/**
 * App-owned feature-flag definitions. Core intentionally starts with an empty
 * registry: a flag key is part of an app's stable contract, not framework
 * configuration that Core should guess at.
 */
export interface FeatureFlagDefinition {
    key: string;
    /** Boolean flags are always default-off; explicit in operator metadata. */
    defaultValue?: false;
    displayName?: string;
    description?: string;
}
/** Define one app-local feature flag for registration at server startup. */
export declare function defineFeatureFlag(definition: FeatureFlagDefinition): FeatureFlagDefinition;
/** Define a small app-owned feature-flag registry. */
export declare function defineFeatureFlags(definitions: readonly FeatureFlagDefinition[]): readonly FeatureFlagDefinition[];
/** Register definitions once at Nitro startup. Re-registering identical data is safe for HMR. */
export declare function registerFeatureFlags(definitions: readonly FeatureFlagDefinition[]): void;
export declare function listFeatureFlags(): readonly FeatureFlagDefinition[];
export declare function getFeatureFlagDefinition(key: string): FeatureFlagDefinition | null;
/** Test-only registry reset; not exported from package entrypoints. */
export declare function _resetFeatureFlagRegistryForTests(): void;
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