/**
 * Checks whether a given path is a local (relative) link.
 *
 * A local link is considered valid if:
 * - It is not `null` or `undefined`.
 * - It does not start with a protocol (e.g., `http://`, `https://`, `ftp://`, etc.).
 * - It does not start with `//` (protocol-relative URL).
 * - It does not start with `mailto:`.
 *
 * @param path - The input string (or null/undefined).
 * @returns `true` if the path is a local link, otherwise `false`.
 *
 * @example
 * isLocalLink('/docs/guide');        // true
 * isLocalLink('about/team');         // true
 * isLocalLink('https://example.com') // false
 * isLocalLink('//cdn.example.com')   // false
 * isLocalLink('mailto:test@test.com')// false
 */
export declare const isLocalLink: (path: string | null | undefined) => path is string;
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