N.B. Assuming `readLineStream` in that for await loop is node's readline object, the code is iterating over an asyncIterator[1] which works exactly as what you

N.B. Assuming `readLineStream` in that for await loop is node's readline object, the code is iterating over an asyncIterator[1] which works exactly as what you describe in your solution. (AsyncIterators have a next method that returns a Promise of the next item) [1] https://nodejs.org/api/readline.html#rlsymbolasynciterator https://nodejs.org/api/readline.html#rlsymbolasynciterator