/**
 * Resolves the URL of a `HYPERLINK` cell against the host document, and refuses anything that is not
 * a navigable link.
 *
 * The URL is parsed instead of pattern-matched, so obfuscations that survive a string comparison
 * (`JaVaScRiPt:`, `java\tscript:`, leading whitespace) are normalized before the protocol is read.
 *
 * @param {string} rawUrl The URL as reported by the formula engine.
 * @param {string} baseUrl The document URL that relative URLs are resolved against.
 * @returns {string|null} The resolved absolute URL, or `null` when the cell must not become a link.
 */
export declare function resolveHyperlinkUrl(rawUrl: string, baseUrl: string): string | null;