import { Agent as Undici6Agent } from 'undici_v6';
import { Agent as Undici7Agent } from 'undici_v7';
import { Agent as Undici8Agent } from 'undici_v8';
export type UndiciAgent = Undici6Agent | Undici7Agent | Undici8Agent;
/**
 * The subset of undici's `Agent.Options` that is stable across the undici major
 * versions supported here.
 */
export type UndiciAgentOptions = {
    /** Milliseconds allowed for the connection phase (TCP + TLS). */
    connectTimeout?: number;
};
/**
 * Builds an undici {@link UndiciAgent} from the same major version of undici as
 * the one embedded in the running NodeJS.
 *
 * @note Major versions of undici are not guaranteed to be backwards compatible,
 * so a dispatcher can only be passed to a `fetch()` backed by the same major
 * version. Since `globalThis.fetch` is backed by the undici NodeJS embeds, the
 * dispatcher must be built from that same major version, which is not
 * necessarily the version this package depends on.
 */
export declare function createUndiciAgent(options?: UndiciAgentOptions): UndiciAgent;
/**
 * Wraps the global fetch so that every request is issued through the given
 * undici dispatcher.
 */
export declare function dispatcherFetch(dispatcher: UndiciAgent): typeof globalThis.fetch;
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