/**
 * Checks whether `src` is a sub-directory of `dest`.
 *
 * @param src Source file path as a string or URL.
 * @param dest Destination file path as a string or URL.
 * @param sep Path separator. Defaults to `\\` for Windows and `/` for other
 * platforms.
 *
 * @returns `true` if `src` is a sub-directory of `dest`, `false` otherwise.
 */
export declare function isSubdir(src: string | URL, dest: string | URL, sep?: "\\" | "/"): boolean;
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