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

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)));
}