docs: add esm examples

doc/api/url.md

@@ -1012,7 +1012,22 @@ added: v10.12.0
 This function ensures the correct decodings of percent-encoded characters as
 well as ensuring a cross-platform valid absolute path string.
 
-```js
+```mjs
+import url from 'url';
+new URL('file:///C:/path/').pathname;      // Incorrect: /C:/path/
+url.fileURLToPath('file:///C:/path/');     // Correct:   C:\path\ (Windows)
+
+new URL('file://nas/foo.txt').pathname;    // Incorrect: /foo.txt
+url.fileURLToPath('file://nas/foo.txt');   // Correct:   \\nas\foo.txt (Windows)
+
+new URL('file:///你好.txt').pathname;      // Incorrect: /%E4%BD%A0%E5%A5%BD.txt
+url.fileURLToPath('file:///你好.txt');     // Correct:   /你好.txt (POSIX)
+
+new URL('file:///hello world').pathname;   // Incorrect: /hello%20world
+url.fileURLToPath('file:///hello world');  // Correct:   /hello world (POSIX)
+```
+
+```cjs
 const url = require('url');
 new URL('file:///C:/path/').pathname;      // Incorrect: /C:/path/
 url.fileURLToPath('file:///C:/path/');     // Correct:   C:\path\ (Windows)
@@ -1053,7 +1068,21 @@ string serializations of the URL. These are not, however, customizable in
 any way. The `url.format(URL[, options])` method allows for basic customization
 of the output.
 
-```js
+```mjs
+import url from 'url';
+const myURL = new URL('https://a:b@測試?abc#foo');
+
+console.log(myURL.href);
+// Prints https://a:b@xn--g6w251d/?abc#foo
+
+console.log(myURL.toString());
+// Prints https://a:b@xn--g6w251d/?abc#foo
+
+console.log(url.format(myURL, { fragment: false, unicode: true, auth: false }));
+// Prints 'https://測試/?abc'
+```
+
+```cjs
 const url = require('url');
 const myURL = new URL('https://a:b@測試?abc#foo');
 
@@ -1078,7 +1107,21 @@ added: v10.12.0
 This function ensures that `path` is resolved absolutely, and that the URL
 control characters are correctly encoded when converting into a File URL.
 
-```js
+```mjs
+import url from 'url';
+new URL(__filename);                  // Incorrect: throws (POSIX)
+new URL(__filename);                  // Incorrect: C:\... (Windows)
+url.pathToFileURL(__filename);        // Correct:   file:///... (POSIX)
+url.pathToFileURL(__filename);        // Correct:   file:///C:/... (Windows)
+
+new URL('/foo#1', 'file:');           // Incorrect: file:///foo#1
+url.pathToFileURL('/foo#1');          // Correct:   file:///foo%231 (POSIX)
+
+new URL('/some/path%.c', 'file:');   // Incorrect: file:///some/path%.c
+url.pathToFileURL('/some/path%.c');  // Correct:   file:///some/path%25.c (POSIX)
+```
+
+```cjs
 const url = require('url');
 new URL(__filename);                  // Incorrect: throws (POSIX)
 new URL(__filename);                  // Incorrect: C:\... (Windows)
@@ -1319,7 +1362,22 @@ changes:
 The `url.format()` method returns a formatted URL string derived from
 `urlObject`.
 
-```js
+```mjs
+import url from 'url';
+url.format({
+  protocol: 'https',
+  hostname: 'example.com',
+  pathname: '/some/path',
+  query: {
+    page: 1,
+    format: 'json'
+  }
+});
+
+// => 'https://example.com/some/path?page=1&format=json'
+```
+
+```cjs
 const url = require('url');
 url.format({
   protocol: 'https',
@@ -1473,7 +1531,14 @@ changes:
 The `url.resolve()` method resolves a target URL relative to a base URL in a
 manner similar to that of a Web browser resolving an anchor tag HREF.
 
-```js
+```mjs
+import url from 'url';
+url.resolve('/one/two/three', 'four');         // '/one/two/four'
+url.resolve('http://example.com/', '/one');    // 'http://example.com/one'
+url.resolve('http://example.com/one', '/two'); // 'http://example.com/two'
+```
+
+```cjs
 const url = require('url');
 url.resolve('/one/two/three', 'four');         // '/one/two/four'
 url.resolve('http://example.com/', '/one');    // 'http://example.com/one'