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doc: fix stream example #33426

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doc: fix stream example #33426

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5 changes: 3 additions & 2 deletions doc/api/stream.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1666,14 +1666,15 @@ The `pipeline` API also supports async generators:

```js
const pipeline = util.promisify(stream.pipeline);
const fs = require('fs').promises;
const fs = require('fs');

async function run() {
await pipeline(
fs.createReadStream('lowercase.txt'),
async function* (source) {
source.setEncoding('utf8'); // Work with strings rather than `Buffer`s.
for await (const chunk of source) {
yield String(chunk).toUpperCase();
yield chunk.toUpperCase();
}
},
fs.createWriteStream('uppercase.txt')
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