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import { Subscriber } from '../Subscriber'; import { iterator as Symbol_iterator } from '../symbol/iterator'; export const subscribeToIterable = <T>(iterable: Iterable<T>) => (subscriber: Subscriber<T>) => { const iterator = (iterable as any)[Symbol_iterator](); do { let item: IteratorResult<T>; try { item = iterator.next(); } catch (err) { subscriber.error(err); return subscriber; } if (item.done) { subscriber.complete(); break; } subscriber.next(item.value); if (subscriber.closed) { break; } } while (true); // Finalize the iterator if it happens to be a Generator if (typeof iterator.return === 'function') { subscriber.add(() => { if (iterator.return) { iterator.return(); } }); } return subscriber; };