19 lines
504 B
Plaintext
19 lines
504 B
Plaintext
import * as fs from 'node:fs'
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import { once } from 'node:events'
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import { Transform } from 'node:stream'
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async function run (opts: { destination?: fs.PathLike }): Promise<Transform> {
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if (!opts.destination) throw new Error('kaboom')
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const stream = fs.createWriteStream(opts.destination)
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await once(stream, 'open')
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const t = new Transform({
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transform (chunk, enc, cb) {
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setImmediate(cb, null, chunk.toString().toUpperCase())
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}
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})
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t.pipe(stream)
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return t
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}
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export default run
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