fix(ext/node): Match punycode module behavior to node (#22847)

Fixes #19214.

We were using the `idna` crate to implement our polyfill for
`punycode.toASCII` and `punycode.toUnicode`. The `idna` crate is
correct, and adheres to the IDNA2003/2008 spec, but it turns out
`node`'s implementations don't really follow any spec! Instead, node
splits the domain by `'.'` and punycode encodes/decodes each part. This
means that node's implementations will happily work on codepoints that
are disallowed by the IDNA specs, causing the error in #19214.

While fixing this, I went ahead and matched the node behavior on all of
the punycode functions and enabled node's punycode test in our
`node_compat` suite.

ext/node/lib.rs

@@ -261,6 +261,8 @@ deno_core::extension!(deno_node,
     ops::v8::op_vm_run_in_new_context,
     ops::idna::op_node_idna_domain_to_ascii,
     ops::idna::op_node_idna_domain_to_unicode,
+    ops::idna::op_node_idna_punycode_to_ascii,
+    ops::idna::op_node_idna_punycode_to_unicode,
     ops::idna::op_node_idna_punycode_decode,
     ops::idna::op_node_idna_punycode_encode,
     ops::zlib::op_zlib_new,

ext/node/ops/idna.rs

@@ -1,16 +1,126 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
 
-use deno_core::error::AnyError;
+use deno_core::anyhow::Error;
+use deno_core::error::range_error;
 use deno_core::op2;
 
+use std::borrow::Cow;
+
+// map_domain, to_ascii and to_unicode are based on the punycode implementation in node.js
+// https://github.com/nodejs/node/blob/73025c4dec042e344eeea7912ed39f7b7c4a3991/lib/punycode.js
+
+const PUNY_PREFIX: &str = "xn--";
+
+fn invalid_input_err() -> Error {
+  range_error("Invalid input")
+}
+
+fn not_basic_err() -> Error {
+  range_error("Illegal input >= 0x80 (not a basic code point)")
+}
+
+/// map a domain by mapping each label with the given function
+fn map_domain<E>(
+  domain: &str,
+  f: impl Fn(&str) -> Result<Cow<'_, str>, E>,
+) -> Result<String, E> {
+  let mut result = String::with_capacity(domain.len());
+  let mut domain = domain;
+
+  // if it's an email, leave the local part as is
+  let mut parts = domain.split('@');
+  if let (Some(local), Some(remaining)) = (parts.next(), parts.next()) {
+    result.push_str(local);
+    result.push('@');
+    domain = remaining;
+  }
+
+  // split into labels and map each one
+  for (i, label) in domain.split('.').enumerate() {
+    if i > 0 {
+      result.push('.');
+    }
+    result.push_str(&f(label)?);
+  }
+  Ok(result)
+}
+
+/// Maps a unicode domain to ascii by punycode encoding each label
+///
+/// Note this is not IDNA2003 or IDNA2008 compliant, rather it matches node.js's punycode implementation
+fn to_ascii(input: &str) -> Result<String, Error> {
+  if input.is_ascii() {
+    return Ok(input.into());
+  }
+
+  let mut result = String::with_capacity(input.len()); // at least as long as input
+
+  let rest = map_domain(input, |label| {
+    if label.is_ascii() {
+      Ok(label.into())
+    } else {
+      idna::punycode::encode_str(label)
+        .map(|encoded| [PUNY_PREFIX, &encoded].join("").into()) // add the prefix
+        .ok_or_else(|| {
+          Error::msg("Input would take more than 63 characters to encode") // only error possible per the docs
+        })
+    }
+  })?;
+
+  result.push_str(&rest);
+  Ok(result)
+}
+
+/// Maps an ascii domain to unicode by punycode decoding each label
+///
+/// Note this is not IDNA2003 or IDNA2008 compliant, rather it matches node.js's punycode implementation
+fn to_unicode(input: &str) -> Result<String, Error> {
+  map_domain(input, |s| {
+    if let Some(puny) = s.strip_prefix(PUNY_PREFIX) {
+      // it's a punycode encoded label
+      Ok(
+        idna::punycode::decode_to_string(&puny.to_lowercase())
+          .ok_or_else(invalid_input_err)?
+          .into(),
+      )
+    } else {
+      Ok(s.into())
+    }
+  })
+}
+
+/// Converts a domain to unicode with behavior that is
+/// compatible with the `punycode` module in node.js
+#[op2]
+#[string]
+pub fn op_node_idna_punycode_to_ascii(
+  #[string] domain: String,
+) -> Result<String, Error> {
+  to_ascii(&domain)
+}
+
+/// Converts a domain to ASCII with behavior that is
+/// compatible with the `punycode` module in node.js
+#[op2]
+#[string]
+pub fn op_node_idna_punycode_to_unicode(
+  #[string] domain: String,
+) -> Result<String, Error> {
+  to_unicode(&domain)
+}
+
+/// Converts a domain to ASCII as per the IDNA spec
+/// (specifically UTS #46)
 #[op2]
 #[string]
 pub fn op_node_idna_domain_to_ascii(
   #[string] domain: String,
-) -> Result<String, AnyError> {
-  Ok(idna::domain_to_ascii(&domain)?)
+) -> Result<String, Error> {
+  idna::domain_to_ascii(&domain).map_err(|e| e.into())
 }
 
+/// Converts a domain to Unicode as per the IDNA spec
+/// (specifically UTS #46)
 #[op2]
 #[string]
 pub fn op_node_idna_domain_to_unicode(#[string] domain: String) -> String {
@@ -19,8 +129,29 @@ pub fn op_node_idna_domain_to_unicode(#[string] domain: String) -> String {
 
 #[op2]
 #[string]
-pub fn op_node_idna_punycode_decode(#[string] domain: String) -> String {
-  idna::punycode::decode_to_string(&domain).unwrap_or_default()
+pub fn op_node_idna_punycode_decode(
+  #[string] domain: String,
+) -> Result<String, Error> {
+  if domain.is_empty() {
+    return Ok(domain);
+  }
+
+  // all code points before the last delimiter must be basic
+  // see https://github.com/nodejs/node/blob/73025c4dec042e344eeea7912ed39f7b7c4a3991/lib/punycode.js#L215-L227
+  let last_dash = domain.len()
+    - 1
+    - domain
+      .bytes()
+      .rev()
+      .position(|b| b == b'-')
+      .unwrap_or(domain.len() - 1);
+
+  if !domain[..last_dash].is_ascii() {
+    return Err(not_basic_err());
+  }
+
+  idna::punycode::decode_to_string(&domain)
+    .ok_or_else(|| deno_core::error::range_error("Invalid input"))
 }
 
 #[op2]

ext/node/polyfills/dns.ts

@@ -92,7 +92,7 @@ import {
   GetAddrInfoReqWrap,
   QueryReqWrap,
 } from "ext:deno_node/internal_binding/cares_wrap.ts";
-import { toASCII } from "node:punycode";
+import { domainToASCII } from "ext:deno_node/internal/idna.ts";
 import { notImplemented } from "ext:deno_node/_utils.ts";
 
 function onlookup(
@@ -264,7 +264,13 @@ export function lookup(
   req.hostname = hostname;
   req.oncomplete = all ? onlookupall : onlookup;
 
-  const err = getaddrinfo(req, toASCII(hostname), family, hints, verbatim);
+  const err = getaddrinfo(
+    req,
+    domainToASCII(hostname),
+    family,
+    hints,
+    verbatim,
+  );
 
   if (err) {
     nextTick(
@@ -332,7 +338,7 @@ function resolver(bindingName: keyof ChannelWrapQuery) {
 
     req.ttl = !!(options && (options as ResolveOptions).ttl);
 
-    const err = this._handle[bindingName](req, toASCII(name));
+    const err = this._handle[bindingName](req, domainToASCII(name));
 
     if (err) {
       throw dnsException(err, bindingName, name);

ext/node/polyfills/internal/idna.ts

@@ -51,6 +51,11 @@
 
 "use strict";
 
+import {
+  op_node_idna_domain_to_ascii,
+  op_node_idna_domain_to_unicode,
+} from "ext:core/ops";
+
 /**
  * Creates an array containing the numeric code points of each Unicode
  * character in the string. While JavaScript uses UCS-2 internally,
@@ -105,3 +110,17 @@ export const ucs2 = {
   decode: ucs2decode,
   encode: ucs2encode,
 };
+
+/**
+ *  Converts a domain to ASCII as per the IDNA spec
+ */
+export function domainToASCII(domain: string) {
+  return op_node_idna_domain_to_ascii(domain);
+}
+
+/**
+ *  Converts a domain to Unicode as per the IDNA spec
+ */
+export function domainToUnicode(domain: string) {
+  return op_node_idna_domain_to_unicode(domain);
+}

ext/node/polyfills/punycode.ts

@@ -1,28 +1,40 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
 
 import {
-  op_node_idna_domain_to_ascii,
-  op_node_idna_domain_to_unicode,
   op_node_idna_punycode_decode,
   op_node_idna_punycode_encode,
+  op_node_idna_punycode_to_ascii,
+  op_node_idna_punycode_to_unicode,
 } from "ext:core/ops";
 
+import { deprecate } from "node:util";
+
 import { ucs2 } from "ext:deno_node/internal/idna.ts";
 
+// deno-lint-ignore no-explicit-any
+function punyDeprecated(fn: any) {
+  return deprecate(
+    fn,
+    "The `punycode` module is deprecated. Please use a userland " +
+      "alternative instead.",
+    "DEP0040",
+  );
+}
+
 function toASCII(domain) {
-  return op_node_idna_domain_to_ascii(domain);
+  return punyDeprecated(op_node_idna_punycode_to_ascii)(domain);
 }
 
 function toUnicode(domain) {
-  return op_node_idna_domain_to_unicode(domain);
+  return punyDeprecated(op_node_idna_punycode_to_unicode)(domain);
 }
 
 function decode(domain) {
-  return op_node_idna_punycode_decode(domain);
+  return punyDeprecated(op_node_idna_punycode_decode)(domain);
 }
 
 function encode(domain) {
-  return op_node_idna_punycode_encode(domain);
+  return punyDeprecated(op_node_idna_punycode_encode)(domain);
 }
 
 export { decode, encode, toASCII, toUnicode, ucs2 };

ext/node/polyfills/url.ts

@@ -70,7 +70,10 @@ import {
   CHAR_ZERO_WIDTH_NOBREAK_SPACE,
 } from "ext:deno_node/path/_constants.ts";
 import * as path from "node:path";
-import { toASCII, toUnicode } from "node:punycode";
+import {
+  domainToASCII as idnaToASCII,
+  domainToUnicode as idnaToUnicode,
+} from "ext:deno_node/internal/idna.ts";
 import { isWindows, osType } from "ext:deno_node/_util/os.ts";
 import { encodeStr, hexTable } from "ext:deno_node/internal/querystring.ts";
 import querystring from "node:querystring";
@@ -813,7 +816,7 @@ export class Url {
 
           // Use lenient mode (`true`) to try to support even non-compliant
           // URLs.
-          this.hostname = toASCII(this.hostname);
+          this.hostname = idnaToASCII(this.hostname);
 
           // Prevent two potential routes of hostname spoofing.
           // 1. If this.hostname is empty, it must have become empty due to toASCII
@@ -1251,7 +1254,7 @@ export function resolveObject(source: string | Url, relative: string) {
  * @see https://www.rfc-editor.org/rfc/rfc3490#section-4
  */
 export function domainToASCII(domain: string) {
-  return toASCII(domain);
+  return idnaToASCII(domain);
 }
 
 /**
@@ -1261,7 +1264,7 @@ export function domainToASCII(domain: string) {
  * @see https://www.rfc-editor.org/rfc/rfc3490#section-4
  */
 export function domainToUnicode(domain: string) {
-  return toUnicode(domain);
+  return idnaToUnicode(domain);
 }
 
 /**
@@ -1396,7 +1399,7 @@ export function pathToFileURL(filepath: string): URL {
       );
     }
 
-    outURL.hostname = domainToASCII(hostname);
+    outURL.hostname = idnaToASCII(hostname);
     outURL.pathname = encodePathChars(paths.slice(3).join("/"));
   } else {
     let resolved = path.resolve(filepath);

tests/integration/node_unit_tests.rs

@@ -77,6 +77,7 @@ util::unit_test_factory!(
     path_test,
     perf_hooks_test,
     process_test,
+    punycode_test,
     querystring_test,
     readline_test,
     repl_test,

tests/node_compat/config.jsonc

@@ -456,6 +456,7 @@
       "test-process-uptime.js",
       "test-promise-unhandled-silent.js",
       "test-promise-unhandled-throw-handler.js",
+      "test-punycode.js",
       "test-querystring-escape.js",
       "test-querystring-maxKeys-non-finite.js",
       "test-querystring-multichar-separator.js",

tests/node_compat/test/parallel/test-punycode.js

@@ -0,0 +1,280 @@
+// deno-fmt-ignore-file
+// deno-lint-ignore-file
+
+// Copyright Joyent and Node contributors. All rights reserved. MIT license.
+// Taken from Node 18.12.1
+// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.
+
+// Flags: --pending-deprecation
+
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+'use strict';
+const common = require('../common');
+
+const punycodeWarning =
+  'The `punycode` module is deprecated. Please use a userland alternative ' +
+  'instead.';
+common.expectWarning('DeprecationWarning', punycodeWarning, 'DEP0040');
+
+const punycode = require('punycode');
+const assert = require('assert');
+
+assert.strictEqual(punycode.encode('ü'), 'tda');
+assert.strictEqual(punycode.encode('Goethe'), 'Goethe-');
+assert.strictEqual(punycode.encode('Bücher'), 'Bcher-kva');
+assert.strictEqual(
+  punycode.encode(
+    'Willst du die Blüthe des frühen, die Früchte des späteren Jahres'
+  ),
+  'Willst du die Blthe des frhen, die Frchte des spteren Jahres-x9e96lkal'
+);
+assert.strictEqual(punycode.encode('日本語'), 'wgv71a119e');
+assert.strictEqual(punycode.encode('𩸽'), 'x73l');
+
+assert.strictEqual(punycode.decode('tda'), 'ü');
+assert.strictEqual(punycode.decode('Goethe-'), 'Goethe');
+assert.strictEqual(punycode.decode('Bcher-kva'), 'Bücher');
+assert.strictEqual(
+  punycode.decode(
+    'Willst du die Blthe des frhen, die Frchte des spteren Jahres-x9e96lkal'
+  ),
+  'Willst du die Blüthe des frühen, die Früchte des späteren Jahres'
+);
+assert.strictEqual(punycode.decode('wgv71a119e'), '日本語');
+assert.strictEqual(punycode.decode('x73l'), '𩸽');
+assert.throws(() => {
+  punycode.decode(' ');
+}, /^RangeError: Invalid input$/);
+assert.throws(() => {
+  punycode.decode('α-');
+}, /^RangeError: Illegal input >= 0x80 \(not a basic code point\)$/);
+assert.throws(() => {
+  punycode.decode('あ');
+}, /^RangeError: Invalid input$/);
+
+// http://tools.ietf.org/html/rfc3492#section-7.1
+const tests = [
+  // (A) Arabic (Egyptian)
+  {
+    encoded: 'egbpdaj6bu4bxfgehfvwxn',
+    decoded: '\u0644\u064A\u0647\u0645\u0627\u0628\u062A\u0643\u0644\u0645' +
+      '\u0648\u0634\u0639\u0631\u0628\u064A\u061F'
+  },
+
+  // (B) Chinese (simplified)
+  {
+    encoded: 'ihqwcrb4cv8a8dqg056pqjye',
+    decoded: '\u4ED6\u4EEC\u4E3A\u4EC0\u4E48\u4E0D\u8BF4\u4E2D\u6587'
+  },
+
+  // (C) Chinese (traditional)
+  {
+    encoded: 'ihqwctvzc91f659drss3x8bo0yb',
+    decoded: '\u4ED6\u5011\u7232\u4EC0\u9EBD\u4E0D\u8AAA\u4E2D\u6587'
+  },
+
+  // (D) Czech: Pro<ccaron>prost<ecaron>nemluv<iacute><ccaron>esky
+  {
+    encoded: 'Proprostnemluvesky-uyb24dma41a',
+    decoded: '\u0050\u0072\u006F\u010D\u0070\u0072\u006F\u0073\u0074\u011B' +
+      '\u006E\u0065\u006D\u006C\u0075\u0076\u00ED\u010D\u0065\u0073\u006B\u0079'
+  },
+
+  // (E) Hebrew
+  {
+    encoded: '4dbcagdahymbxekheh6e0a7fei0b',
+    decoded: '\u05DC\u05DE\u05D4\u05D4\u05DD\u05E4\u05E9\u05D5\u05D8\u05DC' +
+      '\u05D0\u05DE\u05D3\u05D1\u05E8\u05D9\u05DD\u05E2\u05D1\u05E8\u05D9\u05EA'
+  },
+
+  // (F) Hindi (Devanagari)
+  {
+    encoded: 'i1baa7eci9glrd9b2ae1bj0hfcgg6iyaf8o0a1dig0cd',
+    decoded: '\u092F\u0939\u0932\u094B\u0917\u0939\u093F\u0928\u094D\u0926' +
+      '\u0940\u0915\u094D\u092F\u094B\u0902\u0928\u0939\u0940\u0902\u092C' +
+      '\u094B\u0932\u0938\u0915\u0924\u0947\u0939\u0948\u0902'
+  },
+
+  // (G) Japanese (kanji and hiragana)
+  {
+    encoded: 'n8jok5ay5dzabd5bym9f0cm5685rrjetr6pdxa',
+    decoded: '\u306A\u305C\u307F\u3093\u306A\u65E5\u672C\u8A9E\u3092\u8A71' +
+      '\u3057\u3066\u304F\u308C\u306A\u3044\u306E\u304B'
+  },
+
+  // (H) Korean (Hangul syllables)
+  {
+    encoded: '989aomsvi5e83db1d2a355cv1e0vak1dwrv93d5xbh15a0dt30a5jpsd879' +
+      'ccm6fea98c',
+    decoded: '\uC138\uACC4\uC758\uBAA8\uB4E0\uC0AC\uB78C\uB4E4\uC774\uD55C' +
+      '\uAD6D\uC5B4\uB97C\uC774\uD574\uD55C\uB2E4\uBA74\uC5BC\uB9C8\uB098' +
+      '\uC88B\uC744\uAE4C'
+  },
+
+  // (I) Russian (Cyrillic)
+  {
+    encoded: 'b1abfaaepdrnnbgefbadotcwatmq2g4l',
+    decoded: '\u043F\u043E\u0447\u0435\u043C\u0443\u0436\u0435\u043E\u043D' +
+      '\u0438\u043D\u0435\u0433\u043E\u0432\u043E\u0440\u044F\u0442\u043F' +
+      '\u043E\u0440\u0443\u0441\u0441\u043A\u0438'
+  },
+
+  // (J) Spanish: Porqu<eacute>nopuedensimplementehablarenEspa<ntilde>ol
+  {
+    encoded: 'PorqunopuedensimplementehablarenEspaol-fmd56a',
+    decoded: '\u0050\u006F\u0072\u0071\u0075\u00E9\u006E\u006F\u0070\u0075' +
+      '\u0065\u0064\u0065\u006E\u0073\u0069\u006D\u0070\u006C\u0065\u006D' +
+      '\u0065\u006E\u0074\u0065\u0068\u0061\u0062\u006C\u0061\u0072\u0065' +
+      '\u006E\u0045\u0073\u0070\u0061\u00F1\u006F\u006C'
+  },
+
+  // (K) Vietnamese: T<adotbelow>isaoh<odotbelow>kh<ocirc>ngth
+  // <ecirchookabove>ch<ihookabove>n<oacute>iti<ecircacute>ngVi<ecircdotbelow>t
+  {
+    encoded: 'TisaohkhngthchnitingVit-kjcr8268qyxafd2f1b9g',
+    decoded: '\u0054\u1EA1\u0069\u0073\u0061\u006F\u0068\u1ECD\u006B\u0068' +
+      '\u00F4\u006E\u0067\u0074\u0068\u1EC3\u0063\u0068\u1EC9\u006E\u00F3' +
+      '\u0069\u0074\u0069\u1EBF\u006E\u0067\u0056\u0069\u1EC7\u0074'
+  },
+
+  // (L) 3<nen>B<gumi><kinpachi><sensei>
+  {
+    encoded: '3B-ww4c5e180e575a65lsy2b',
+    decoded: '\u0033\u5E74\u0042\u7D44\u91D1\u516B\u5148\u751F'
+  },
+
+  // (M) <amuro><namie>-with-SUPER-MONKEYS
+  {
+    encoded: '-with-SUPER-MONKEYS-pc58ag80a8qai00g7n9n',
+    decoded: '\u5B89\u5BA4\u5948\u7F8E\u6075\u002D\u0077\u0069\u0074\u0068' +
+      '\u002D\u0053\u0055\u0050\u0045\u0052\u002D\u004D\u004F\u004E\u004B' +
+      '\u0045\u0059\u0053'
+  },
+
+  // (N) Hello-Another-Way-<sorezore><no><basho>
+  {
+    encoded: 'Hello-Another-Way--fc4qua05auwb3674vfr0b',
+    decoded: '\u0048\u0065\u006C\u006C\u006F\u002D\u0041\u006E\u006F\u0074' +
+      '\u0068\u0065\u0072\u002D\u0057\u0061\u0079\u002D\u305D\u308C\u305E' +
+      '\u308C\u306E\u5834\u6240'
+  },
+
+  // (O) <hitotsu><yane><no><shita>2
+  {
+    encoded: '2-u9tlzr9756bt3uc0v',
+    decoded: '\u3072\u3068\u3064\u5C4B\u6839\u306E\u4E0B\u0032'
+  },
+
+  // (P) Maji<de>Koi<suru>5<byou><mae>
+  {
+    encoded: 'MajiKoi5-783gue6qz075azm5e',
+    decoded: '\u004D\u0061\u006A\u0069\u3067\u004B\u006F\u0069\u3059\u308B' +
+      '\u0035\u79D2\u524D'
+  },
+
+  // (Q) <pafii>de<runba>
+  {
+    encoded: 'de-jg4avhby1noc0d',
+    decoded: '\u30D1\u30D5\u30A3\u30FC\u0064\u0065\u30EB\u30F3\u30D0'
+  },
+
+  // (R) <sono><supiido><de>
+  {
+    encoded: 'd9juau41awczczp',
+    decoded: '\u305D\u306E\u30B9\u30D4\u30FC\u30C9\u3067'
+  },
+
+  // (S) -> $1.00 <-
+  {
+    encoded: '-> $1.00 <--',
+    decoded: '\u002D\u003E\u0020\u0024\u0031\u002E\u0030\u0030\u0020\u003C' +
+      '\u002D'
+  },
+];
+
+let errors = 0;
+const handleError = (error, name) => {
+  console.error(
+    `FAIL: ${name} expected ${error.expected}, got ${error.actual}`
+  );
+  errors++;
+};
+
+const regexNonASCII = /[^\x20-\x7E]/;
+const testBattery = {
+  encode: (test) => assert.strictEqual(
+    punycode.encode(test.decoded),
+    test.encoded
+  ),
+  decode: (test) => assert.strictEqual(
+    punycode.decode(test.encoded),
+    test.decoded
+  ),
+  toASCII: (test) => assert.strictEqual(
+    punycode.toASCII(test.decoded),
+    regexNonASCII.test(test.decoded) ?
+      `xn--${test.encoded}` :
+      test.decoded
+  ),
+  toUnicode: (test) => assert.strictEqual(
+    punycode.toUnicode(
+      regexNonASCII.test(test.decoded) ?
+        `xn--${test.encoded}` :
+        test.decoded
+    ),
+    regexNonASCII.test(test.decoded) ?
+      test.decoded.toLowerCase() :
+      test.decoded
+  )
+};
+
+tests.forEach((testCase) => {
+  Object.keys(testBattery).forEach((key) => {
+    try {
+      testBattery[key](testCase);
+    } catch (error) {
+      handleError(error, key);
+    }
+  });
+});
+
+// BMP code point
+assert.strictEqual(punycode.ucs2.encode([0x61]), 'a');
+// Supplementary code point (surrogate pair)
+assert.strictEqual(punycode.ucs2.encode([0x1D306]), '\uD834\uDF06');
+// high surrogate
+assert.strictEqual(punycode.ucs2.encode([0xD800]), '\uD800');
+// High surrogate followed by non-surrogates
+assert.strictEqual(punycode.ucs2.encode([0xD800, 0x61, 0x62]), '\uD800ab');
+// low surrogate
+assert.strictEqual(punycode.ucs2.encode([0xDC00]), '\uDC00');
+// Low surrogate followed by non-surrogates
+assert.strictEqual(punycode.ucs2.encode([0xDC00, 0x61, 0x62]), '\uDC00ab');
+
+assert.strictEqual(errors, 0);
+
+// test map domain
+assert.strictEqual(punycode.toASCII('Bücher@日本語.com'),
+                   'Bücher@xn--wgv71a119e.com');
+assert.strictEqual(punycode.toUnicode('Bücher@xn--wgv71a119e.com'),
+                   'Bücher@日本語.com');

tests/unit_node/punycode_test.ts

@@ -0,0 +1,16 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+
+import * as punycode from "node:punycode";
+import { assertEquals } from "@std/assert/mod.ts";
+
+Deno.test("regression #19214", () => {
+  const input = "个<><E4B8AA>.hk";
+
+  assertEquals(punycode.toASCII(input), "xn--ciq6844ba.hk");
+
+  assertEquals(punycode.toUnicode("xn--ciq6844ba.hk"), input);
+});
+
+Deno.test("Decode empty input", () => {
+  assertEquals(punycode.decode(""), "");
+});

tools/node_compat/TODO.md

@@ -3,7 +3,7 @@
 
 NOTE: This file should not be manually edited. Please edit `tests/node_compat/config.json` and run `deno task setup` in `tools/node_compat` dir instead.
 
-Total: 2997
+Total: 2996
 
 - [abort/test-abort-backtrace.js](https://github.com/nodejs/node/tree/v18.12.1/test/abort/test-abort-backtrace.js)
 - [abort/test-abort-fatal-error.js](https://github.com/nodejs/node/tree/v18.12.1/test/abort/test-abort-fatal-error.js)
@@ -1937,7 +1937,6 @@ Total: 2997
 - [parallel/test-promises-unhandled-rejections.js](https://github.com/nodejs/node/tree/v18.12.1/test/parallel/test-promises-unhandled-rejections.js)
 - [parallel/test-promises-unhandled-symbol-rejections.js](https://github.com/nodejs/node/tree/v18.12.1/test/parallel/test-promises-unhandled-symbol-rejections.js)
 - [parallel/test-promises-warning-on-unhandled-rejection.js](https://github.com/nodejs/node/tree/v18.12.1/test/parallel/test-promises-warning-on-unhandled-rejection.js)
-- [parallel/test-punycode.js](https://github.com/nodejs/node/tree/v18.12.1/test/parallel/test-punycode.js)
 - [parallel/test-queue-microtask-uncaught-asynchooks.js](https://github.com/nodejs/node/tree/v18.12.1/test/parallel/test-queue-microtask-uncaught-asynchooks.js)
 - [parallel/test-queue-microtask.js](https://github.com/nodejs/node/tree/v18.12.1/test/parallel/test-queue-microtask.js)
 - [parallel/test-readable-from-iterator-closing.js](https://github.com/nodejs/node/tree/v18.12.1/test/parallel/test-readable-from-iterator-closing.js)