sync mode on

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

@@ -0,0 +1,18 @@
+import * as fs from 'node:fs'
+import { once } from 'node:events'
+import { Transform } from 'node:stream'
+
+async function run (opts: {  destination?: fs.PathLike }): Promise<Transform> {
+  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
+}
+
+export default run