEvaluation | undefined;
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