import type { H3Event } from 'h3';
export interface FetchLocalAssetOptions {
    fetchTimeout: number;
    headers?: Record<string, string>;
    /**
     * Also attempt an external HTTP fetch to `getNitroOrigin(event) + path` when
     * ASSETS and Nitro localFetch both miss. Enable for platforms where static
     * files are served by edge routing that never reaches the Nitro handler
     * (Vercel, Netlify). Disable for CF Workers where no ASSETS means no assets.
     */
    includeExternalFallback?: boolean;
    onStepFailure?: (url: string, err: unknown) => void;
}
/**
 * Resolve a same-origin asset path to bytes, trying (in order):
 *   1. Cloudflare Workers ASSETS binding
 *   2. Nitro localFetch (`event.$fetch`) — resolves dynamic routes too
 *   3. External `$fetch` to the Nitro origin (opt-in)
 *
 * All steps share a single `AbortSignal.timeout(fetchTimeout)` so a broken
 * URL can't burn N× the configured budget.
 *
 * Returns `undefined` when every step fails or times out.
 */
export declare function fetchLocalAsset(event: H3Event, path: string, options: FetchLocalAssetOptions): Promise<ArrayBuffer | undefined>;