import type { StorageChange, StorageChangeEvent } from '../@types/storage';
declare const TRACKED_AREAS: readonly ["local", "sync", "managed"];
export type Area = (typeof TRACKED_AREAS)[number];
/** Extension storage holds arbitrary JSON; this library writes only strings, so anything else reads as absent. */
export declare function toStoredValue(value: unknown): string | null | undefined;
export declare function toStorageChanges(changes: {
    [key: string]: {
        oldValue?: unknown;
        newValue?: unknown;
    };
}): {
    [key: string]: StorageChange;
};
export declare function toStoredItems(items: {
    [key: string]: unknown;
}): {
    [key: string]: string;
};
export interface ListenerRegistry {
    fire(changes: {
        [key: string]: StorageChange;
    }, area: string): void;
    createOnChanged(area: Area): StorageChangeEvent;
}
/** Demultiplexes an extension's single `onChanged` event to one notifier per area, one registry per adapter. */
export declare function createListenerRegistry(): ListenerRegistry;
export {};
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