import type { AssetsClient } from "../assets.js";
export interface UseAithosAssetState {
    /** A `blob:` URL pointing at the decrypted plaintext. Use in <img src=…> etc. */
    readonly url: string | null;
    /** Raw decrypted bytes. Use when you need the binary itself (e.g. PDF viewer). */
    readonly bytes: Uint8Array | null;
    /** IANA media type — useful for routing rendering. */
    readonly mediaType: string | null;
    /** Plaintext size in bytes. */
    readonly sizeBytes: number | null;
    /** True while the fetch+decrypt is in flight. */
    readonly loading: boolean;
    /** Non-null when the fetch/decrypt failed. */
    readonly error: Error | null;
}
export interface UseAithosAssetOptions {
    /** Override the client from context. Useful for tests. */
    readonly client?: AssetsClient | null;
    /**
     * If `true`, the hook keeps the previous blob URL visible while a
     * new URN is being fetched, instead of flashing `null`. Default
     * `false` (more predictable, less visual stutter avoidance).
     */
    readonly keepPreviousOnUrnChange?: boolean;
}
/**
 * Fetch + decrypt an Aithos asset and return a stable `blob:` URL.
 *
 * Lifecycle:
 *  - On mount or when `urn` changes, runs `client.fetch(urn)`.
 *  - On success, creates an object URL from the plaintext bytes.
 *  - On unmount or before refetching, revokes the URL to free memory.
 *  - Cancels in-flight fetches if the URN changes mid-flight.
 *
 * Throws (via `error`) when no client is available — supply one via
 * `<AssetsClientProvider>` or the `client` option.
 */
export declare function useAithosAsset(urn: string | null | undefined, options?: UseAithosAssetOptions): UseAithosAssetState;
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