Function isSyncIterable

lib/internal/streams/iter/from.js:71–76

* Check if value is a sync iterable (has Symbol.iterator). * @returns {boolean}

(value)

 * @returns {boolean}
 */
function isSyncIterable(value) {
  // We do not consider regular strings to be sync iterables in this context.
  // We don't care about boxed strings (String objects) since they are uncommon.
  return typeof value !== 'string' &&
      typeof value?.[SymbolIterator] === 'function';
}

/**
 * Check if value is an async iterable (has Symbol.asyncIterator).