Function hasProtocol

lib/internal/streams/iter/utils.js:199–206

* Check if a value implements a Symbol-keyed protocol (has a function * at the given symbol key). * @param {unknown} value * @param {symbol} symbol * @returns {boolean}

(value, symbol)

 * @returns {boolean}
 */
function hasProtocol(value, symbol) {
  return (
    value !== null &&
    typeof value === 'object' &&
    symbol in value &&
    typeof value[symbol] === 'function'
  );
}

/**
 * Check if a value is PullOptions (object without transform or write property).