/**
 * Shared base for the file-system resource backends. The native id is read once from the native
 * metadata at construction time (in each backend's `create()`), so the synchronous `id` getter —
 * required by `FileSystemStorageBackend.storageExists` and the cache lookups — does not have to await.
 */
export declare abstract class CachedIdClient {
    /** The storage id assigned by the native client. Set once by the subclass `create()`. */
    protected _cachedId: string;
    /** The storage id assigned by the native client. */
    get id(): string;
}
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