/**
 * Implementation of <https://html.spec.whatwg.org/multipage/semantics.html#shared-declarative-refresh-steps>.
 *
 * @param {string} input
 * @param {Readonly<URL>} from
 * @returns {URL | undefined}
 */
export function sharedDeclarativeRefresh(input: string, from: Readonly<URL>): URL | undefined;
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