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stream: Add option to `Readable.take` operator to not close the stream

nodejs/node#46980·122028·JavaScript·84 天未动·42 条评论·上游最近活跃 ·池内状态:可认领
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上游 issue 正文

### What is the problem this feature will solve? I will be able to do this: ```javascript const csvParsedStream = fs .createReadStream('file.csv') .compose(csvParse({ columns: false })); const [columns] = await csvParsedStream .take(1) .toArray(); // This will now be empty and no data as take already consumed the stream const parsed = await csvParsedStream .map((row) => parseRowByColumns(row, columns)) .toArray(); ``` Another example (I know I can use `[first, ...rest]` this is just an example): ```javascript const a = Readable.from([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]); const [first] = await a.take(1).toArray(); console.log(first); // [1] const rest = await a.toArray(); console.log(rest) // [] ``` ### What is the feature you are proposing to solve the problem? Adding `closeStream` option to the `take` operator that with default value `true` that I could disable closing the stream ```javascript const csvParsedStream = fs .createReadStream('file.csv') .compose(csvParse({ columns: false })); const [columns] = await csvParsedStream .take(1, { closeStream: false }) // Right now this would close the stream, but we give it an option to not .toArray(); const parsed = await csvParsedStream.map((row) => parseRowByColumns(row, columns)).toArray(); ``` ### What alternatives have you considered? Get the first value from stream as async itarator and rest ```javascript let columns; for await (const c of csvParsedStream.iterator<string[]>({ destroyOnReturn: false })) { columns = c; break; } const parsed = await csvParsedStream .map((row) => parseRowByColumns(row, columns)) .toArray(); ```
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stream: Add option to `Readable.take` operator to not close the stream · IdleToken