add hw2

node_modules/pino/test/fixtures/to-file-transport-with-transform.js

@@ -0,0 +1,20 @@
+'use strict'
+
+const fs = require('fs')
+const { once } = require('events')
+const { Transform } = require('stream')
+
+async function run (opts) {
+  if (!opts.destination) throw new Error('kaboom')
+  const stream = fs.createWriteStream(opts.destination)
+  await once(stream, 'open')
+  const t = new Transform({
+    transform (chunk, enc, cb) {
+      setImmediate(cb, null, chunk.toString().toUpperCase())
+    }
+  })
+  t.pipe(stream)
+  return t
+}
+
+module.exports = run