/** undici header/body timer used for a forward whose deadline is `deadlineMs`. */
export declare function localAgentChannelDispatcherTimeoutMs(deadlineMs: number): number;
/**
 * `fetch` options for a local-agent channel forward that may run for
 * `deadlineMs`: an AbortSignal at the deadline, and a dispatcher that does not
 * give up before it.
 */
export declare function localAgentChannelFetchInit(deadlineMs: number): RequestInit;
/**
 * True when undici's own header or body timer ended the request
 * (`UND_ERR_HEADERS_TIMEOUT` / `UND_ERR_BODY_TIMEOUT`). fetch reports them as
 * `TypeError('fetch failed')` or `TypeError('terminated')` with the timer error
 * as `cause`. Either way the forward reached the agent and went unanswered, so
 * callers must report a timeout and must not retry the turn on another target.
 */
export declare function isUndiciResponseTimeoutError(err: unknown): boolean;
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