Function isBuffer

deps/undici/src/lib/core/util.js:549–552

* @param {*} buffer * @returns {buffer is Buffer}

(buffer)

 * @returns {buffer is Buffer}
 */
function isBuffer (buffer) {
  // See, https://github.com/mcollina/undici/pull/319
  return buffer instanceof Uint8Array || Buffer.isBuffer(buffer)
}

/**
 * Asserts that the handler object is a request handler.