lib: remove usc-2 encoding

Fixes: #21963
PR-URL: #21964
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: mscdex

benchmark/util/normalize-encoding.js

@@ -5,21 +5,19 @@ const assert = require('assert');
 
 const groupedInputs = {
   group_common: ['undefined', 'utf8', 'utf-8', 'base64',
-                 'binary', 'latin1', 'ucs-2', 'usc-2'],
+                 'binary', 'latin1', 'ucs-2'],
   group_upper: ['UTF-8', 'UTF8', 'UCS2', 'UTF-16LE',
-                'UTF16LE', 'BASE64', 'UCS-2', 'USC-2'],
+                'UTF16LE', 'BASE64', 'UCS-2'],
   group_uncommon: ['foo', '1', 'false', 'undefined', '[]', '{}'],
-  group_misc: ['', 'utf16le', 'usc2', 'hex', 'HEX', 'BINARY']
+  group_misc: ['', 'utf16le', 'hex', 'HEX', 'BINARY']
 };
 
 const inputs = [
   '',
   'utf8', 'utf-8', 'UTF-8',
   'UTF8', 'Utf8', 'uTf-8', 'utF-8',
   'ucs2', 'UCS2', 'UcS2',
-  'USC2', 'usc2', 'uSc2',
   'ucs-2', 'UCS-2', 'UcS-2',
-  'usc-2', 'USC-2', 'uSc-2',
   'utf16le', 'utf-16le', 'UTF-16LE', 'UTF16LE',
   'binary', 'BINARY', 'latin1', 'base64', 'BASE64',
   'hex', 'HEX', 'foo', '1', 'false', 'undefined', '[]', '{}'];

lib/internal/util.js

@@ -127,7 +127,6 @@ function slowCases(enc) {
       enc = `${enc}`.toLowerCase();
       if (enc === 'utf-8') return 'utf8';
       if (enc === 'ascii') return 'ascii';
-      if (enc === 'usc-2') return 'utf16le';
       if (enc === 'ucs-2') return 'utf16le';
       break;
     case 6:

test/parallel/test-internal-util-normalizeencoding.js

@@ -25,9 +25,6 @@ const tests = [
   ['utf-16le', 'utf16le'],
   ['UTF-16LE', 'utf16le'],
   ['UTF16LE', 'utf16le'],
-  ['usc-2', 'utf16le'],
-  ['USC-2', 'utf16le'],
-  ['uSc-2', 'utf16le'],
   ['binary', 'latin1'],
   ['BINARY', 'latin1'],
   ['latin1', 'latin1'],