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node_modules/pino/test/fixtures/transport-transform.js

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+'use strict'
+
+const build = require('pino-abstract-transport')
+const { pipeline, Transform } = require('node:stream')
+module.exports = (options) => {
+  return build(function (source) {
+    const myTransportStream = new Transform({
+      autoDestroy: true,
+      objectMode: true,
+      transform (chunk, enc, cb) {
+        chunk.service = 'pino'
+        this.push(JSON.stringify(chunk))
+        cb()
+      }
+    })
+    pipeline(source, myTransportStream, () => {})
+    return myTransportStream
+  }, {
+    enablePipelining: true
+  })
+}