lib: fixup incorrect argument order in assertEncoding

PR-URL: https://github.com/nodejs/node/pull/57177
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

lib/internal/fs/utils.js

@@ -154,7 +154,7 @@ function lazyLoadFs() {
 function assertEncoding(encoding) {
   if (encoding && !Buffer.isEncoding(encoding)) {
     const reason = 'is invalid encoding';
-    throw new ERR_INVALID_ARG_VALUE(encoding, 'encoding', reason);
+    throw new ERR_INVALID_ARG_VALUE('encoding', encoding, reason);
   }
 }
 

test/parallel/test-fs-internal-assertencoding.js

@@ -0,0 +1,15 @@
+'use strict';
+
+// Tests to verify that a correctly formatted invalid encoding error
+// is thrown. Originally the internal assertEncoding utility was
+// reversing the arguments when constructing the ERR_INVALID_ARG_VALUE
+// error.
+
+require('../common');
+const { opendirSync } = require('node:fs');
+const { throws } = require('node:assert');
+
+throws(() => opendirSync('.', { encoding: 'no' }), {
+  code: 'ERR_INVALID_ARG_VALUE',
+  message: 'The argument \'encoding\' is invalid encoding. Received \'no\'',
+});