/**
 * Resolve a `serviceWorkerUrl` option the way a page would: relative to the
 * current document. Absolute urls pass through untouched. A url that cannot
 * be resolved is reported with the option name and the offending value,
 * because the raw `TypeError: Failed to construct 'URL': Invalid URL` says
 * neither.
 */
export declare function resolveWorkerUrl(serviceWorkerUrl: string): URL;
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