import React from 'react';
import type { Fetcher, PreviewFile, RequestHandler, RequestInitFactory, ShouldFetchAsBlob } from '@eternalheart/file-preview-core';
export interface RequestContextValue {
    fetcher: Fetcher;
    shouldFetchAsBlob?: ShouldFetchAsBlob;
}
export interface RequestProviderProps {
    requestInit?: RequestInitFactory;
    requestHandler?: RequestHandler;
    shouldFetchAsBlob?: ShouldFetchAsBlob;
    children: React.ReactNode;
}
export declare const RequestProvider: React.FC<RequestProviderProps>;
export declare function useRequest(): RequestContextValue;
export declare function useFetcher(): Fetcher;
/**
 * 解析 file 的可消费 URL：
 * - 未配置 shouldFetchAsBlob 或返回 false：同步返回 file.url（不入 state，避免切换文件时残留旧值）
 * - 返回 true：用 fetcher 拉成 blob: URL，组件卸载或 file 变化时 revoke
 *
 * 期间返回空字符串（表示 "还没准备好"），调用方应避免空 URL 时挂载到 <img src> 等。
 */
export declare function useResolvedUrl(file: PreviewFile | undefined): string;
//# sourceMappingURL=RequestContext.d.ts.map