import type { ITwinIdArg, PreferenceArg, PreferenceKeyArg, UserPreferencesAccess } from "@itwin/core-frontend";
/** Index signature holding preferences content
 *
 * @internal
 */
interface KeyContentProps {
    [preferenceKey: string]: any;
}
/**
 * @beta
 */
export interface PreferencesBrowserStorageOptions {
    /** indicate whether or not delete function should throw an error if the provided key cannot be found. */
    throwOnDeleteMissingKey?: boolean;
}
/** User preferences implementation using browser's local storage.
 * It creates storage item key in the form of:
 *     <storageItemKeyPrefix>.<itwin_guid?>.<imodel_guid?>
 *
 * <itwin_guid> and <imodel_guid> being optional.
 *
 * Each entry in the storage is a serialized JSON of the following index signature:
 * {
 *  "<preference_namespace?>.<preference_key>": {
 *    ...
 *    <preferences_json_content>
 *   },
 *   ...
 * }
 * @beta
 */
export declare class PreferencesBrowserStorage implements UserPreferencesAccess {
    private readonly _options;
    private readonly _storageItemKeyPrefix;
    constructor(storageItemKeyPrefix: string, opts?: PreferencesBrowserStorageOptions);
    private getStorageItemKey;
    private static getPreferenceKey;
    get(arg: PreferenceKeyArg & ITwinIdArg): Promise<KeyContentProps | KeyContentProps[] | undefined>;
    delete(arg: PreferenceKeyArg & ITwinIdArg): Promise<void>;
    save(arg: PreferenceArg & ITwinIdArg): Promise<void>;
}
export {};
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