/**
 * io/broker.ts
 *
 * The I/O broker: runs in its own worker (spawned from the same worker.js
 * via an 'init-broker' first message — it never loads the WASM). It owns the
 * block cache shared by every decode worker and serves their synchronous
 * read requests: requests arrive as port messages, replies for a blocked
 * worker go exclusively through that worker's SAB channel (data → SEQ →
 * STATUS last → notify). Backends: HTTP range requests for URLs, File.slice
 * for local files — both async, parallel, and deduped.
 */
import type { IoConfig } from './protocol.js';
export declare class IoBroker {
    private readonly config;
    private readonly store;
    private files;
    private statInflight;
    constructor(config: IoConfig);
    /** Wire one decode worker's channel (its MessagePort + SAB). */
    attachChannel(port: MessagePort, sab: SharedArrayBuffer): void;
    private onRequest;
    private handleRead;
    private handleRegisterUrl;
    /**
     * Determine a remote file's size. Servers without range support get the
     * legacy createLazyFile treatment: the whole body is downloaded once and
     * served from memory.
     */
    private statUrl;
    private fetchRange;
}
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