fs: return Buffer from mkdtemp when prefix is a Buffer

Author: hamidrezaghavami

lib/fs.js

@@ -3571,7 +3571,9 @@ function mkdtemp(prefix, options, callback) {
   if (h !== null && vfsResult(h.mkdtemp(prefix, typeof options === 'function' ? undefined : options), callback)) return;
 
   options = getOptions(options);
-
+  if (Buffer.isBuffer(prefix)) {
+    options.encoding = 'buffer';
+  }
   prefix = getValidatedPath(prefix, 'prefix');
   warnOnNonPortableTemplate(prefix);
 
@@ -3594,7 +3596,9 @@ function mkdtempSync(prefix, options) {
   }
 
   options = getOptions(options);
-
+  if (Buffer.isBuffer(prefix)) {
+    options.encoding = 'buffer';
+  }
   prefix = getValidatedPath(prefix, 'prefix');
   warnOnNonPortableTemplate(prefix);
   return binding.mkdtemp(prefix, options.encoding);
@@ -3610,7 +3614,9 @@ function mkdtempSync(prefix, options) {
  */
 function mkdtempDisposableSync(prefix, options) {
   options = getOptions(options);
-
+  if (Buffer.isBuffer(prefix)) {
+    options.encoding = 'buffer';
+  }
   prefix = getValidatedPath(prefix, 'prefix');
   warnOnNonPortableTemplate(prefix);
 

lib/internal/fs/promises.js

@@ -2024,9 +2024,10 @@ async function mkdtemp(prefix, options) {
     const promise = h.mkdtemp(prefix, options);
     if (promise !== undefined) return await promise;
   }
-
   options = getOptions(options);
-
+  if (Buffer.isBuffer(prefix)) {
+    options.encoding = 'buffer';
+  }
   prefix = getValidatedPath(prefix, 'prefix');
   warnOnNonPortableTemplate(prefix);
 
@@ -2039,7 +2040,9 @@ async function mkdtemp(prefix, options) {
 
 async function mkdtempDisposable(prefix, options) {
   options = getOptions(options);
-
+  if (Buffer.isBuffer(prefix)) {
+    options.encoding = 'buffer';
+  }
   prefix = getValidatedPath(prefix, 'prefix');
   warnOnNonPortableTemplate(prefix);