import type { RouteHandler } from "../types.js";
/**
 * Defines a default handler that's called when no routes explicitly
 * match the incoming request.
 *
 * Without a default handler, unmatched requests will go against the
 * network as if there were no service worker present.
 *
 * @param handler A callback function that returns a promise resulting in a response.
 * @deprecated
 */
export declare const setDefaultHandler: (handler: RouteHandler) => void;
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