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node_modules/socket.io-parser/is-buffer.js

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+
+module.exports = isBuf;
+
+var withNativeBuffer = typeof Buffer === 'function' && typeof Buffer.isBuffer === 'function';
+var withNativeArrayBuffer = typeof ArrayBuffer === 'function';
+
+var isView = function (obj) {
+  return typeof ArrayBuffer.isView === 'function' ? ArrayBuffer.isView(obj) : (obj.buffer instanceof ArrayBuffer);
+};
+
+/**
+ * Returns true if obj is a buffer or an arraybuffer.
+ *
+ * @api private
+ */
+
+function isBuf(obj) {
+  return (withNativeBuffer && Buffer.isBuffer(obj)) ||
+          (withNativeArrayBuffer && (obj instanceof ArrayBuffer || isView(obj)));
+}