export interface FeatureFlagDefinition {
    key: string;
    defaultValue?: false;
    displayName?: string;
    description?: string;
}
export declare function defineFeatureFlag(definition: FeatureFlagDefinition): FeatureFlagDefinition;
export declare const CONNECT_APPS_FLAG: FeatureFlagDefinition;
export declare const BUILDER_CREDIT_USAGE_REPORTING_FLAG: FeatureFlagDefinition;
/** @deprecated The redesigned Settings is always on; nothing reads this flag. Kept one release so apps generated from older templates still build. */
export declare const SETTINGS_REDESIGN_FLAG: FeatureFlagDefinition;
/**
 * Flags whose feature shipped to everyone. Apps generated from older templates
 * still read them to pick their layout, and an unregistered key reads false,
 * which would put them back on the removed path. `useFeatureFlag` and
 * `useFeatureFlagState` answer "on" for these; delete an entry when its
 * deprecated constant goes.
 */
export declare const RETIRED_ENABLED_FLAG_KEYS: ReadonlySet<string>;
export declare function defineFeatureFlags(definitions: readonly FeatureFlagDefinition[]): readonly FeatureFlagDefinition[];
export declare function registerFeatureFlags(definitions: readonly FeatureFlagDefinition[]): void;
export declare function listFeatureFlags(): readonly FeatureFlagDefinition[];
export declare function getFeatureFlagDefinition(key: string): FeatureFlagDefinition | null;
export declare function _resetFeatureFlagRegistryForTests(): void;