fix: check if SharedArrayBuffer is supported

utils/buffer.js

@@ -1,26 +1,27 @@
 function view(buffer, shared = false) {
     if (buffer instanceof ArrayBuffer) return new Uint8Array(buffer);
-    if (shared && buffer instanceof SharedArrayBuffer) return new Uint8Array(buffer);
+    if (typeof SharedArrayBuffer !== 'undefined' && shared && buffer instanceof SharedArrayBuffer)
+        return new Uint8Array(buffer);
     if (ArrayBuffer.isView(buffer)) return new Uint8Array(buffer.buffer, buffer.byteOffset, buffer.byteLength);
-  
+
     throw new TypeError("The provided value is not of type '(ArrayBuffer or ArrayBufferView)'");
   }
-  
+
   function from_parts(buffers, shared = false) {
     let length = 0;
     let offset = 0;
     buffers.forEach(buffer => length += (null == buffer.byteLength ? buffer.length : buffer.byteLength));
-  
+
     const u8 = new Uint8Array(shared ? new SharedArrayBuffer(length) : length);
-  
+
     buffers.forEach(buffer => {
       const ref = Array.isArray(buffer) ? buffer : view(buffer, true);
-  
+
       u8.set(ref, offset);
       offset += ref.length;
     });
-  
+
     return u8;
   }
-  
-  module.exports = { view, from_parts };
+
+  module.exports = { view, from_parts };