/**
 * Appends query parameters to a URL string.
 * Handles both URLs with existing query strings and those without.
 *
 * @param url - The base URL to append parameters to. Can be absolute or relative
 *              (relative URLs are resolved against the current window location).
 * @param params - An object containing key-value pairs to add as query parameters
 * @returns The complete URL with the new parameters appended
 *
 * @example
 * ```typescript
 * // Add parameters to a URL without existing query string
 * addParamToURL('https://example.com/page', { foo: 'bar' });
 * // Returns: 'https://example.com/page?foo=bar'
 *
 * // Add parameters to a URL with existing query string
 * addParamToURL('https://example.com/page?existing=value', { foo: 'bar' });
 * // Returns: 'https://example.com/page?existing=value&foo=bar'
 * ```
 */
export default function addParamToURL(url: string, params: Record<string, string>): string;
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