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extname.ts
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extname.ts
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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
import { extname as posixExtname } from "../path/posix/extname.ts";
import { strip } from "./_strip.ts";
/**
* Returns the file extension of a given URL or string with leading period.
*
* The extension is sourced from the path portion of the URL. If there is no
* extension, an empty string is returned.
*
* @param url The URL from which to extract the extension.
* @returns The extension of the URL.
*
* @example Basic usage
* ```ts
* import { extname } from "https://deno.land/std@$STD_VERSION/url/extname.ts";
*
* extname("https://deno.land/std/path/mod.ts"); // ".ts"
*
* extname("https://deno.land/std/path/mod"); // ""
*
* extname("https://deno.land/std/path/mod.ts?a=b"); // ".ts"
*
* extname("https://deno.land/"); // ""
* ```
*/
export function extname(url: string | URL): string {
url = new URL(url);
strip(url);
return posixExtname(url.pathname);
}