import type { EdictHostAdapter } from "./host-adapter.js";
/** Options for CloudflareHostAdapter construction. */
export interface CloudflareHostAdapterOptions {
    /** Workers environment bindings. Lookups return "" for missing keys. */
    envBindings?: Record<string, string>;
}
/**
 * Cloudflare Workers runtime adapter.
 *
 * - Crypto: pure-JS SHA-256, MD5, HMAC (synchronous, no Web Crypto API)
 * - HTTP: returns structured error (Workers fetch is async, incompatible with sync host imports)
 * - File IO: returns structured error (Workers KV is async)
 * - env: configurable via constructor envBindings
 *
 * This adapter is designed for use in generated Worker scripts where WASM
 * host imports must be synchronous. All async-only operations return
 * structured errors naming the constraint.
 */
export declare class CloudflareHostAdapter implements EdictHostAdapter {
    private readonly envBindings;
    constructor(options?: CloudflareHostAdapterOptions);
    sha256(data: string): string;
    md5(data: string): string;
    hmac(algo: string, key: string, data: string): string;
    fetch(_url: string, _method: string, _body?: string): {
        ok: boolean;
        data: string;
    };
    readFile(_path: string): {
        ok: false;
        error: string;
    };
    writeFile(_path: string, _content: string): {
        ok: false;
        error: string;
    };
    env(name: string): string;
    args(): string[];
    exit(code: number): never;
}
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