/**
 * `fetch`-backed resource loader for CDN / HTTP-hosted `.bson` tables.
 *
 * Use this when resources are deployed alongside the function (e.g. via
 * `assets` in Vercel, or a public R2 / S3 bucket fronted by a CDN). The
 * loader has no platform deps — `fetch` is global on all modern runtimes.
 */
import type { ResourceLoader } from '../../types';
export interface FetchResourceLoaderOptions {
    /**
     * Base URL where the `resources/` tree is hosted. Must include the trailing
     * `/` because relative paths (`geocodes/en/41.bson`) are appended verbatim.
     */
    baseUrl: string;
    /**
     * Extra headers to attach to each fetch (e.g. `Authorization` for a
     * private bucket). Defaults to no extra headers.
     */
    headers?: Record<string, string>;
    /**
     * Per-request timeout in milliseconds. The loader uses `AbortSignal.timeout`
     * which is supported on Node 17.3+ and every edge runtime. Defaults to
     * 5000 ms.
     */
    timeoutMs?: number;
    /**
     * Optional `fetch` override (tests inject `mock-fetch`; some runtimes prefer
     * a custom implementation). Defaults to `globalThis.fetch`.
     */
    fetch?: typeof fetch;
}
export declare class FetchResourceLoader implements ResourceLoader {
    private readonly baseUrl;
    private readonly headers;
    private readonly timeoutMs;
    private readonly fetchImpl;
    constructor(options: FetchResourceLoaderOptions);
    loadResource(path: string): Promise<Uint8Array | null>;
}