import type { CompactFeature, CompactIndex, Domain } from './types';
/**
 * Register how the default index is produced. Called for its side effect by the
 * environment-specific entry (`./store-node` reads it from disk); browser
 * consumers can leave the empty default and call {@link setIndex} instead.
 */
export declare function setDefaultLoader(loader: () => CompactIndex): void;
export declare function getIndex(): CompactIndex;
/** Replace the active index (used by tests and consumers with custom data). */
export declare function setIndex(index: CompactIndex): void;
/** Restore the index to the registered default. */
export declare function resetIndex(): void;
/** Look up a single flattened feature by domain and dotted key. */
export declare function getFeature(domain: Domain, key: string): CompactFeature | null;
/** All keys indexed for a domain. */
export declare function listKeys(domain: Domain): string[];
/** Top-level API namespaces present in the index (e.g. `runtime`, `tabs`). */
export declare function apiNamespaces(): Set<string>;