lib: check SharedArrayBuffer existence in fast-utf8-stream

Author: codebytere

lib/internal/streams/fast-utf8-stream.js

@@ -49,7 +49,8 @@ const {
 const BUSY_WRITE_TIMEOUT = 100;
 const kEmptyBuffer = Buffer.allocUnsafe(0);
 
-const kNil = new Int32Array(new SharedArrayBuffer(4));
+const haveSAB = typeof SharedArrayBuffer !== 'undefined';
+const kNil = haveSAB ? new Int32Array(new SharedArrayBuffer(4)) : null;
 
 function sleep(ms) {
   // Also filters out NaN, non-number types, including empty strings, but allows bigints
@@ -61,8 +62,12 @@ function sleep(ms) {
     throw new ERR_INVALID_ARG_VALUE.RangeError('ms', ms,
                                                'must be a number greater than 0 and less than Infinity');
   }
-
-  AtomicsWait(kNil, 0, 0, Number(ms));
+  if (haveSAB) {
+    AtomicsWait(kNil, 0, 0, Number(ms));
+  } else {
+    const { sleep: _sleep } = internalBinding('util');
+    _sleep(ms);
+  }
 }
 
 // 16 KB. Don't write more than docker buffer size.