doc: add ESM code examples in url.md

doc/api/url.md

@@ -9,7 +9,11 @@
 The `url` module provides utilities for URL resolution and parsing. It can be
 accessed using:
 
-```js
+```mjs
+import url from 'url';
+```
+
+```cjs
 const url = require('url');
 ```
 
@@ -61,7 +65,13 @@ const myURL =
 
 Parsing the URL string using the Legacy API:
 
-```js
+```mjs
+import url from 'url';
+const myURL =
+  url.parse('https://user:pass@sub.example.com:8080/p/a/t/h?query=string#hash');
+```
+
+```cjs
 const url = require('url');
 const myURL =
   url.parse('https://user:pass@sub.example.com:8080/p/a/t/h?query=string#hash');
@@ -135,7 +145,12 @@ const myURL = new URL('/foo', 'https://example.org/');
 The URL constructor is accessible as a property on the global object.
 It can also be imported from the built-in url module:
 
-```js
+```mjs
+import { URL } from 'url';
+console.log(URL === globalThis.URL); // Prints 'true'.
+```
+
+```cjs
 console.log(URL === require('url').URL); // Prints 'true'.
 ```
 
@@ -573,10 +588,6 @@ and [`url.format()`][] methods would produce.
 The `toString()` method on the `URL` object returns the serialized URL. The
 value returned is equivalent to that of [`url.href`][] and [`url.toJSON()`][].
 
-Because of the need for standard compliance, this method does not allow users
-to customize the serialization process of the URL. For more flexibility,
-[`require('url').format()`][] method might be of interest.
-
 #### `url.toJSON()`
 
 * Returns: {string}
@@ -931,8 +942,20 @@ invalid domain, the empty string is returned.
 
 It performs the inverse operation to [`url.domainToUnicode()`][].
 
-```js
+```mjs
+import url from 'url';
+
+console.log(url.domainToASCII('español.com'));
+// Prints xn--espaol-zwa.com
+console.log(url.domainToASCII('中文.com'));
+// Prints xn--fiq228c.com
+console.log(url.domainToASCII('xn--iñvalid.com'));
+// Prints an empty string
+```
+
+```cjs
 const url = require('url');
+
 console.log(url.domainToASCII('español.com'));
 // Prints xn--espaol-zwa.com
 console.log(url.domainToASCII('中文.com'));
@@ -956,8 +979,20 @@ domain, the empty string is returned.
 
 It performs the inverse operation to [`url.domainToASCII()`][].
 
-```js
+```mjs
+import url from 'url';
+
+console.log(url.domainToUnicode('xn--espaol-zwa.com'));
+// Prints español.com
+console.log(url.domainToUnicode('xn--fiq228c.com'));
+// Prints 中文.com
+console.log(url.domainToUnicode('xn--iñvalid.com'));
+// Prints an empty string
+```
+
+```cjs
 const url = require('url');
+
 console.log(url.domainToUnicode('xn--espaol-zwa.com'));
 // Prints español.com
 console.log(url.domainToUnicode('xn--fiq228c.com'));
@@ -1079,7 +1114,26 @@ added: v15.7.0
 This utility function converts a URL object into an ordinary options object as
 expected by the [`http.request()`][] and [`https.request()`][] APIs.
 
-```js
+```mjs
+import { urlToHttpOptions } from 'url';
+const myURL = new URL('https://a:b@測試?abc#foo');
+
+console.log(urlToHttpOptions(myUrl));
+/**
+{
+  protocol: 'https:',
+  hostname: 'xn--g6w251d',
+  hash: '#foo',
+  search: '?abc',
+  pathname: '/',
+  path: '/?abc',
+  href: 'https://a:b@xn--g6w251d/?abc#foo',
+  auth: 'a:b'
+}
+*/
+```
+
+```cjs
 const { urlToHttpOptions } = require('url');
 const myURL = new URL('https://a:b@測試?abc#foo');
 
@@ -1124,8 +1178,8 @@ changes:
 
 > Stability: 3 - Legacy: Use the WHATWG URL API instead.
 
-The legacy `urlObject` (`require('url').Url`) is created and returned by the
-`url.parse()` function.
+The legacy `urlObject` (`require('url').Url` or `import { Url } from 'url'`) is
+created and returned by the `url.parse()` function.
 
 #### `urlObject.auth`
 
@@ -1499,7 +1553,6 @@ console.log(myURL.origin);
 [`https.request()`]: https.md#https_https_request_options_callback
 [`new URL()`]: #url_new_url_input_base
 [`querystring`]: querystring.md
-[`require('url').format()`]: #url_url_format_url_options
 [`url.domainToASCII()`]: #url_url_domaintoascii_domain
 [`url.domainToUnicode()`]: #url_url_domaintounicode_domain
 [`url.format()`]: #url_url_format_urlobject