fixup

lib/buffer.js

@@ -1082,7 +1082,8 @@ function _fill(buf, value, offset, end, encoding) {
 Buffer.prototype.write = function write(string, offset, length, encoding) {
   // Buffer#write(string);
   if (offset === undefined) {
-    // Do nothing
+    offset = 0;
+    length = this.length;
   // Buffer#write(string, encoding)
   } else if (length === undefined && typeof offset === 'string') {
     encoding = offset;
@@ -1108,16 +1109,19 @@ Buffer.prototype.write = function write(string, offset, length, encoding) {
   }
 
   const len = string.length;
-  if (len <= 16 && len <= length && (!encoding || encoding === 'ascii' || encoding === 'utf8')) {
+  if (
+    len <= 16 &&
+    len <= length &&
+    (!encoding || encoding === 'ascii' || encoding === 'utf8')
+  ) {
     let n = 0;
-    let pos = offset ?? 0;
     while (true) {
-      const code = StringPrototypeCharCodeAt(string, n);
+      const code = string.charCodeAt(n);
       if (code >= 128) {
         break;
       }
 
-      this[pos + n] = code;
+      this[offset + n] = code;
       n++;
 
       if (n === len) {