/**
 * Return the extension of the `path` with leading period.
 *
 * @example Usage
 * ```ts
 * import { extname } from "@std/path/posix/extname";
 * import { assertEquals } from "@std/assert/assert-equals";
 *
 * assertEquals(extname("/home/user/Documents/file.ts"), ".ts");
 * assertEquals(extname("/home/user/Documents/"), "");
 * assertEquals(extname("/home/user/Documents/image.png"), ".png");
 * ```
 *
 * @param path The path to get the extension from.
 * @returns The extension (ex. for `file.ts` returns `.ts`).
 */
export declare function extname(path: string): string;
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